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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 38
PTO Problems (Continued)
Problem Possible Cause
All cutting decks operate slowly. Engine RPM is low.
Deck motor is damaged.
Gear pump section (P1 or P2) is worn or damaged.
Cutting deck stops under load. Relief valve in deck control manifold is bypassing.
Cutting conditions (e.g. very tall or wet grass) exceed deck capac-
ity.
Deck motor relief valve is stuck or damaged.
Deck motor has internal leakage (bypassing oil).
Cutting deck gear pump section (P1 or P2) 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.
Gear pump section (P3) is worn or damaged (NOTE: A worn or
damaged gear pump section (P3) will also affect the traction
(charge) and lift circuits).