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The vibration caused by extensive use of a hydraulic hammer as well as the added weight of certain demolition tools such as shears, crushers, and pulverizers may cause premature wear and decreased service life of the coupler. Be sure to inspect the coupler daily for cracks, bent components, or wear when operating with any of the above work tools. |
The quick coupler is used to change work tools while the operator remains in the cab. The quick coupler can be used with a broad range of buckets and work tools. Each work tool must have a set of pins in order for the quick coupler to work properly.
The work tools are held onto the quick coupler by two independent locking mechanisms. The work tool rear pin locking mechanism consists of a hydraulically driven wedge. If pressure is lost, a check valve in the hydraulic cylinder traps oil to ensure that the lock remains in place. Also, a fully independent locking system exists on the front pin of the work tool. This system is spring applied and hydraulically released, ensuring that the work tool is locked immediately after the front pin of the work tool is seated. Always ensure that the hydraulic system and the locking mechanisms are working properly before using the quick coupler.
Description of the Instruction Film
An instruction film is included with the quick coupler. The instruction film illustrates the proper operation of the quick coupler.
Note: For detailed instructions on the operation of the quick coupler, refer to "Coupling the Work Tool" and "Uncoupling the Work Tool".
The instruction film should be legible at all times. Clean the film or replace the film if the film is not legible. When you clean the film, use a cloth, water, and soap. Do not use solvent, gasoline, or harsh chemicals to clean the film. Solvents, gasoline, or harsh chemicals could loosen the adhesive that secures the film. Loose adhesive will allow the film to fall. If the film is damaged or the film is missing, replace the film. For more information, consult your Cat dealer.
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| Illustration 1 | g02165534 |
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Instruction film | |
Description of the Top Frame on the Film (Uncoupling the Work Tool)
- Position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket.
- Move electric switch (1) to the UNLOCK position.
- Retract the bucket cylinder, ensuring that the work tool rear pin locking mechanism is unlocked. The rear of the quick coupler should be rotated away from the work tool. Place the work tool in a stable and safe position on the ground.
- Depress the electric momentary switch (2). This will unlock the work tool front pin locking mechanism. This locking mechanism will remain unlocked for 10 seconds.
- Within the 10 second time period, retract the stick cylinder until the quick coupler is disengaged from the work tool. Ensure that the work tool is in a stable and safe storage position on the ground.
Description of the Bottom Frame on the Film (Coupling the Work Tool)
- Align the quick coupler front locking mechanism over the front pin of the work tool. Extend the stick cylinder until the automatic front locking mechanism of the quick coupler engages and secures the front pin of the work tool.
- Extend the bucket cylinder until the rear of the quick coupler is rotated toward the work tool and contacts the work tool rear pin. Position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket.
- Move electric switch (1) to the LOCK position.
- Hold the control lever for the bucket cylinder in the EXTEND position for 5 seconds after the electric switch has been locked.
- Ensure that the quick coupler pins are engaged. Retract the bucket cylinder and drag the attachment on the ground. Visually confirm that there is no movement between the work tool and the quick coupler.
- Visually confirm positive indication of the ISO Engagement indicator, if equipped.
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Crush injury. Could cause serious injury or death. Always confirm that the quick coupler is engaged onto the pins. Read the Operator's Manual. |
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Back drag the work tool on the ground to ensure the quick coupler is properly locked. Do Not strike the work tool on the ground to ensure the quick coupler is properly locked. Striking the work tool on the ground will result in damage to the coupler cylinder. |
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| Illustration 2 | g03881026 |
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(1) Lock/Unlock (Rear pin)
(2) Unlock (Front pin) | |
Two electrical switches are located inside the cab. Use of both switches is required to release the work tool. Switch (1) is a two-position switch used to unlock the work tool rear pin locking mechanism. Switch (2) is a momentary switch used to unlock the work tool front pin locking mechanism. Switch (2) will function only when switch (1) is in the unlock position. Once switch (2) is depressed, the work tool front pin locking mechanism will unlock for 10 seconds. After this time, the mechanism will automatically close. Depressing switch (2) during the 10 second sequence will also close the work tool front pin locking mechanism.
Refer to this Operation and Maintenance Manual, "Operator Controls" for the location of the electric switch.
