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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 40
Mow Circuit Problems (Continued)
Problem Possible Cause
All cutting decks operate slowly. Engine RPM is low.
Deck motor is damaged.
First and second gear pump sections are worn or damaged.
Cutting deck stops under load. Relief valve in deck control manifold is bypassing.
Traction speed and cutting conditions (e.g. very tall or wet grass)
exceed deck capacity.
Deck motor relief valve is stuck or damaged.
Deck motor has internal leakage (bypassing oil).
Cutting deck gear pump section ( first or second section) is worn or
damaged.
Steering Circuit Problems
Problem Possible Cause
Steering inoperative or sluggish. Steering components (e.g. tie rods, steering cylinder ends) are
worn or binding.
Steering cylinder is binding.
Oil level in hydraulic reservoir is low (other hydraulic systems af-
fected as well).
Steering relief valve in steering control valve is stuck or damaged.
Flow divider (FD) in fan control manifold is faulty.
Steering cylinder leaks internally.
Steering control valve is worn or damaged.
The third gear pump section is worn or damaged (NOTE: A worn or
damaged third gear pump section will also affect the traction
charge and lift circuits).