Toro Greensmaster 3120 Service Manual page 88

Traction Circuit Testing – Charge Pressure Test (continued)
Hydraulic System: Testing the Hydraulic System
• For machines without backlap, connect a pressure gauge with hydraulic
hose to the test connector in the G3 port of the mower manifold; refer
to Figure 27.
• For early machines with backlap, disconnect the hose from the elbow at the
PT port of the mower manifold and install a swivel tee and test connector
fitting. Connect a pressure gauge with hydraulic hose to the newly installed
test connector; refer to
• For later machines with backlap, connect a pressure gauge with hydraulic
hose to the test connector at the PT port of the mower manifold; refer
to Figure 29.
g215375
1. Traction pump
5. Disconnect hose from traction pump "A" port; refer to
6. Install tester in series with the 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.
7. Attach a heavy chain to the rear of the machine frame and an immovable
object to prevent the machine from moving during testing.
8. Chock the wheels to prevent wheel rotation during testing.
9. Start engine. Move throttle to full speed (2850 ± 50 RPM).
10. Make sure hydraulic fluid is at normal operating temperature by operating the
machine for approximately 10 minutes.
11. Verify and record engine speed with a phototach.
12. Record the reading on pressure gauge from the PT port of the mower
manifold (not the pressure gauge on the flow meter). Charge pressure
(without load) should read approximately 414 kPa (60 PSI). If charge relief
pressure specification is not met, consider the following:
Figure 28.
Figure 30
2. Hose from traction pump "A" port
Page 4–42
Figure 30.
Greensmaster 3120
17230SL Rev C