Usage:
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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 the implement hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed. |
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- a. Fully retract the rod in the stick cylinder.
- b. Adjust the position of the bucket so 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 put the hydraulic activation control lever in the "Lock" position.
- e. Move the control levers for the boom, bucket, stick and swing through their full travel strokes. This will relieve any pressure that may be present in the pilot system.
- f. Slowly loosen the air breather cap on the hydraulic oil tank to release the pressure.
- g. Tighten the air breather cap on the hydraulic oil tank.
- h. The pressure in the hydraulic system has now been released. Lines and components can now be removed.
- b. Adjust the position of the bucket so it will be flat on the ground when the boom is lowered.
1. Release the pressure in the hydraulic system as follows:
View From Under Cab
2. Remove seven bolts (1), the washers and spacers that hold access cover (2) in place. Remove the access cover from under the cab.
View From Under Cab
3. Put identification marks on ten hose assemblies (6) that are connected to the hydraulic activation control valve so they can be reinstalled in their original locations. Disconnect the ten hose assemblies from the hydraulic activation control valve. Put plugs in the ends of the hose assemblies to keep dirt and debris out of the hydraulic system.
4. Disconnect wiring harness (4) from the neutral switch.
5. Disconnect rod (5) from the hydraulic activation control valve.
6. Remove the two bolts and washers that hold the hydraulic activation control valve (3) in place. Remove the hydraulic activation control valve.
NOTE: The following steps are for the installation of the hydraulic activation control valve.
7. Put hydraulic activation control valve (3) in place under the cab. Install the two washers and bolts that hold it.
8. Connect rod (5) to the hydraulic activation control valve.
9. Connect wiring harness (4) to the neutral switch in the hydraulic activation control valve.
10. Check the condition of the O-ring seals used in the hose assemblies that are connected to the hydraulic activation control valve. If any of the seals are worn or damaged, use new parts for replacement.
11. Connect ten hose assemblies (6) to the hydraulic activation control valve. If any of the seals are worn or damaged, use new parts for replacement.
12. Reinstall access cover (2) under the cab.
13. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank with oil to the correct level. See the Operation & Maintenance Manual for the correct filling procedure.
Disassemble & Assemble Hydraulic Activation Control Valve
Start By:
a. remove hydraulic activation control valve
1. Be sure the hydraulic activation control valve is thoroughly clean prior to disassembly.
2. Put identification marks on all hydraulic fittings in the valve body as to their location. Remove fittings from the valve body.
3. Mark the position of lever (12) on the end of valve spool (9) so it can be reinstalled in its original position. Remove nut (13) and lockwasher (6). Remove lever (12) from the end of the valve spool.
4. Remove bolts (5) and retainer (4) from valve body (3). Remove bolts (1) and block (2) from valve body (3). Slide valve spool (9) out of the valve body.
5. Remove rings (7) and (11) and seals (8) and (10) from the valve body.
NOTE: Assemble the hydraulic activation valve in the reverse order of disassembly. Prior to assembly, be sure all parts of the valve are clean and free of dirt and debris. Put clean hydraulic oil on the internal parts of the valve. Also, check the condition of the seals and rings. If any of the seals or rings are worn or damaged, use new parts for replacement. Tighten nut (13) that holds lever (12) in position to a torque of 12.5 ± 2.5 N·m (10 ± 2 lb ft).
End By:
a. install hydraulic activation control valve