Toro Groundsmaster 4000-D Service Manual page 55

Problem
Four wheel drive will not engage.
Four wheel drive will not disengage.
No cutting units will operate.
One cutting unit will not operate.
All cutting decks operate slowly.
Cutting deck stops under load.
Cutting units will not raise.
Cutting units raise, but will not stay
up.
Groundsmaster 4000--D
Possible Causes
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve on 4WD hydraulic manifold is faulty.
Cartridge valve in 4WD manifold is damaged or sticking.
Rear axle motor is damaged.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve on 4WD hydraulic manifold is faulty.
Cartridge valve in 4WD manifold is damaged or sticking.
Electrical problem exists (see Chapter 5 -- Electrical System).
Gear pump or its coupler is damaged.
Electrical problem exists (see Chapter 5 -- Electrical System).
System pressure to the affected deck is low.
Key on affected deck motor is damaged.
Solenoid valve in deck manifold is faulty.
Cartridge valve in deck manifold is damaged or sticking.
Deck motor or gear pump section is damaged.
Engine RPM is low.
Deck motor or gear pump section is damaged.
Relief valve in deck manifold is by--passing.
Deck motor has internal leakage (by--passing oil).
Cutting deck gear pump section is inefficient.
Engine RPM is too low.
Hydraulic oil level in reservoir is low.
Lift cylinder(s) is (are) damaged.
Lift arm pivots are binding.
Relief valve in lift/lower control valve is stuck.
Pilot valve in lift/lower manifold is damaged or sticking.
Gear pump section for lift/lower control valve is inefficient.
Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Detents in lift/lower control valve are worn.
Rev. E
Page 4 - - 21 Hydraulic System (Rev. B)