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Rev. E
Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 21
Problem Possible Causes
Four wheel drive will not engage. 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.
Four wheel drive will not disengage. 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.
No cutting units will operate. Electrical problem exists (see Chapter 5 -- Electrical System).
Gear pump or its coupler is damaged.
One cutting unit will not operate. 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.
All cutting decks operate slowly. Engine RPM is low.
Deck motor or gear pump section is damaged.
Cutting deck stops under load. Relief valve in deck manifold is by--passing.
Deck motor has internal leakage (by--passing oil).
Cutting deck gear pump section is inefficient.
Cutting units will not raise. 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.
Cutting units raise, but will not stay
up.
Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Detents in lift/lower control valve are worn.
Hydraulic
System