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Husqvarna PT26D Workshop Manual

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PT26D
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  • Page 1 Workshop manual PT26D English...

  • Page 2: Table Of Contents

    Workshop manual for Husqvarna PT 26D Contents Valve block ............47 System components Manuals ......48 Contents ..............1 Sub-circuit function ........... 49 Introduction ............3 Cutting unit with suspension ......58 Ledger of changes ..........4 Safety Instructions ..........5 Repair Instructions ..........61 Removing and refitting the engine ....
  • Page 3 Replacing the hydraulic pump for the drive system .........114 Replacing the flushing valve ......115 Replacing valve block transmission ....116 Replacing valve block working hydraulics ..117 Replacing the hydraulic motor ......118 Replacing the control unit .......119 Replacing the lift cylinder ........120 Replacing the steering cylinder .......120 Hydraulic pressure for weight transfer ....121 Replacing the solenoid valve ......121...

  • Page 4: Introduction

    This book is intended to be an aid for those who work with servicing Husqvarna PT26 D. We assume that you have education equivalent to secondary vocational training for vehicle mechanics, occupational sector machines or cars.

  • Page 5: Ledger Of Changes

    LEDGER OF CHANGES Ledger of changes Enter changes and corrections in the workshop manual into the table below. Changes can be reported by Husqvarna AB as a service message or equivalent. Date Page Revision Signature English-4...

  • Page 6: Safety Instructions

    SAFETY INSTRUCTIONS Safety Instructions General Instructions This workshop manual is written for personnel with general knowledge about the repair and service of riders. The workshop where the rider is to be repaired must be equipped with safety equipment in accordance with local bylaws.
  • Page 7 SAFETY INSTRUCTIONS Use eye protection when working with the cutting unit. The belt tensioning spring can break, fly off, and could cause personal injury. Use eye protection when working with the battery with the plugs removed. Be especially careful when handling battery acid.

  • Page 8: Risk Of Sparking

    SAFETY INSTRUCTIONS Risk of sparking Sparking can occur when working with the battery and the thick cables in the starter motor circuit. This may cause the battery to explode, fire or eye injuries. Sparking in the circuit can not occur once the battery's power connection cable (usually the black negative cable) has been disconnected.

  • Page 9: Environment Protection

    SAFETY INSTRUCTIONS Environment protection Take care of the environment, there are numerous environmental risks especially when performing mainte- nance on the machine. This particularly applies when dealing with engine oil, hydraulic fluid, fuel, oil filters, hydraulic filters and fuel filters. You must be attentive to ensure spillage does not occur when you open a system that contains oil or fuel.

  • Page 10: Special Tools

    SPECIAL TOOLS Special Tools The machine is designed so that the number of special tools is kept to a minimum. The following special tools are used when working on the rider. Special tools for the engine and transmission are specified in resp. Workshop Manuals. Phillips Pozidrive Torx...

  • Page 11: Hydraulic Test Equipment

    SPECIAL TOOLS Hydraulic test equipment Manometer 1 x manometer 0-2.5 MPa (0-25 bar) 1 x manometer 0-25 MPa (0-250 bar) Alternatively, 1 x combination manometer with the above measuring ranges. The manometers should be equipped with a measuring coupling with appropriate quick coupling with thread M16x2 and 1 mm manometer hose Measuring nipple kit Tightening torque see “Hydraulic hoses, coupling nuts, T-pipe + 5%.

  • Page 12: Laser Tachometer

    SPECIAL TOOLS Laser tachometer Safety • Laser product class 1. • Exercise care when the laser beam is on. • Do not look straight at the beam. Do not aim the beam towards anyone else's eyes, either people or animals. •...
  • Page 13 SPECIAL TOOLS English-...

  • Page 14: Specifications

    SPECIFICATIONS Specifications Data PT26D Dimensions Dimensions Length, base machine 2,070 mm / 206.96 cm Width, base machine 1,150 mm / 114.91 cm Height Width, base machine 1,300 mm / 129.84 cm Width, base machine Operating weight, base machine Width, base machine 610 kg / 609.63 kg...
  • Page 15 SPECIFICATIONS Data PT26D Dimensions Cooling system Water cooled Volume approximately 5 litres Antifreeze fluid BS6580-1992, ASMD3306-89, AS2108-1977 Resistance analogue sensor at 20°C 0.9 - 1 Ohm Cooling fan power consumption at operating Appr. 12 A speed Electrical System Type 12 V, negative grounded...

  • Page 16: Control And Setting Values

    SPECIFICATIONS Data PT26D Dimensions Forwards, low speed 13 km/h Reverse, low speed 13 km/h Max inclination, all directions 10° Cutting unit Combi 155 Cutting width 1,550 mm / 61" Cutting heights 25.4-127 mm / 1"-5" Blade length 560 mm / 22"...

  • Page 17: Tightening Torques

    SPECIFICATIONS Tightening Torques Knife bolts, belt pulleys on the cutting unit 75-80 Nm Induction sensor (sensors) 30 Nm Muffler clamping screws 20 Nm Axle arm lift arm bearing 200 Nm Screws and nuts, general tightening torque with zinc plated threads + 5% Spanner size Allen key Thread...

  • Page 18: Delivery And Dealer Service

    DELIVERY AND DEALER SERVICE Delivery and Dealer Service After the First 25 Hours • Replace the hydraulic oil filter. Delivery Service • Change the engine oil and filter. Attach the cutting unit. • Check the tension and condition of the belts (generator and water pump belt, power-take- Adjust the cutting unit so that its rear edge is off belts, cutting unit belt).

  • Page 19: 500 Hour Service

    DELIVERY AND DEALER SERVICE 500 hour service Perform the 250-hour service. Change the belts (power take-off belts, cutting unit belt). Check the condition of the hydraulic hoses. Replace the fuel filter and check the hoses. Change the oil in the bevel gear. 1000 hour (alternative 2 year) service Perform the 500-hour service.

