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| Illustration 1 | g02384309 |
Quick coupler valve location on the inside left wall of the non-engine end frame near the parking brake cylinder (1) Enable Solenoid (2) Disengage Solenoid (3) Engage Solenoid | |
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| Illustration 2 | g02384310 |
Quick coupler connections to the Machine ECM | |
Note: When using the quick coupler to engage a work tool, always verify that the coupler wedges are engaged in the proper position to lock the work tool. Visually inspect the coupler wedge position or manipulate the tool in a manner that will confirm that the tool is locked in place.
When the attachment Quick Coupler system is equipped on the machine, the Machine ECM will control the operation of the quick coupler. The Quick Coupler Installation Status must be set to "Installed" in the software using Cat ET. In addition, the Implement ECM parameter "Implement Tool Type" must be set to "Quick Coupler".
The Machine ECM will use three solenoid valves to control the system. The solenoids are the Enable Solenoid Valve, the Engage Solenoid Valve, and the Disengage Solenoid Valve.
The Disengage Solenoid is connected to a Machine ECM ON/OFF driver circuit. The Engage Solenoid and the Enable Solenoid are connected to ECM proportional driver circuits, however, the ECM will control all three solenoids as ON/OFF solenoids.
The ECM will use the operator input from the quick coupler control button on the Keypad 8 to control the state of the coupler. The status of the button is communicated to the Monitoring System Display on the CAN A Data Link system. The Monitoring System Display will command the Machine ECM to engage or disengage the quick coupler.
At engine start, the Machine ECM will remember the last known state of the quick coupler. The quick coupler will remain in that state unless the last known state is unknown. When the quick coupler is disengaged, the middle indicator by the keypad button will be illuminated.
If the quick coupler state is unknown, the ECM will activate a Level 2, E919 event for "Quick Coupler Desired State Unknown". An unknown state can result initially when the quick coupler feature is set to "Installed" in the software. An unknown state can also result after new software is flashed to the ECM.
If the quick coupler state is unknown, the function will be in a neutral state. All three solenoids will be de-energized.
If the quick coupler state is unknown to the ECM, the operator must cycle through the possible states by repeatedly pressing the button. Once the desired coupler state (engaged or disengaged) is indicated, press and hold the button depressed for 2 seconds. When the button is held depressed, the ECM will enable quick coupler operation in the selected state.
The UP and DOWN buttons on the monitoring system display can also be used to cycle through the coupler states. When the desired state is indicated, use the "OK"button to select.
The quick coupler state can only be changed when the engine is in operation. the ECM will not allow the state of the quick coupler to change with the engine OFF.
When the quick coupler is enabled and the button is pressed to engage the quick coupler, an audible beep will sound 3 seconds after the engage solenoid is energized by the Machine ECM.
However, the beep does NOT indicate that the wedges are properly engaged in the work tool. Always confirm by visual inspection or by movement of the work tool that the wedges are locked in the correct position to lock the work tool in place.
When the button is pressed to disengage the quick coupler, an audible beep will sound continuously while the coupler is disengaged. The beep will turn OFF when the coupler is engaged.
Hydraulic supply oil is supplied to the quick coupler valve from the brake accumulators. The ECM will use the Enable Solenoid valve to direct supply oil to the quick coupler circuit or to block the oil supply from the circuit.
When the Enable Solenoid Valve and the Engage Solenoid Valve are energized, supply oil will be directed to the head end of the coupler cylinders. Oil pressure will engage the wedges in the work tool. Both solenoids will remain energized when the quick coupler is engaged.
If the hydraulic oil supply is interrupted or if an abnormal circuit condition disables a solenoid, check valves will maintain hydraulic pressure in the head end of the quick coupler cylinders for a time. The quick coupler will remain engaged.
When the Enable Solenoid valve and the Disengage Solenoid valve are both energized, the supply oil will be directed to the rod end of the cylinders. The wedges will be disengaged from the work tool. Both solenoids will remain energized when the quick coupler is disengaged.
The Machine ECM will monitor all three solenoids and circuits for abnormal conditions. The ECM will activate a diagnostic code and a condition code for a specific circuit if an abnormal circuit condition is detected. When a fault is active, the ECM will de-activate quick coupler operation. The coupler will remain in the last active state.
The following diagnostic codes are assigned to the three quick coupler solenoids:
- CID 2814 - Quick Coupler Engage Solenoid
- CID 2815 - Quick Coupler Disengage Solenoid
- CID 3061 - Quick Coupler Enable Solenoid