Usage:
Fluid Spillage Containment
Care must be taken to ensure that the fluids are contained during performance of the inspection, the maintenance, the testing, the adjusting and the repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to the "Tools And Shop Products Guide, NENG2500" the tools and the supplies suitable to collect and contain any of the fluids in Caterpillar machines. Dispose of the fluids according to local regulations and mandates.
NOTE: The solenoid valves are located behind the right rear access door. The removal and the installation procedure for all of the solenoid valves is the same.
 |
At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the hydraulic system before any of the hydraulic lines or any of the components are disconnected or removed. |
 |
1. Release the pressure in all of the implement hydraulic circuits (the boom, the stick and the bucket) before any of the hydraulic lines or any of the components are disconnected or removed, as follows:
a. Fully retract the stick cylinder rod.
b. Adjust the position of the bucket so that it will be flat on the ground when the boom is lowered.
c. Lower the boom until the bucket is flat on the ground.
d. Shut off the engine and place key in the "ON" position. Put the hydraulic activation control lever in the "UNLOCK" position.
e. Move the control levers for the boom, the stick and the swing to all full stroke positions. This will release any pressure that might be present in the pilot system.
f. Return the key to "OFF" position.
g. Slowly loosen the fill plug on the hydraulic tank and release the pressure.
h. Tighten the fill plug on the hydraulic tank. Tighten the fill plug to a torque of 68 ± 7 N*m (50 ± 5 lb ft).
i. The pressure in the hydraulic system has been released and the hydraulic lines and the components can be removed.
NOTE: The removal and the installation procedure for the fine control solenoid valve, the travel speed solenoid valve and the swing priority solenoid valve is the same. In the procedure which follows, the fine control solenoid valve is removed and installed.
2. Oil will drain from the pilot manifold when the solenoid valve is removed. Place a drain pan under the pilot manifold to contain the drain oil.
3. Disconnect wiring harness (1).
4. Remove two socket head bolts (2) that hold solenoid valve (3) to the pilot manifold. Remove the solenoid valve.
4. Remove four O-ring seals (4) from the solenoid valve.
NOTE: The following steps are for the installation of the solenoid valves.
5. Check the condition of four O-ring seals (4). If the O-ring seals are damaged, use new parts for replacement.
6. Install solenoid valve (3) in the reverse order of the removal steps.
7. Tighten two socket head bolts that hold the solenoid valve (3) to the pilot manifold to a torque of 9 ± 1 N*m (7 ± 1 lb ft).
NOTE: Refer to the topic "Lubricant Viscosities and Refill Capacities" in the "Operation & Maintenance Manual" for the proper filling procedure and the proper levels for the hydraulic oil system.
8. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank to the correct level.