  • Page 20: Service Schedule

    DELIVERY AND DEALER SERVICE Service Schedule  = Described in this workshop manual. The following is a list of maintenance procedures that must be performed on the rider. Most of the  = Not described in this workshop manual or the points that are not described in this workshop operator’s manual.
  • Page 21 DELIVERY AND DEALER SERVICE Maintenance Page Daily main- Weekly Maintenance interval hours tenance main- 1000 2000 3000 tenance before after Check the condition of the battery, clean if necessary Check the oil level in the bevel gear, top up if necessary Check the wheel nuts Check the parking brake, adjust if necessary...
  • Page 22 DELIVERY AND DEALER SERVICE Maintenance and replacement are required more often in dusty conditions. With daily use, the machine shall be lubricated twice weekly. Performed by authorised service workshop.  = Described in this workshop manual.  = Not described in this workshop manual or the operator’s manual. ...

  • Page 23: Delivery Procedures

    DELIVERY AND DEALER SERVICE Delivery Procedures To our dealers In conjunction with the delivery, you shall also give A well performed pre delivery service is the first the customer the information required to handle step towards an active after-sales market. and maintain their machine in a safe manner.
  • Page 24 DELIVERY AND DEALER SERVICE 4. Checking oil levels See instructions under “Repair instructions \ Lubrication system and Hydraulic system”. 5. Check the air pressure in the tyres Checking the Tyre Pressure The tyre pressure must be 100 kPa / 1.0 bar / 14.5PSI for the front and rear wheels.
  • Page 25 DELIVERY AND DEALER SERVICE 11.Check the muffler fastening bolts Check that the muffler is fitted securely. Checking and retightening the screws after running the engine warm for the first time is recommended. Temperature variations and vibrations can mean that the tightening torque for the screws drops. The screws should be checked when servicing to guarantee the correct torque.

  • Page 26: Design And Function

    PT 26D, model year 2006 to 2008. • Traffic kit:Lighting with direction indicators, posi- Husqvarna PT is a Rider offering a very high tion light and rotating warning lamp. capacity. • Tool attachment, hydraulic valves, quick action The machine is equipped with Husqvarna’s...
  • Page 27 DESIGN AND FUNCTION Husqvarna PT 26D can be equipped with cutting unit, Combi 132 with a 132 cm cutting width or Combi 155 with a 155 cm cutting width. Cutting unit Combi 155 can be side shifted 8 cm (3 1/8") or mounted centrally in relation to the machine.

  • Page 28: Serial Number

    DESIGN AND FUNCTION Serial Number The serial number can be found on the printed plate attached to the right-hand side under the seat. The plate includes the follow- ing information: • Manufacturer • The machine’s type designation. • The manufacturer's type number. •...

  • Page 29: Engine

    DESIGN AND FUNCTION Engine Husqvarna PT26D is a Rider with a diesel engine from Perkins. The engine is a 3-cylinder, water cooled, in- line engine. Major engine repairs are not described in this workshop manual. This information can be found in the engine manufacturer’s own man- ual, which contains detailed information about adjusting and repairing the engine.

  • Page 30: Cooling System

    DESIGN AND FUNCTION Cooling system 1. Coolant pump 2. Drain plug 3. Thermostat housing 4. Cooling fan 5. Radiator 8043-187 Fuel system, components The engine is water cooled. Coolant is circu- lated by a pump, which is driven by a belt from the rear end of the crankshaft.
  • Page 31 DESIGN AND FUNCTION Coolant and antifreeze The cooling system must not be filled with salt water, this causes corrosion damage to the engine. Change the coolant if it is discoloured or dirty. The cooling system must then be thoroughly flushed. Coolant must be a mixture of 50% antifreeze fluid and 50% soft water.

  • Page 32: Fuel System

    DESIGN AND FUNCTION Fuel system 1. Fuel tank 2. Feed pump 3. Fuel filter 4. Hand pump 5. Injection pump 6. Injectors 8043-186 Fuel system, components The fuel system with injection pump has excellent operational reliability as long as the fuel is kept clean.

  • Page 33: Steering

    Fuel system Steering Husqvarna PT 26D is equipped with a hydraulic control system. A pump (8), located on the side of the engine behind the injection pump, provides the pressure supply. The pressure is adjusted by a pressure limiting valve in the control unit (4) under the steering wheel.

  • Page 34: Power Transmission

    DESIGN AND FUNCTION Power transmission The power transmission to the drive gear is hydrostatic. Also see the Sauer Danfoss manual under “System components Manuals” on page 48. A drive axle, connected to the engine's flywheel, is equipped with two elastic clutches that drive an axial piston pump (9) for the drive system.
  • Page 35 DESIGN AND FUNCTION Cutting unit drive The cutting unit is driven by two v-belts, a power take-off shaft and a propeller shaft from the engine. It is engaged by an electro magnetic clutch, which is located in front of the engine’s fly- wheel.

  • Page 36: Brakes

    DESIGN AND FUNCTION Brakes The machine’s hydrostatic drive system is used as the service brake. If you release the drive pedals they spring back to zero feed of the drive system's hydraulic pump and the machine stops. It is also possible to press down the pedal for the opposite driving direction.

  • Page 37: Electrical System

    DESIGN AND FUNCTION Electrical System Component Locations Headlight. Equipped with H4 halogen lamps and adjustable headlamp insert. Indicator panel. Indicates different functions on the machine. Control panel. Circuit board. Contains LEDs for trouble shooting. Circuit fuses. See the section “Fuses” on page 39. Starter.

  • Page 38: Circuits

    DESIGN AND FUNCTION Circuits The circuits for the electric system for PT26 are designed in a differently than for older machine types. On older machines it was possible to trace the path of the electric power along a line from the battery over the fuse, switch and relay connections to the consumer load.

  • Page 39: Circuit Board

    DESIGN AND FUNCTION Circuit board 8043-160 Circuit board, placement The circuit board is a central unit of the machine’s electrical system. The board and the control circuit are supplied via fuses FU3, FU12, located behind the battery. The electric system’s principle differs from con- ventional machines as all switches are supplied by the circuit board.

