Usage:
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Personal injury can result from hydraulic oil pressure and hot oil. Hydrauic 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 attachments have been lowered, 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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1. Move the machine to a smooth level location. Move away from working machines and personnel.
2. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.
3. Engage the parking brake. Put blocks in front of and behind the wheels.
4. Install the steering frame lock pin so the machine can not turn.
5. When the bucket is raised for tests or adjustments, be sure that the bucket and lift arm has correct support. The lift circuit has high oil pressure when the lift arms raise the front of the machine. Do not stop the engine with the front of the machine off the ground, unless a system test requires it. Lower the machine to the ground and stop the engine.
6. To make sure all hydraulic pressure is released before any fitting, hose or component is loosened, tightened, removed or adjusted, perform the following steps:
a. Lower the bucket to the ground.
b. If the machine is equipped with ride control, with the engine running, turn the ride control switch to the ON position. Move the joystick control lever to the FLOAT position. This will relieve all of the hydraulic pressure in the ride control accumulator.
c. Stop the engine.
d. Move the joystick control lever several times in all directions to release any remaining pressure in the hydraulic system.
e. Depress the brake pedal at least eighty times to release any pressure in the brake accumulators.
f. Move the STIC steering control several times in both directions to release any pressure in the steering system.
g. Press and hold the vacuum breaker/relief valve plunger to release any pressure in the hydraulic tank.
h. Connect a 27 600 kPa (4000 psi) gauge to test point (1) on the tilt cylinder. If any pressure is registered on the gauge, move the control lever to all positions until all pressure is removed from the system.
i. Connect a 27 600 kPa (4000 psi) gauge to test point (2) on the tilt cylinder. If any pressure is registered on the gauge, move the control lever to all positions until all pressure is removed from the system.
j. The pressure in the system has now been released and lines or components can be removed.
k. Remove the test equipment.