Toro Greensmaster 3120 Service Manual page 111

Steering/Lift Circuit Testing – Lowering Cutting Units Relief
Valve Test (continued)
Greensmaster 3120
17230SL Rev C
Note: Lowering the cutting units is an electrically timed function and
automatically turns off after approximately six (6) seconds. If the relief
pressure cannot be determined within the six (6) second time frame, repeat
the test procedure.
10. Watch pressure gauge carefully while moving the joystick control lever to the
LOWER position and note pressure that relief valve opens. Turn the engine
OFF and record the test results.
Note: The lowering cutting units relief valve is in series with the charge relief
valve. Charge relief pressure will affect the lower cutting units relief pressure.
11. The lowering cutting units relief valve pressure should be approximately 1724
kPa (250 PSI) higher than the charge relief pressure (e.g. if the charge relief
valve pressure is 414 kPa (60 PSI), the lowering relief valve pressure should
be approximately 2137 kPa (310 PSI)).
Page 4–65 Hydraulic System: Testing the Hydraulic System