  • Page 40: Fuses

    DESIGN AND FUNCTION Fuses The machine’s electrical system is fuse pro- tected by three different types of fuse: Automatic fuses on the circuit board; These reset automatically after a short-circuit in the circuit. No corrective action required by the operator. High power melt fuses.
  • Page 41 DESIGN AND FUNCTION Safety System PT26D is equipped with a safety system that prevents starting or driving under the follow- ing conditions. The engine can only be started when the parking brake is on, and the drive pedals are unactuated.

  • Page 42: Built-In Test Equipment

    DESIGN AND FUNCTION Built-in test equipment The electrical system is equipped with BITE (Built In Test Equipment) in the form of LEDs on the circuit card and in the sensors. The LED on the circuit card for each circuit comes on when a function is activated. The circuit card diodes can emit the following signals: •...
  • Page 43 DESIGN AND FUNCTION The LED is located on the connection side of the sensors. The LED lights when the sensor is voltage fed and detects the target surface. IMPORTANT INFORMATION There is a risk of damage to the sensor if testing it with a test lamp.

  • Page 44: Hydraulic System

    DESIGN AND FUNCTION Hydraulic System Component locations and hydraulic diagrams 8043-108 Component locations Hydraulic system 1. Quick couplings, see diagram 6. Valve block transmission 11. Inlet strainer 2. Lifting cylinder 7. Wheel motors 12. Radiator 3. Control cylinder 8. Hydraulic pump Control and lift system 13.

  • Page 45: General

    DESIGN AND FUNCTION General The machine has two hydraulic pumps with a common hydraulic tank. The pump for work- ing hydraulics (8) is driven from the engine's timing gear and supplies system compo- nents, which require hydraulic pressure irre- spective of whether the machine is driven or stationary.

  • Page 46: Hydraulic Motor

    DESIGN AND FUNCTION Hydraulic motor 1. Outer track The hydraulic motor is an inverted gear motor. The valve disc and gearwheel unit are 2. Inner track located on two levels in the motor. Between these is a partition wall with drilled holes, where the oil can flow when they are not cov- ered by the oscillating rotor.

  • Page 47: Radiator

    DESIGN AND FUNCTION Radiator Hydraulic cooler, which is located at the front of the engine, is common with the radiator for 1. Engine cooler the engine’s cooling system. The left-hand 2. Hydraulic cooler side of the radiator (2) acts as the hydraulic cooler and the right-hand side (1) as the cool- ing system’s radiator.

  • Page 48: Valve Block

    DESIGN AND FUNCTION Valve block The machine has three valve blocks. Flushing valve The flushing valve (10) is included in the drive system and has the task of replacing the oil in the drive circuits so that the return oil from the motors is lead to the tank (14) via the cooler (12).

  • Page 49: System Components Manuals

    DESIGN AND FUNCTION Hydraulic Hygiene See the chapter hydraulic systems. System components Manuals Design and function or work on system components is not described in this manual. This information can be found in the manufacturer's own manuals, which contain detailed information about dismantling, assem- bling, special tools and spare parts.

  • Page 50: Sub-Circuit Function

    DESIGN AND FUNCTION Sub-circuit function 8043-108 Component Locations General All hydraulic oil, both to the working hydraulics and the hydraulics for the drive system come from the tank (14), with the inlet strainer (11) and via the gear pump for working hydraulics (8). This pump provides the control unit with a variable pressure depending on what task the machine is performing.
  • Page 51 DESIGN AND FUNCTION Working hydraulics Transport position 8043-227 Circuit diagram transport position The cutting unit is in suspended position during transport. The two valves (3+4) on the valve block, which regulate the pressure in the lifting cylinder, are closed. The hydraulic oil, which comes from the control unit, passes through a valve (2) on the valve block and the oil is piped to the hydraulic pump for the drive sys- tem.
  • Page 52 DESIGN AND FUNCTION Mowing position with weight transfer and floating position 8043-228 Circuit diagram weight transfer position By weight transfer is meant that the cutting unit’s lifting cylinder receives pressure of 1.8 MPa (18 bar) on the piston side, which lifts the cutting unit slightly from the very lowest position to a position so that the weight of the machine is distributed and more weight is on the front wheels.
  • Page 53 DESIGN AND FUNCTION Mowing position without weight transfer and with floating position 8043-229 Circuit diagram no weight transfer When weight transfer is not selected it means that there is no pressure on the lifting cylinder for the cutting unit. The valve (3), which lets through return oil from the lifting cylinder to the tank is open. The cutting unit has the weight on its wheels (swivel castors) and in floating position is level with the ground.
  • Page 54 DESIGN AND FUNCTION Lifting and lowering 8043-230 Circuit diagram Lifting Lifting increases the pressure from the gear pump to max. 12 MPa (120 bar) depending on the weight of the work equipment. This pressure flows to the valve block for working hydraulics and on to the lifting cylinder. Both valves (2+4) are opened to let through the flow to the lifting cylinder.
  • Page 55 DESIGN AND FUNCTION Hydraulic pump for drive system 8043-238 Circuit diagram hydraulic pump The hydraulic pump for the drive system alternates input and output depending on how the pump is set. The oil for the pump’s feed pressure is supplied by the gear pump (8), which sits on the engine. The pressure is regulated by the pressure limiting valve, which is located in the hydraulic pump for the drive system, to 1.8 MPa (18 bar) and the oil is piped as feed pressure to the pump’s suction side via one (of two) check valves.
  • Page 56 DESIGN AND FUNCTION Four-wheel drive without diff lock. F=Front axle R=Rear axle F=Flow distributor 8043-231 Circuit diagram four-wheel drive without diff lock Four-wheel drive means driving at low speeds. Front and rear wheel circuits are connected in parallel. The hydraulic pump’s flow is distributed both to the front wheel circuit and the rear wheel circuit, at which the wheel motors run on lower revs than during two-wheel drive.
  • Page 57 DESIGN AND FUNCTION Four-wheel drive diff lock F=Front axle R=Rear axle F=Flow distributor 8043-232 Circuit diagram Four-wheel drive with diff lock The differential lock works longitudinally by means of the front and rear wheels getting separate circuits. When the differential lock is activated, the valve (3) closes. The oil is forced through the flow distributor (f). The flow is distributed to the front wheel pairs and the rear wheel pairs as the flow distributor has different chokes for the front and rear wheel circuits.
  • Page 58 DESIGN AND FUNCTION Two-wheel drive F=Front axle R=Rear axle 8043-233 Circuit diagram Two-wheel drive Two-wheel drive involves driving in high gear. The entire hydraulic pump’s flow is distributed to the front cir- cuit, as a result of which the wheel motors operate at higher speed. A flow goes from the hydraulic pump for the drive system to the valve block for the transmission and out to the front axle and its wheel motors.

