Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 36
Lift Circuit Problems
Problem Possible Cause
Cutting decks will not raise.
NOTE: Seat must be occupied in or-
der to raise cutting decks.
Engine RPM is too low.
Hydraulic oil level in reservoir is low (NOTE: Other hydraulic systems
are affected as well).
Solenoid valve (S1) in combination manifold is faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Lift arm pivots are binding.
Lift/lower relief valve in combination manifold is stuck.
Lift cylinder(s) is (are) damaged.
Gear pump section for lift circuit is worn or damaged (NOTE: A worn
or damaged gear pump section will also affect the steering, engine
cooling fan motor and traction charge circuits).
Cutting decks raise, but will not stay
up.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. A cutting
deck will eventually lower if left in the
raised position during storage.
Lift circuit hydraulic lines or fittings are leaking.
Combination manifold cartridge valve(s) for lift/lower circuits has
damaged seals or is faulty.
Lift cylinder for affected deck is damaged.
Cutting decks will not lower.
NOTE: To lower a cutting deck, the
seat must be occupied and the trac-
tion speed must be in the LOW
(mow) position.
Lift arm pivots are binding.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (S1) in combination manifold is faulty.
Counterbalance pressure is excessive.
Lift cylinder for affected deck is damaged.
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