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.
1. Start the machine, and fully extend the stick and the bucket. Lower the stick and the bucket to the ground.
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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 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. |
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2. 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. Release the pressure as follows:
a. Shut off the engine and place key in the "ON" position. Put the hydraulic activation control lever in the "UNLOCK" position.
b. 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.
c. Return the key to "OFF" position.
d. Slowly loosen the fill plug on the hydraulic tank and release the pressure.
e. Tighten the fill plug on the hydraulic tank. Tighten the fill plug to a torque of 68 ± 7 N*m (50 ± 5 lb ft).
f. The pressure in the hydraulic system has been released and the hydraulic lines and the components can be removed.
3. Remove five bolts (1), the washers and cover plate (2) from under the cab.
View From Under Cab
4. Put identification marks on ten hose assemblies (3) that are connected to the shuttle valve for installation purposes.
5. Oil will drain from ten hose assemblies (3) and the shuttle valve when the hose assemblies are disconnected from the valve. Place a drain pan under the area of the shuttle valve to contain the drain oil. Disconnect ten hose assemblies (3) from the shuttle valve. Put plugs in the ends of the hose assemblies to prevent oil loss and to keep contaminants out of the hydraulic system.
View From Under Cab
6. Remove two bolts (5), the washers and shuttle valve (4) from under the cab floor.
NOTE: The following steps are for the installation of the shuttle valve.
7. Check the condition of the O-ring seals used in the ends of the hose assemblies that connect to the shuttle valve. If any of the O-ring seals are damaged, use new parts for replacement.
8. Install shuttle valve (4) in the reverse order of the removal steps.
9. Tighten ten hose assemblies (3) to a torque of 40 ± 5 N*m (30 ± 4 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.
10. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank with oil to the correct level.