  • Page 59: Cutting Unit With Suspension

    The cutting unit’s drive is described under “Transmission”. Husqvarna PT 26D is equipped with a front mounted cutting unit to also mow in confined areas efficiently. The machine is supplied with cutting unit Combi 132 or Combi 155. Combi 155 can be side shifted approx- imately 8 cm (3.1/8") in relation to the machine.
  • Page 60 DESIGN AND FUNCTION 8043-139 Lift system The hydraulic lifting cylinder's (13) piston rod is connected to a lateral member (1), which has two forward facing lifting arms (4+5) with attachment arms (3). The cutting unit is suspended at the rear edge in the two attachment arms with link joints and pins.
  • Page 61 DESIGN AND FUNCTION The cutting unit’s belt, on the top of attach- ment cover, is a V-belt. The blades are not timed, they are mutual “collision proof”. Con- sequently they do not have shear pins. A heavy-duty spring with a tension wheel gives the belt the correct belt tension.

  • Page 62: Repair Instructions

    REPAIR INSTRUCTIONS Repair Instructions Removing and refitting the engine WARNING! Hot components, allow the engine to cool Remove the engine cover. IMPORTANT INFORMATION Hold the bolts so that the poles are not put under strain. 8009-779 Fastening bolts engine cover Release the cable connections.
  • Page 63 REPAIR INSTRUCTIONS 11. Remove the engine frame with the hydraulic tank, the fuel filter and battery shelf fitted. 12. Remove the driver's seat. 13. Remove the plate over the hydraulic pump's drive axle. 14. Make sure that the engine cannot start and remove the hydraulic pump's drive axle.
  • Page 64 REPAIR INSTRUCTIONS 22. Remove the bracket screws for the cable harness on the front of the engine. 23. Separate the fuel return line in the connector. 24. Release the electrical cables (two) from the starter. Cut the cable tie. 25. Release the cables to the engine tem- perature sensor and the temperature sensor on the thermostat housing.

  • Page 65: Cooling System

    REPAIR INSTRUCTIONS Cooling system 8043-203 Cooling system WARNING! Do not open the radiator cap quickly when the engine is hot, first release the overpressure with the cap partially unscrewed. Risk of burns. Use protective gloves and protective goggles. The antifreeze fluid and coolant are hazardous to health.
  • Page 66 REPAIR INSTRUCTIONS Cleaning the radiator’s heat exchanger Remove the radiator grille (69). If the dirt is mixed with oil, first spray cold degreasing agent and wait approximately 5 minutes. Then flush the radiator with water jets from the engine compartment. Contaminated oil, can be due to a leaking oil cooler.
  • Page 67 REPAIR INSTRUCTIONS 17. Fill with coolant. See the mixing table in the chapter “Specifications”. Run the engine and top up if necessary. 18. Check for leakage after running warm. Pressure testing the radiator The radiator must be disconnected from the remainder of the cooling system when testing at the pressure below.

  • Page 68: Lubrication System

    REPAIR INSTRUCTIONS Lubrication system Checking the oil level Check the oil level in the engine when the machine is standing horizontally with the engine switched off. Remove the dipstick and wipe it clean. Then insert the dipstick again. Take the dipstick out again and read the oil level. The oil level should be between the markings 8009-793 on the dipstick.
  • Page 69 REPAIR INSTRUCTIONS Replacing the engine’s oil filter WARNING! Risk of spray and burn injuries. The engine’s oil filter may be very hot immediately after stopping. Allow the engine to cool somewhat first. IMPORTANT INFORMATION Replaced filters must be deposited with 8009-801 Engine oil filter assigned places for correct disposal.

  • Page 70: Auxiliary System

    REPAIR INSTRUCTIONS Auxiliary system Adjusting the pump and alternator drive belts Slacken off the adjustment screw 1/2 turn. Pry out the alternator using a screwdriver or similar until the belt can be pressed in approximately 1 cm (3/8") with moderate thumb pressure between the pump and alternator.

  • Page 71: Fuel And Intake System

    REPAIR INSTRUCTIONS Fuel and intake system Removing and refitting thefuel tank Remove the driver’s seat. If the fuel level in the tank is higher than the suction line: Clamp together the suction line (16) with self-locking pliers or a hand vice. Release the suction line from the feed pump and plug it with a 10 mm plug or bolt.
  • Page 72 REPAIR INSTRUCTIONS Replacing the Fuel Filter IMPORTANT INFORMATION All action taken in the fuel system requires utmost cleanliness to prevent damaging the injection pump. Damage caused by poor hygiene is not covered by the warranty. IMPORTANT INFORMATION Replaced filters must be deposited is assigned places for correct disposal.
  • Page 73 REPAIR INSTRUCTIONS Emptying the particle trap Compress so that the rubber tabs open and any particles can drop out. Cleaning the cyclone filter Remove the cover (52) held in position by two brace locks and clean the inside of the cover.

