Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 34
Steering Circuit Problems
Problem Possible Cause
Steering is inoperative or sluggish. Steering components (e.g. tie r ods, steering cylinder ends) are
worn or binding.
Steering cylinder is binding.
Oil level in hydraulic reservoir is low (NOTE: other hydraulic sys-
tems are affected as w ell).
Steering relief valve in steering control valve is stuck or damaged.
Steering cylinder leaks internally.
Steering control valve is worn or damaged.
Gear pump section is worn or damaged (NOTE: a w orn or dam-
aged gear pump section will also affect the lift and traction (charge)
circuits).
Engine Cooling Fan Circuit Problems
Problem Possible Cause
Cooling fan runs only in forward di-
rection (fan does not run in reverse
direction).
Fan control manifold solenoid cartridge valve (S1) is faulty.
Electrical problem exists that prevents fan control manifold solenoid
valve (S1) operation (see Chapter 5 -- Electrical System).
Cooling fan does not rotate. Fan motor is worn or damaged.
Gear pump section for engine cooling fan circuit is worn or damaged.
Cooling fan always rotates at slow
speed.
Fan control manifold cartridge valve seals are leaking.
Check valve in fan control manifold is not seating.
Fan control manifold proportional relief valve (PRV) is stuck open.
Hydraulic fan motor is worn or damaged.
Cooling fan always rotates at fast
speed.
Fan control manifold proportional relief valve (PRV) is faulty.
Electrical problem exists that prevents fan control manifold propor-
tional relief valve (PRV) operation (see Chapter 5 -- Electrical Sys-
tem).
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