Steering Circuit Problems - Toro Groundsmaster 4700-D Service Manual

PTO Problems (Continued)
Problem
All cutting decks operate slowly.
Cutting deck stops under load.

Steering Circuit Problems

Problem
Steering inoperative or sluggish.
Hydraulic System
Possible Cause
Engine RPM is low.
Deck motor is damaged.
Gear pump section (P1 or P2) is worn or damaged.
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.
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 (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).
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