  • Page 74: Chassis

    REPAIR INSTRUCTIONS Chassis Checking and adjusting the throttle control Check that the engine responds to throttle increases and that a good engine speed is attained at full throttle. Front stop screw for max speed is sealed. Breaking the seal can invalidate the engine warranty.
  • Page 75 REPAIR INSTRUCTIONS Adjusting the steering rod The steering rod is adjusted so that the hydraulic pump reaches its stop position for forward driving at the same time as the for- ward pedal reaches its stop position. This provides maximum speed for forward driving. Before the steering rod is adjusted, the pump’s neutral position must be correctly set, see above.

  • Page 76: Steering Console

    REPAIR INSTRUCTIONS Steering console 8043-193 Steering console Lock Remove the plastic cover (46). Remove the spring (16) and the lock’s spring (newer version) Keep track of the spring (15) (older ver- sion) and remove the screws (10). The spacers (11) are released. Remove the lock backwards.

  • Page 77: Dismantling The Rear Axle

    REPAIR INSTRUCTIONS Dismantling the rear axle 8043-200 Rear axle attachment Jack up and block the machine under the frame. Remove the rear wheels. Place a container under the valve block transmission. Clean according to the general instruc- tions. Drain the hydraulic tank if sealing plugs 8043-132 for the hydraulic lines are not available.

  • Page 78: Assembling The Rear Axle

    REPAIR INSTRUCTIONS Assembling the rear axle Guide the hydraulic hoses into position and lift the rear axle (22) onto the rear frame (12). Lubricate the pendulum shaft (19)with molybdenum disulphide grease and assemble it. Tightening torque according to the table. Connect the hydraulic hoses according to the markings.

  • Page 79: Replacing The Parking Brake Pedal

    REPAIR INSTRUCTIONS Check that the steering stop in front of the lower bearing is secured. Assemble in reverse order. Lubricate the bearing seatings and studs with corro- sion inhibiting grease or copper-based lubricant. Tightening torque according to the table. Replacing the parking brake pedal 8043-198, -199 Parking brake model year 2007- 2008 Remove the floor plate.

  • Page 80: Replacing The Parking Brake Lock Cable

    REPAIR INSTRUCTIONS Replacing the parking brake lock cable Model year 2007 - 2008 Remove the parking brake lock cable and unhook the cable from the lock. Remove the cable handle. Remove the upper nut and pull the wire downwards. Older machines lack star washers. 506 48 87-01, whose task is to prevent the cable from rotating when the upper nut is 11mm...

  • Page 81: Adjusting The Parking Brake

    REPAIR INSTRUCTIONS Adjusting the parking brake WARNING! A poorly adjusted parking brake can result in reduced braking ability. 1. Raise the machine so that the wheels rotate freely. 2. When the parking brake has been released, check that partial braking of the front wheels does not occur.

  • Page 82: Power Transmission

    REPAIR INSTRUCTIONS Power transmission WARNING! Prevent the engine from starting when working on moving parts. Take into account the risk of the engine starting unintentionally Bleeding the drive system See the chapter hydraulic systems. Maintenance of the transmission The machine is designed for a minimum of maintenance.
  • Page 83 REPAIR INSTRUCTIONS Replacing the solenoid clutch Remove the driver's seat and the fuel tank. Remove the plate over the hydraulic pump's drive axle. Ensure that the engine cannot start. Remove the bolts (101+106) to the front clutch for the hydraulic pump's drive axle and spacer ring (102).
  • Page 84 REPAIR INSTRUCTIONS 21. Assemble the front drive disc. Align in the keyway and tighten the centre bolt as set out in the table. 22. Connect the power cable and tie it up using a cable tie so it cannot rub against the flywheel or other rotating parts.
  • Page 85 REPAIR INSTRUCTIONS Replacing the power take-off belts Always replace the belts in pairs. Remove the driver’s seat. Remove the protective cover above the hydraulic pump's drive shaft. Secure the injection pump stop arm backward in position for engine stopping. Release the drive shaft from the hydrau- 8009-885 lic pump and remove the spacer Stop arm...

  • Page 86: Power Take-Off Shaft

    REPAIR INSTRUCTIONS Lubricate the belt tensioner’s axle bush- ing with corrosion inhibiting grease or copper-based lubricant and thread it in the belt tensioner. Assemble in reverse order. Tightening torque for screws as set out in the table. power take-off shaft Remove the propeller shaft for the angle gear.

  • Page 87: Assembling Accessories

    Accessories hydraulic kit See “Assembly instruction Equipment kit” publikation 115 03 33-01, accompanying the assembly kit in a language-free version. Accessories traffic kit See “Assembly instruction Road kit, PT26D” publikation 115 03 32-01, accompanying the assembly kit in a language-free version. English-...

  • Page 88: Cutting Unit With Suspension

    REPAIR INSTRUCTIONS Cutting unit with suspension Cutting unit suspension, see figure on page 89. WARNING! Prevent the engine from starting when working on moving parts. Attaching and removing the cutting unit WARNING! Exercise caution. Risk of crush injuries Wear protective gloves See “Side shifting the cutting unit”.
  • Page 89 REPAIR INSTRUCTIONS Remove the screws for the bearing brackets. Remove the adjustment screw for tilt angle from its mounting. TIP! Measure where the lock nut is located on the adjustment screw. 10. Remove the damper from the unit cover. 11. Screw in the adjustment screw for tilt angle into the new attachment a few turns.
  • Page 90 REPAIR INSTRUCTIONS Replacing the lifting arms and bushings in the lifting system 8043-139 Lift system Remove the cutting unit, see “Side shift- ing the cutting unit” on page 87. Remove the floor plate. Remove the front wheels. Remove a circlip (15), knock out the axle (14) and release the lifting cylinder from the member.

  • Page 91: The Cutting Unit's Service Position

    REPAIR INSTRUCTIONS The Cutting Unit’s Service Position In order to provide good accessibility for cleaning, repair and servicing, the unit can be set in the service position. The service posi- tion means that the unit is raised and locked in the vertical position. Placing in the Service Position The cutting unit must be in the lowered position and the engine off.

