Toro Groundsmaster 4500-D Series Service Manual page 175

Procedure for Steering Circuit Relief Pressure Test (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
stabilize briefly and then may continue to increase. The steering circuit relief
pressure is the gauge reading when pressure stabilizes.
GAUGE READING TO BE 80 to 103 bar (1150 TO 1500 PSI).
8. Stop the engine. Record test results.
9. If steering relief pressure is incorrect, inspect steering relief valve located in
the steering control valve (see
If relief valve is operating properly and if lift/lower and traction charge circuit
problems also exist, the third gear pump section should be suspected of
wear or damage. If steering wheel continues to turn at end of cylinder travel
(with lower than normal effort), steering cylinder or steering control valve
may be worn or damaged.
10. When testing is complete, turn steering wheel to both the right and the left
with the engine not running to relieve steering circuit pressure. Remove
pressure gauge from hydraulic hose and steel cap from steering cylinder
fitting. Connect hydraulic hose to steering cylinder fitting.
Steering Control Valve Service (page
Page 5–73
5–141)).
Hydraulic System: Testing