PISTON 2941744 - Caterpillar

Operation
This procedure describes the use of the hydraulic circuit with a Caterpillar dedicated quick coupler. If a different quick coupler is used, please contact your Caterpillar dealer for pressure adjustment and consult the documentation for the quick coupler for proper operation.
The engine start switch is on.
The engine is running.
The hydraulic lockout control must be in the UNLOCKED position in order to operate the quick coupler controls.
During the operation, the alarm will sound.When the above conditions are achieved, the system will perform the desired operation. A warning alarm will sound if the switch for the quick coupler is turned to the LOCKED position or the UNLOCKED position as long as the hydraulic lockout control is in the UNLOCKED position.Resetting the Quick Coupler Controls
Operation of the quick coupler may be interrupted by deactivating the hydraulic lockout control. The quick coupler controls will be disabled. Use the following procedure to reset the quick coupler control.
Return the quick coupler switch to the LOCKED position.
Turn the engine start switch to the OFF position and then turn the engine start switch to the ON position.
Move the hydraulic lockout control to the LOCKED position. Securing the Work Tool
Inspect the coupler wedge engagement before you operate the excavator.Serious injury or death may result from an improperly engaged coupler.Inspect coupler wedge engagement from the cab by rotating the bucket or the work tool inward. Extend the bucket cylinder to bring the coupler actuator into view and bring the stick in until the wedges are visible.
Illustration 1 g00104707
Position the work tool on a level surface.
Retract the bucket cylinder. Position the quick coupler in alignment between the hinges of the work tool.
Illustration 2 g00104708
(1) Lower bosses
(2) Hinges
Move the stick forward and raise the stick until the lower bosses (1) engage the hinges (2) of the work tool.
Illustration 3 g03733058
(3) Locked
(4) Quick coupler switch
(5) Unlocked
Move the switch for the quick coupler to the UNLOCKED position in order to extend the wedge. Use this position only during the coupling or uncoupling of the work tool. The hydraulic system is pressurized for 10 seconds when the switch is in the UNLOCKED position. Note: Whenever the switch is on the UNLOCKED position, a warning alarm will sound.
Illustration 4 g01620262
(6) Center bosses
(7) Locking area
Extend the bucket cylinder in order to rotate the quick coupler toward the work tool. Center bosses (6) must engage with the cutout of the hinge.
Move the switch for the quick coupler to the LOCKED position in order to retract the wedge. The hydraulic system is pressurized for 10 seconds when the switch is in the UNLOCKED position. The springs in the quick coupler will move the wedge into the locking area (7). Note: The warning alarm will sound for 10 seconds.
Illustration 5 g00104710
Raise the boom or raise the stick. Retract the bucket cylinder in order to confirm that the wedge is fully engaged. If the wedge is fully engaged, the work tool is locked in place. The work tool is ready to use. Releasing the Work Tool
Place the work tool or bucket in a safe