725C, 725C2, 730C and 730C2 Articulated Truck Systems Caterpillar

Relieving the System Pressure

Make sure that all system pressure is relieved before any component is loosened, tightened, removed, or adjusted. Perform the following procedure in order to relieve all pressure from the system.

1. Start the engine and fully retract the ejector blade. Move the ejector control to the HOLD position.

2. Shut off the engine and then turn the engine start switch to the ON position.

3. Engage the service brakes several times until all pressure is relieved from the oil in the service brake system.

4. Move the parking brake control between the ENGAGED position and the DISENGAGED position. Repeat this procedure several times until all pressure is relieved from the oil in the parking brake system.

5. Turn the engine start switch to the OFF position.

6. Rotate the steering wheel clockwise. Rotate the steering wheel counterclockwise.

7. Carefully remove the filler cap from the hydraulic tank for the ejector and braking systems. This action will relieve any pressure which is inside the hydraulic tank.

8. Carefully remove the filler cap from the hydraulic tank for the steering and fan drive systems. This action will relieve the pressure which is inside the hydraulic tank.

9. Install the filler caps.

Before you start the troubleshooting process, check for fault codes. When you are troubleshooting a problem, start with the visual checks. If visual checks fail to identify the problem, do performance tests. If performance tests fail to identify the problem, perform instrument tests.