RD 12/RD 12A Drive System
wc_tx000667gb.fm 51
5.3 Checking the Drive System Operating Pressure
Background Failure of the drive circuit to reach operating pressures is normally caused by a worn or
damaged drive pump; however, the problem could also be the result of a badly worn motor.
Prerequisites Machine on a firm, level surface
3000-psi pressure gauge
Hydraulic oil warm
Procedure Follow the procedure below to test the drive system operating pressure.
1. Install a 3000-psi gauge in the forward test port (a) on the drive pump.
2. Start the engine and run the machine at full throttle.
3. Shift the control lever to forward and record the pressure on the gauge.
4. Stop the engine.
5. Install the gauge in the reverse test port (b) and repeat the procedure while operating in
reverse.
Note: Operating pressures will increase significantly when running the machine uphill, off
road, or against an object.
The drive system operating pressure has now been checked.
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