Toro Groundmaster Series Service Manual page 129

Test Procedure (continued)
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A
Do not close tester valve fully when performing this test. In this
test, the hydraulic tester is positioned before the circuit relief valve.
Pump damage can occur if the fluid flow is completely restricted by
fully closing the tester flow control valve.
A. Monitor the tester pressure gauge carefully while slowly closing the flow
control valve until 5,516 kPa (800 psi) is obtained on the tester pressure
gauge.
B. Record the tester pressure and flow readings under load.
14. Verify the steering and lift circuit relief valve (R4) operation as follows:
A. Open the tester flow control valve fully.
When performing the test, do not allow the tester pressure to
exceed 8300 kPa (1400 PSI).
Hold steering wheel at full lock and hold the lift/lower switch at
full raise only long enough to obtain a system pressure reading.
B. Open the circuit relief valve via the steering system. Watch the pressure
gauge on the tester and turn the steering wheel completely in one
direction. The circuit relief valve should open just after the rear wheel
gets to the full lock position. Record the pressure at which the relief valve
opens.
C. Open the circuit relief valve via the lift system. Watch the pressure gauge
on the tester and set the lift/lower switch to the L
hold the switch with the cutting unit fully raised causing the circuit relief
valve to open. Record the pressure at which the relief valve opens.
15. Move the throttle to low speed position and set the key switch to the O
position.
16. The under load test flow reading (step 13) should not drop more than 15%
when compared to the no load test flow reading (step 12). A difference in
flow of more than 15% (Under Load > No Load X 0.85) may indicate:
A. A restriction in the pump inlet line.
B. The charge pump is worn and should be replaced or repaired; refer to
Gear Pump (P2) (page 5–75)
17. The circuit relief valve pressure should be 7000 to 7500 kPa (1015 to 1088
PSI). If the relief pressure can not be met or is greater than specified, the
steering control valve is damaged and should be replaced or repaired; refer
to Steering Control Valve (page 5–95)
(page 5–97).
18. After testing:
A. Remove the hydraulic hoses and tester.
CAUTION
CAUTION
IMPORTANT
or Gear Pump (P2) Service (page
or Steering Control Valve Service
Page 5–43 Hydraulic System: Testing the Hydraulic System
position. Momentarily
IFT
FF
5–78).