  • Page 92: Adjustments Cutting Unit

    REPAIR INSTRUCTIONS Adjustments cutting unit Setting the cutting height and tilt angle When a new cutting unit is attached, you need to adjust the tilt angle and cutting height. Adjustment must be made in the stated order. Starting position: • Check the tyre pressures 100 kPa / 8043-046 Cutting height setting, front...
  • Page 93 REPAIR INSTRUCTIONS Ground pressure The ground pressure is adjusted hydraulically in the “floating position” through the feed pressure for the drive system's pump acting on the lifting cylinder. With weight transfer engaged, a lower ground pressure is achieved on the unit’s pivot wheels and increased ground pressure on the machine’s front wheels.
  • Page 94 REPAIR INSTRUCTIONS 8043-197 Cutting unit Combi 155 English-...

  • Page 95: Blade Drive And Bearings

    REPAIR INSTRUCTIONS Blade drive and bearings Replacing the angle gear Dismantle the cutting unit. See “Side shifting the cutting unit” on page 87. Remove the screws for the covers. Lift off the protective covers from over the belts. Pry off the belt from the belt pulleys. Use a jimmy bar, if necessary, in order to release the belt tension.

  • Page 96: Replacing The Cutting Unit Belt

    REPAIR INSTRUCTIONS Replacing the cutting unit belt WARNING! Protect your hands with gloves when working with the blades. There is a risk of crush injuries when working with the belt. On these cutting units with “collision-proof” blades, the blades are driven by one V-belt. Do as follows to replace the V-belt: 8009-880 Dismantle the cutting unit.
  • Page 97 REPAIR INSTRUCTIONS Remove the nuts, which hold the bearing housing in position, from the top of the cover. Make sure that the unit is posi- tioned with the belt pulley against the unit’s cover. Place a wooden block under the unit cover so that the blade is free from the supporting surface.

  • Page 98: Sharpening And Balancing The Blades

    REPAIR INSTRUCTIONS An oil filter wrench, for example, can be used to hold the pulley in place when the screw is tightened. Sharpening and balancing the blades WARNING! Protect your hands with gloves 8043-181 when working with the blades. Counterhold Remove the blades as described in the previous section.

  • Page 99: Swivel Castor Bearing

    REPAIR INSTRUCTIONS Swivel castor bearing Remove the screw (9) and washer (8). Remove the fork (7). Replace the bushings (5) if necessary. Assemble in reverse order. Tightening torque according to the table. Lubricate with lubricant spray and check that grease penetrates to the upper and lower bearing.

  • Page 100: Electrical System

    REPAIR INSTRUCTIONS Electrical system Generator Checking the alternator See Perkins Manual \ Electrical System \ Alternator – Test. Replacing the alternator Release a battery cable. Release the power cables from the alter- nator. Loosen the alternator fastening bolts approximately one turn. Press in the alternator and pry off the pump and alter- nator belt.
  • Page 101 REPAIR INSTRUCTIONS IMPORTANT INFORMATION The circuit board must not be subjected to breaking or bending strain 10. Carefully remove the circuit board. 11. If necessary, move over the strapping on the rear of the circuit board to the new circuit board. 12.

  • Page 102: Switch, Fuses

    FU12 is tested in the same way as FU13 with a voltmeter. Safety System PT26D is equipped with a safety system that prevents starting or driving under the follow- ing conditions. The engine can only be started when the parking brake is applied and the drive pedals are unactuated.
  • Page 103 REPAIR INSTRUCTIONS Replacing the switch for driver’s seat Pull apart the connector under the driver's seat and release the shock absorber from the chassis. Remove the driver’s seat. Remove the seat cushion from the underframe. Remove the switch from the seat cushion.

  • Page 104: Lights

    REPAIR INSTRUCTIONS Lights Replacing the headlight bulb Applies to the headlight lamp. For information about the bulb type, see “Technical data”. IMPORTANT INFORMATION When the plastic covers are removed, the unit with warning lamps is released. Do not damage it. Remove the plastic covers (41+43) around the steering wheel console.

  • Page 105: Starting With A Weak Battery

    REPAIR INSTRUCTIONS Starting with a weak battery If the battery is not fully charged there is a risk that the starter will not be activated automati- cally after glow plug heating. If this is the case, try after a period of glow plug heating to switch to start without glow plug heating by turning the key to ON and then to START.

  • Page 106: Transient Protection Diode

    REPAIR INSTRUCTIONS Transient protection diode There is a transient voltage suppression diode on model year 2008. It protects the electric system against induced line surges, which may arise when the relay switches on or off. The diode is connected between the main power relay and chassis.
  • Page 107 REPAIR INSTRUCTIONS English-...

  • Page 108: Hydraulic System

    REPAIR INSTRUCTIONS Hydraulic System • Dirt particles that enter the system include: Hydraulic Hygiene - Contaminants entering when topping up with oil. Keep the hydraulic system clean. Remember to: - Dust particles from the workshop. • Thoroughly clean before the top-up cap is - Gasket and thread sealants from assembly.

  • Page 109: Keep The Hydraulic Oil Clean

    REPAIR INSTRUCTIONS Keep the hydraulic oil clean Working Methods Dirt and contaminants are the greatest enemies of Cleanliness also applies to components that have a hydraulic system. Moreover, long work sessions been removed or are to be installed. Keep in mind at high power are very dependent on whether the that a replaced component should probably be hydraulic oil has been able to retain its condition.

  • Page 110: Hydraulic System Pt26

    Changing hydraulic oil Viscosity and quality Hydraulic oil ISO VG. Viscosity 46 cSt. Consult Husqvarna AB concerning local envi- ronmental provisions regarding types of oil, before types of oil other than those stated by Husqvarna are used. Inspectionof the oil level Open the right-hand engine cover and remove the filler cap.

