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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 42
Engine Cooling Fan Circuit Problems
Problem Possible Cause
Cooling fan runs only in forward di-
rection(fandoesnotruninreverse
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. F an motor is worn or damaged.
Last gear pump section 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).