Release Procedure (Implement System)
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
- If the machine is equipped with a ride control system, move the ride control switch to the ON position.
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Illustration 1 g02009358 - Position the bucket or the work tool just above the ground at a slight downward angle in order to ensure that the head end of the lift cylinders is pressurized.
- Turn the engine start switch to the OFF position.
- When the engine has stopped, turn the engine start switch back to the ON position so the pilot oil can reach the main valve.
- Ensure that the implement lockout switch is in the UNLOCKED position.
- Move the lift control lever to the FLOAT position and the tilt control lever to the TILT BACK position at the same time. This action allows the bucket or the work tool to tilt back while the boom is lowered.
The bottom of the bucket or the work tool should rest flat on the ground. The weight of the linkage should be supported by the ground. The pressure from the head end of the lift cylinders and from the ride control accumulator is now vented to the hydraulic tank.
- When the bucket or the work tool has settled to the ground, move both control levers to the HOLD position. Then, cycle the control levers through all positions in order to purge any remaining pressure from the implement hydraulic system.
- Turn the engine start switch to the OFF position.
- Press the breaker relief valve release button on the hydraulic tank in order to release the pressure within the hydraulic tank.
- Slowly loosen the hydraulic tank filler cap.
- Tighten the filler cap.
- The pressure in the hydraulic tank has been released. Lines and components can be removed.
Release Procedure (Steering System and Braking System)
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
- Straighten the machine and install the steering link.
- Engage the parking brake.
- Lower the bucket to the ground and stop the engine.
- Move the STIC steering and transmission lock control to the LOCKED position.
- Depress the brake pedal repeatedly until all pressure is released from the braking system.
- Slowly loosen the hydraulic tank filler cap in order to release the pressure from the hydraulic tank.
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Illustration 2 g02649576 Two bleeder screws located on the steering control valve. - Attach suitable hoses to each bleeder screw that is located on the steering control valve. Be sure that the hoses are running into a suitable container. Oil will escape from the hydraulic system when the bleeder screws are loosened. Direct the other end of each hose into a suitable container.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information containing fluid spillage.
- Slowly turn the bleeder screws in a counterclockwise direction a maximum of 1/2 turn in order to allow the oil pressure to be released from the hydraulic system.
- After all of the pressure has been released, tighten the hydraulic tank filler cap. The hydraulic system pressure has now been released. Hydraulic lines and components can now be removed.
- If the electronics fail, it may not be possible to relieve all stored hydraulic oil pressure. The following precautions should be taken.
- Turn the engine OFF.
- The machine should be secured with a lockout.
- Use the appropriate stand or blocks to prevent undesired drift of implements.
- Barriers should be used in order to prevent personnel from entering areas that implement drift or movement could be hazardous.
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Illustration 3 g02648916 - A valve is located near the articulation joint on the right side of the machine. Slowly turn the valves square stem in a clockwise direction. The square stem should be rotated 90 degrees in order to relieve the lift cylinder hydraulic pressure.
- Rotate the square stem counterclockwise 90 degrees once the pressure has been released from the lift cylinder circuit.
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Illustration 4 g02649576 Two bleeder screws located on the steering control valve. - Attach suitable hoses to each bleeder screw that is located on the steering control valve. Be sure that the hoses are running into a suitable container. Oil will escape from the hydraulic system when the bleeder screws are loosened. Direct the other end of each hose into a suitable container.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information containing fluid spillage.
- Slowly turn the bleeder screws in a counterclockwise direction a maximum of 1/2 turn in order to allow the oil pressure to be released from the hydraulic system.
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Illustration 5 g02649518 Two bleeder screws located on the hydraulic valve. - Attach suitable hoses to each bleeder screw that is located on the hydraulic valve. Be sure that the hoses are running into a suitable container. Oil will escape from the hydraulic system when the bleeder screws are loosened. Direct the other end of each hose into a suitable container.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information containing fluid spillage.
- Slowly turn the bleeder screws in a counterclockwise direction a maximum of 1/2 turn in order to allow the oil pressure to be released from the hydraulic system.
- Close the bleeder screws and remove the hoses when the pressure is released from the tilt circuit. Do not allow the oil that is contained in the hose to spill.
- The oil that is collected during this procedure must be disposed of according to local regulations.