  • Page 111: Replacing Hydraulic Filter And Screens

    REPAIR INSTRUCTIONS Filling up hydraulic oil Filling hydraulic oil Fill to approx. 60 mm (2,1/4”) below the strainer’s upper edge with hydraulic oil. IMPORTANT INFORMATION Used hydraulic oil is a health hazard and must not be disposed of in the ground or in nature.

  • Page 112: Hydraulic Connections And Hoses

    REPAIR INSTRUCTIONS Hydraulic filter (106) Filling hydraulic oil Clean the top of the tank as set out in the general instructions. Remove the cover on the filter holder (46). Remove the old filter cartridge. Clean the inside of the filter holder. Assemble in reverse order.
  • Page 113 REPAIR INSTRUCTIONS 8043-206 Hydraulic system figure 1 English-...
  • Page 114 REPAIR INSTRUCTIONS 8043-207 Hydraulic system figure 2 English-...

  • Page 115: Replacing The Hydraulic Pump For The Drive System

    REPAIR INSTRUCTIONS Replacing the hydraulic pump for the drive system Drain the hydraulic tank. Treat the oil as waste oil. Remove the driver’s seat, the fuel tank and the plate over the hydraulic pump's drive axle. Ensure that the engine cannot start. Remove the bolts to the front clutch for the drive axle and spacer ring.

  • Page 116: Replacing The Flushing Valve

    REPAIR INSTRUCTIONS 18. Tighten the fastening bolts on the sensor holder. 19. Assemble the shock absorber on the hydraulic pump's operating lever. 20. Assemble the hydrostatic control on the hydraulic pump's operating lever. 21. Assemble the sensor for the hydrostatic control. Default setting 2-3 mm gap to the target.

  • Page 117: Replacing Valve Block Transmission

    REPAIR INSTRUCTIONS Connections can be interchanged. Mark the hydraulic hoses so that they are reassembled on the correct connections. Release the hydraulic lines from the valve block. Fit protective plugs. Remove the valve block’s mounting bolts. Assemble in reverse order. Tightening Torques for hydraulic lines as set out in the table.

  • Page 118: Replacing Valve Block Working Hydraulics

    REPAIR INSTRUCTIONS Connections can be interchanged. Mark the hydraulic hoses so that they are reassembled on the correct connections. Release the hydraulic lines from the valve block. Fit protective plugs. Remove the valve block's mounting bolts. Assemble in reverse order. Tightening Torques for hydraulic lines as set out in the table.

  • Page 119: Replacing The Hydraulic Motor

    REPAIR INSTRUCTIONS Dismantling and reassembly Remove the double solenoid valve if it is fitted. If not, remove its cover plate. Four O-rings are released. Remove the electric part from the sole- noid valves by removing the plastic nut, after which the electric part can be lifted off from the cartridge valve.

  • Page 120: Replacing The Control Unit

    REPAIR INSTRUCTIONS 10. If necessary, move over parts to the new hydraulic motor. 11. Assemble the hydraulic motor in the reverse order. Tightening torque for the fastening bolts and hydraulic connec- tions as set out in the table. 12. Fill with hydraulic oil. 13.

  • Page 121: Replacing The Lift Cylinder

    REPAIR INSTRUCTIONS Replacing the lift cylinder Open the cover on the chequered floor plate. Remove a circlip and knock out the axle for the front mounting. Jack up and block the machine Place a container under the cylinder to collect the waste oil. Clean according to the general instructions.

  • Page 122: Hydraulic Pressure For Weight Transfer

    REPAIR INSTRUCTIONS Hydraulic pressure for weight transfer The hydraulic pressure is not adjustable, it is Hydraulic pump controlled by the feed pressure from the drive system’s hydraulic pump. If this is incorrect, clean or replace the pressure limiting valve, which is located underneath the hydraulic pump.
  • Page 123 REPAIR INSTRUCTIONS English-...

  • Page 124: Trouble Shooting

    TROUBLE SHOOTING Trouble shooting General The main rule for all trouble shooting is to work methodically. Note what you do and any observations from the beginning of the work. This is something that is often neglected. The notes are valuable, partly if you want to check what you have done –...

  • Page 125: Electrical System

    TROUBLE SHOOTING Electrical System For your assistance, there is “Fuses” on page 39, “Connectors on the circuit card” on page 158 and its placement on page 157 and circuit diagrams 1 to 11 in chapter appendixes. BITE The machine also has integrated test equipment with LEDs on the circuit board and in the sensors. The test function of the LEDsTable on page 128, and their placement on the circuit board is shown on page 157.
  • Page 126 TROUBLE SHOOTING Voltage measurement If the engine does not run, there is only voltage to the solenoid valves for approximately 3 seconds after the ignition has been switched to the ON position. This limitation can be bypassed by disconnecting the connector from the engine's oil pressure switch.
  • Page 127 TROUBLE SHOOTING A breakage on the cable between J1 and the analogue sensor on the thermostat housing results in theemergency glow plug heating function activating with a fixed heating time. Caution: only with an open circuit, if there is another fault on the sensor so that glow plug heating does not work the connector can be disconnected from the sensor and run with this emergency glow plug heating time.
  • Page 128 TROUBLE SHOOTING Main power relay The battery disconnector (Main power relay) receives its voltage via an miniature circuit- breaker of 1 A on the circuit board. If the cur- rent out to the relay exceeds this current, the voltage is automatically disconnected. Dis- connect J35 (and the oil pressure switch) and turn the ignition key to the ON position.
  • Page 129 TROUBLE SHOOTING Trouble shooting table LEDs LEDs When the LED Function is on Valve 1 = accessory. Voltage out. Green LD14 Short circuit, probably on the cabling or in valve 1. LD1 and LD14 Green and Red Open circuit, probably the conductor to the valve 1 or the nega- tive conductor to the valve 1 or in the valve coil.
  • Page 130 TROUBLE SHOOTING Electrical connection, start of cutting unit (P.T.O). Fault LD8 Green Voltage out. LD19 Short circuit, probably on the cabling or in the electrical connec- LD8 and LD19 Green and Red tion. Open circuit, it electrical connection or on the negative conduc- tor out to the electrical connection.
  • Page 131 TROUBLE SHOOTING Fan, voltage = fan activated. LD27 Green Voltage out, if the LED does not light on activation of the fan there may be a short-circuit as this circuit has no red LED to indicate a short circuit. The circuit is short-circuit protected, in the event of a short-circuit the green LED does not comes on.

