WARNING:
Hot oil or hydraulic fluid pressure can cause personal injury. Hydraulic fluid pressure remains in the hydraulic system after the engine is stopped. Failure to relieve pressure before servicing the hydraulic system can result in serious injury. When removing hydraulic system components or lines, ensure all work tools are lowered to the ground and the hydraulic fluid is cool. Remove the filler cap only after the engine is stopped and the filler cap is cool enough to touch with bare hands.
CAUTION: During inspection, maintenance, testing, adjustments, and repairs, care must be taken to ensure that any drained fluid is contained. Before opening any compartments or disassembling any components that contain fluids, have a suitable container available to collect the fluid.
For tools and supplies suitable for collecting and containing fluids on Cat products, refer to the specialized publication, NENG2500, "Dealer Service Tool Catalog."
Dispose of all fluids in accordance with local regulations and requirements.
1 Perform the following procedure to relieve hydraulic pressure from multiple hydraulic circuits in the main hydraulic system. 1. Park the machine on level ground.
CAT Comm Adapter 3 478-0235 Diagnostics for Caterpillar
2. Fully retract the boom cylinder linkage. Adjust the bucket so that it is parallel to the ground. Lower the boom until the bucket is level on the ground. Refer to Figure 1.
3. Shut off the engine.
4. Turn the engine start switch to the on position, but do not start the engine.
5. Place the hydraulic start control lever in the unlocked position.
6. Move the joystick or pedal to the full position for only the hydraulic circuit requiring service. This will relieve high pressure in that circuit only. This will also relieve any pressure that may be present in the pilot hydraulic circuit. Note: If the hydraulic circuit requiring service requires activation of an operating switch, activate the appropriate operating switch for that circuit.
7. Place the hydraulic start control lever in the locked position.
8. Start the engine.
9. Place the hydraulic start control lever in the unlocked position. Do not move any joystick or pedal from the neutral position during this step. Do not activate any switches during this step.
10. Return the hydraulic start control lever to the locked position.
11. Shut off the engine.
12. Repeat steps 4 through 11 for any other hydraulic circuits requiring service.
13. After relieving the hydraulic pressure in each targeted hydraulic circuit, return the hydraulic start control lever to the locked position.
14. Turn the engine start switch to the off position.
15. Slowly loosen the filler plug on the hydraulic tank to relieve pressure. Keep the filler plug loose for at least 45 seconds. This will relieve any pressure that may be present in the return hydraulic circuit. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis... Friday, October 26, 2018
16. Tighten the filler plug on the hydraulic tank to the specified torque.
17. The pressure in the multiple hydraulic circuits requiring maintenance has now been relieved, and the lines and components can be disconnected or removed from these hydraulic circuits.
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