MIDROLLER 1439013 - Caterpillar

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Extend the stick cylinder and extend the bucket cylinder until the work tool is curled past a vertical position. This must be performed before selecting UNLOCK on the monitor.
Select UNLOCK on the monitor.
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Hold the control lever for the bucket cylinder in the EXTEND position for 5 seconds in order to unlock the hook. A buzzer will sound until LOCKED is selected. In order to lift objects with the lifting eye of the quick coupler, refer to "Coupler Lifting Eye Operation without Bucket".
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Move the boom and the stick until the tool or the bucket is in the storage position. Keep the tool close to the ground.
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Rotate the quick coupler upward in order to release the bottom pin.
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Continue to rotate the quick coupler upward in order to release the top pin and completely release the work tool from the quick coupler.
Move the stick to a position that is clear of the work tool. Note: In order to lift objects with the lifting eye of the quick coupler, refer to "Coupler Lifting Eye Operation without Bucket".Coupling a Bucket that is Reversed
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When you use a hydraulic pin grabber quick coupler, you can connect to a bucket that is in a reversed position. Refer to Illustration 14 for an example of connecting to a bucket that is in a reversed position.
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In order to prevent the blocking bar from jamming, the quick coupler must be curled past a vertical position before selecting UNLOCK on the monitor. Extend the stick cylinder and extend the bucket cylinder until the quick coupler is curled past a vertical position.
Follow the same steps for coupling the work tool in order to couple the host machine to a bucket that is reversed. Refer to "Coupling the Work Tool" for the proper procedure.
When some Caterpillar buckets are used in the reverse position, it can be more difficult to couple the bucket and uncouple the bucket than in the normal position.Care must be taken to ensure that the position of the boom, stick, and bucket are aligned to ensure smooth coupling. The coupler must be in position between the bucket bosses.If the bucket is not fully engaged in the jaw of the coupler, the quick coupler can become snagged on the bucket bosses. The full weight of the bucket is then carried by the quick coupler sideplates, which can cause damage to the quick coupler.
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(1) Quick coupler
(2) Bucket
(3) Boss
(4) Hook Coupler Lifting Eye Operation without Bucket
Remove the work tool. Refer to "Uncoupling the Work Tool" for the proper procedure.
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In order to prevent the blocking bar from jamming, the quick coupler must be curled past a vertical position before selecting LOCK on the monitor. Extend the stick cylinder and extend the bucket cylinder until the quick coupler is curled past a vertical position.
Select LOCK on the monitor. The buzzer will no longer sound.
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Hold the control lever for the bucket cylinder in the EXTEND position for 5 seconds after selecting locked.
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Rotate the quick