Drive System RD 12/RD 12A
wc_tx000667gb.fm 52
5.4 Checking the Drive System Relief Pressure
Prerequisites Machine on a firm, level surface
5000-psi pressure gauge
Procedure Follow the procedure below to check the relief presure.
1. Place blocks in front of and behind both drums to prevent the machine from moving, or
dead head the machine against a solid concrete abutment.
2. Set the parking brake.
3. Install a 5000-psi gauge in the forward test port (a) on the drive pump.
4. Start the engine and run the machine at full throttle.
5. Shift the forward/reverse control slowly into forward until pressure on the gauge tops
out. This is the forward relief valve pressure.
Note: Make sure the drums do not spin.
6. Install the gauge in the reverse test port (b) and repeat the procedure while operating in
reverse.
The relief pressure has now been checked.
CAUTION! Crushing hazard.
f To reduce the risk of injury, make sure no one is in front of or behind the machine during
this test.
wc_gr004124
a
b
200 bar
(2900 psi)
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