  • Page 132: Hydraulic System

    TROUBLE SHOOTING Hydraulic System Hydraulic diagram is available as Appendix “Hydraulic diagram” on page 161. In many cases the hydraulic system is controlled by the electrical system. In other cases the system is con- trolled mechanically. First make sure that the components in the system receive the correct and control commands.
  • Page 133 TROUBLE SHOOTING Trouble shooting with pressure and flow measurement IMPORTANT INFORMATION Stated pressures are nominal values. Certain ENVIRONMENTAL HAZARD! Avoid spill- deviations as a result of temperature, viscos- age during hydraulic measurements. ity and friction are normal. The guideline val- Waste oil shall be treated as environmen- ues stated are meant to give an idea of tally hazardous and turned in to the work-...
  • Page 134 TROUBLE SHOOTING Excess flow valve in steering unit Connect manometer 0-15 MPa (0-150 bar) to test socket P2 on the conductor at the outlet of the bearing pump. Disconnect the hose (T) from the T-coupling nearest to the vehicle centre behind the park- ing brake lock.
  • Page 135 TROUBLE SHOOTING Flow test flushing valve The flow Q2 is dependent on the opening pressure for the flushing valve’s pressure lim- iting valve. Measuring Q2 provides the flow for the transmission oil in the drive wheel cir- cuit from the flushing valve. This is an impor- tant test when suspecting that the hydraulic system is running too hot.
  • Page 136 TROUBLE SHOOTING Function table solenoid valve Valve block transmission Model Valve Function Voltage High speed 2WD Right (2) Circulation 12 V rear axle High speed 2 WD Left (3) None Low speed 4WD Right (2) Open to rear axle Low speed 4WD Left (3) Flow to wheel...

  • Page 137: Fuel System

    Air in Fuel – Test. The suction line between the tank and the feed pump is the only fault source on the Husqvarna side of the interface, that can be the subject of trouble shooting actions. Check especially that partial air cannot leak in.
  • Page 138 The engine will not start.
  • Page 139 Engine starts but does not run satisfactorily...
  • Page 140 The motor runs normally, low /no power...
  • Page 141 Low power, abnormal noise...
  • Page 142 Transmission: Overheating, other indications...
  • Page 143 Cutting unit does not work...
  • Page 144 Uneven mowing result, vibrations...

  • Page 146: Circuit Diagram

    APPENDIXES Circuit diagram Circuit diagram 1 English-...
  • Page 147 APPENDIXES Circuit diagram 2 English-...
  • Page 148 APPENDIXES Circuit diagram 3 English-...
  • Page 149 APPENDIXES Circuit diagram 4 English-...
  • Page 150 APPENDIXES Circuit diagram 5 English-...
  • Page 151 APPENDIXES Circuit diagram 6 English-...
  • Page 152 APPENDIXES Circuit diagram 7 English-...
  • Page 153 APPENDIXES Circuit diagram 8 English-...
  • Page 154 APPENDIXES Circuit diagram 9 English-...
  • Page 155 APPENDIXES Circuit diagram 10 English-...
  • Page 156 APPENDIXES Circuit diagram 11 English-...
  • Page 157 APPENDIXES English-...

  • Page 158: Circuit Board

    APPENDIXES Circuit board Green LED indicates voltage out. Red LED indicates a short circuit Red+green LEDs indicate a power failure on the function. 8043-162 Placement of circuit card connections, melt fuses and LEDs English-...
  • Page 159 APPENDIXES Connectors on the circuit card J1: Connection for the analogue engine temperature sensor. (ANALOGUE TEMP SENSOR) / Cable harness 544 32 22-01 Black wires. J2: Connection for the temperature switch, max. temp. (MAX TEMP SWITCH) / Cable harness 544 32 22-01 Yellow wires.
  • Page 160 APPENDIXES J30: Connection for the horn. (HORN) (Traffic kit) / Cable harness 544 88 76-01 Brown + blue wires. J31: Connection for the switch to signal (HORN SWITCH). 544 31 26-01 J32: Connection for +12 volt in to the circuit card. Pins 1, 2 and 3 lead in +12V. Pins 5 and 6 are negative in to the card (12V POWER IN) / Cable harness 544 36 98-01.
  • Page 161 APPENDIXES 8043-160 Circuit board, placement English-...

  • Page 162: Hydraulic Diagram

    APPENDIXES Hydraulic diagram 8043-247 Hydraulic diagram English-...
  • Page 163 APPENDIXES English-...

  • Page 164: Index A

    KEYWORD REGISTER 33, 140 Index A Differential Lock Drain plug Drive axle Abnormal exhaust noise Abnormal noise from the cutting unit 14, 36 Electrical system Abnormal noise from the transmission Emergency glow plug heating Accessories 13, 28, 61 Engine Adapter ferrules Engine cooler Air filter Engine Oil...
  • Page 165 KEYWORD REGISTER Hydraulic motor, replacement Oil level hydraulic tank 36, 126 Hydraulic oil changing Oil pressure sensor Hydraulic Oils Old oil filters Hydraulic pump Open ring spanner Hydraulic pump drive system Hydraulic pump working hydraulics Parallelism Hydraulic System 35, 80 Parking brake Hydraulic tank 35, 78...
  • Page 166 KEYWORD REGISTER Steering cylinder, replacement Switch Chronometer Starter switch Swivel castor bearing 59, 98 Swivel castors Test socket The cutting unit's belt The engine runs erratically The engine will not start. Thread system Throttle control 16, 102 Tightening Torques Tilt angle Parallelism Torx Traffic kit: Transmission...
  • Page 167 115 08 30-26 2009W18...

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