Steering Circuit Problems - Toro Groundsmaster 4100-D Service Manual

Steering Circuit Problems

Problem
Steering is inoperative or sluggish.
Engine Cooling Fan Circuit Problems
Problem
Cooling fan runs only in forward di-
rection (fan does not run in reverse
direction).
Cooling fan does not rotate.
Cooling fan always rotates at slow
speed.
Cooling fan always rotates at fast
speed.
Hydraulic System
Possible Cause
Steering components (e.g. tie rods, 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 well).
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 worn or dam-
aged gear pump section will also affect the lift and traction (charge)
circuits).
Possible Cause
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).
Fan motor is worn or damaged.
Gear pump section for engine cooling fan circuit is worn or damaged.
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.
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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