Toro Greensmaster 3120 Service Manual page 107

Steering/Lift Circuit Testing – Gear Pump (P3) Flow and Circuit
Relief Valve Test (continued)
Greensmaster 3120
17230SL Rev C
g216910
1. Gear pump section (P3)
4. Disconnect hose connection on the bottom of gear pump (P3); refer to
41.
5. Install tester between the gear pump and the disconnected hose. Make
sure the tester is installed in the correct flow direction and the tester flow
control valve is fully open.
6. Start engine. Move throttle to full speed (2850 ± 50 RPM).
7. Make sure hydraulic fluid is at normal operating temperature by operating the
machine for approximately 10 minutes.
8. Verify and record engine speed with a phototach.
9. Test the gear pump (P3) flow as follows:
A. Record tester pressure and flow reading with pump At No Load.
Unrestricted pump output should be approximately 14.7 LPM (3.9 GPM).
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 fully restricted
by fully closing the tester flow control valve.
B. To verify the pump flow Under Load, watch flow meter pressure gauge
carefully while slowly closing the flow control valve until 5516 kPa (800
PSI) is obtained on gauge.
Figure 41
2. Hydraulic hose
CAUTION
Page 4–61 Hydraulic System: Testing the Hydraulic System
Figure