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Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 38
Engine Cooling Fan Circuit Problems
Problem Possible Cause
Cooling fan runs only in forward di-
rection(fandoesnotruninreverse
direction).
Solenoid cartridge valve (S10) in combination control manifold is
faulty.
Electrical problem exists that prevents combination control manifold
solenoid valve (S10) operation (see Chapter 5 -- Electrical System).
Cooling fan does not rotate. Cooling fan motor is worn or damaged.
Proportional relief valve (PRV) in combination manifold is stuck or
damaged.
Gear pump section for engine cooling f an circuit is worn or damaged
(NOTE: A worn or damaged gear pump section will also affect the
steering, lift/lower and traction charge circuits).
Cooling fan always rotates at slow
speed.
Combination manifold cartridge valve seals are leaking.
Check valve in combination manifold is not seating.
Proportional relief valve (PRV) in combination manifold is stuck or
damaged.
Hydraulic fan motor is worn or damaged.
Cooling fan always rotates at fast
speed.
Proportional relief valve (PRV) in combination manifold is faulty.
Electrical problem exists that prevents correct operation of combin-
ation manifold proportional relief valve (PRV) (see Chapter 5 --
Electrical System).