Toro 30411 - Page 63

Rev. E
Groundsmaster 4100--D Hydraulic SystemPage 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.
Cutting decks will not operate. Electrical problem exists (see Chapter 5 -- Electrical System).
Gear pump or it’s coupler is damaged.
One cutting deck motor will not oper-
ate.
Electrical problem exists (see Chapter 5 -- Electrical System).
System pressure to the affected motor is low.
Key on affected deck motor is damaged (motor rotates but deck
blades don’t rotate).
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 deck motors 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 deck will not raise. Engine RPM is too low.
Hydraulic oil level in reservoir is low.
Lift arm pivots are binding.
Lift cylinder is damaged.
Relief valve in lift/lower control valve is stuck.
Pilot valve in lift/lower manifold is damaged or sticking.
Proportional flow divider in gear pump is faulty.
Gear pump section for lift/lower control valve is inefficient.
Cutting deck raises, 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