Toro LT-F3000 Operator's Manual page 56

Problem
There is excessive noise in the hydraulic
system.
After an initial period of satisfactory
operation, the machine loses power.
A flail rotor 'knocks' while rotating.
One flail rotor rotates slowly.
A cutting unit fails to lift out of work.
The cutting units do not follow the contours
of the ground.
Possible Cause
1. A pump is malfunctioning.
2. A motor is malfunctioning.
3. Air is leaking into the system.
4. A suction strainer is blocked or
damaged.
5. The oil has excessive viscosity due to
cold conditions.
6. The relief valve setting is low.
7. The hydraulic-fluid level is low.
1. A pump or motor is worn.
2. The hydraulic-fluid level is low.
3. The oil in the hydraulic system has the
wrong viscosity.
4. The oil-filter element is blocked.
5. The pressure relief valve is
malfunctioning.
6. The system is overheating.
7. There are leaks on the suction hose.
1. The flail-rotor bearings are worn.
1. A flail-rotor bearing is seized.
2. A motor with incorrect rotation was
installed.
3. The motor integral valves are not
working correctly.
4. The motor is worn.
1. There is a lift cylinder seal failure.
2. The pressure relief valve is jammed
open or set wrong.
3. There is a malfunctioning control valve.
4. There is mechanical blockage.
1. The hose routing or the orientation of
the hydraulic fittings is incorrect.
2. The pivot points are too tight.
3. The mower is being operated in the
'hold' position.
4. The weight transfer is set too high.
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Corrective Action
1. Identify the noisy pump and service or
replace it.
2. Identify the noisy motor and service or
replace it.
3. Tighten or replace the hydraulic fittings,
particularly in the suction lines.
4. Clean and replace the suction strainer
or renew it as necessary.
5. Allow the system to warm up.
6. Have the relief valve pressure checked.
Consult your authorized distributor.
7. Fill the hydraulic-fluid reservoir to the
correct level.
1. Replace parts as necessary.
2. Fill hydraulicfluid tank to correct level.
3. Replace the oil in the hydraulic tank
with the correct viscosity-grade oil;
refer to the Specifications section.
4. Change the filter element.
5. Have the relief valve cleaned and
pressure checked. Consult your
authorized distributor.
6. Reduce the work rate (increase the
height of cut or reduce the forward
speed).
7. Check and tighten the fittings. Replace
the hose if necessary.
1. Replace the bearings as necessary.
1. Replace the bearings as necessary.
2. Check the motor and replace it if
necessary.
3. Have the valves cleaned and checked.
4. Replace the motor.
1. Replace the seals.
2. Have the relief valve pressure checked.
Consult your authorized distributor.
3. Overhaul the control valve.
4. Remove the blockage.
1. Move the cutting units throughout the
extremes of movement and observe
any tightness in the hoses. Correctly
route the hoses and orientate the
fittings as necessary.
2. Release and grease the pivot point as
necessary.
3. Move the position-control switch to
'down / float' position.
4. Reduce the weight transfer.