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UNLOCK - To unlock the coupler, position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket. Move electric switch (1) to the UNLOCK position. Confirm that the buzzer is sounding with an intermittent pattern of one beep per second. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer. Retract the bucket cylinder, ensuring that the work tool rear pin locking mechanism is unlocked. The rear of the quick coupler should be rotated away from the work tool. Place the work tool in a stable and safe position on the ground. Depress the electric momentary switch (2). Confirm that the buzzer is sounding with an intermittent pattern of two beeps per second. This will unlock the work tool front pin locking mechanism. This locking mechanism will remain unlocked for 10 seconds. Within the 10 second time period, retract the stick cylinder until the quick coupler is disengaged from the work tool. Ensure that the work tool is in a stable and safe storage position on the ground. |
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LOCK - To lock the coupler, align the quick coupler front locking mechanism over the front pin of the work tool. Extend the stick cylinder until the automatic front locking mechanism of the quick coupler engages and secures the front pin of the work tool. Confirm that switch (1) is in the UNLOCK position and that the buzzer is sounding with an intermittent pattern of one beep per second. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer. Extend the bucket cylinder until the rear of the quick coupler is rotated toward the work tool and contacts the work tool rear pin. Position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket. Move electric switch (1) to the LOCK position. The buzzer will no longer sound. Hold the control lever for the bucket cylinder in the EXTEND position for 5 seconds after the electric switch has been locked. To verify the engagement of the work tool, perform the following procedure. Visually confirm the engagement of the work tool. Ensure that both the work tool front and rear pin locking mechanisms are locked and securing the work tool to the coupler. Retract the bucket cylinder and drag the attachment on the ground. Visually confirm that there is no movement between the work tool and the quick coupler. Visually confirm positive indication of the ISO Engagement indicator, if equipped. |
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Improper attachment of work tools could result in serious injury or death. Do not operate this machine until you have positive indication that the locking mechanisms are fully engaged. Check for engagement by:
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Place the work tool or bucket in a safe position before engaging the quick coupler. Ensure that the work tool or bucket is not carrying a load. Serious injury or death may result from engaging the work tool or bucket when it is in an unstable position or carrying a load. |
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Crush injury. Could cause serious injury or death. Always confirm that the quick coupler is engaged onto the pins. Read the Operator's Manual. |
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The buzzer will not sound when the switch is in the lock position. The position of the switch does not confirm that the quick coupler locking system is properly engaged with the attachment pins. Visually confirm positive indication of the ISO Engagement Indicator, if equipped. A physical test is required by dragging the work tool on the ground to confirm that the coupler pins are engaged. |
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Always confirm that the buzzer sounds when the switch is in the unlock position. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer. |
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With certain work tool combinations, including quick couplers, the work tool can hit the cab or the front of the machine. Always check for interference when first operating a new work tool. |
- Align the quick coupler front locking mechanism over the front pin of the work tool. Extend the stick cylinder until the automatic front locking mechanism of the quick coupler engages and secures the front pin of the work tool.
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Illustration 4 g02163292 - Confirm that switch (1) is in the UNLOCK position and that the buzzer is sounding with an intermittent pattern of one beep per second. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer. Extend the bucket cylinder until the rear of the quick coupler is rotated toward the work tool and contacts the work tool rear pin. Position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket.
- Move electric switch (1) to the LOCK position. The buzzer will no longer sound.
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Crush injury. Could cause serious injury or death. Always confirm that the quick coupler is engaged onto the pins. Read the Operator's Manual.
- Hold the control lever for the bucket cylinder in the EXTEND position for 5 seconds after the electric switch has been locked.
- To verify the engagement of the work tool, perform the following procedure:
- Visually confirm the engagement of the work tool. Ensure that both the work tool front and rear pin locking mechanisms are locked and securing the work tool to the coupler.
- Visually confirm positive indication of the ISO Engagement indicator (3), if equipped.
- Retract the bucket cylinder and drag the work tool on the ground.
- Visually confirm that there is no movement between the work tool and the quick coupler.
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Illustration 5 g06222081
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| Illustration 3 | g02163290 |
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Back drag the work tool on the ground to ensure the quick coupler is properly locked. Do Not strike the work tool on the ground to ensure the quick coupler is properly locked. Striking the work tool on the ground will result in damage to the coupler cylinder. |
- To unlock the coupler, position the work tool so that it is slightly above the ground, with the front pin of the work tool higher than the rear pin of the work tool. If the work tool is a bucket, verify that the cutting edge is slightly higher than the bottom of the bucket.
- Move electric switch (1) to the UNLOCK position. Confirm that the buzzer is sounding with an intermittent pattern of one beep per second. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer.
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Illustration 7 g02163415 - Retract the bucket cylinder, ensuring that the work tool rear pin locking mechanism is unlocked. The rear of the quick coupler should be rotated away from the work tool. Place the work tool in a stable and safe position on the ground.
- Depress the electric momentary switch (2). Confirm that the buzzer is sounding with an intermittent pattern of two beeps per second. The work tool front pin locking mechanism will unlock. This locking mechanism will remain unlocked for 10 seconds.
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Illustration 8 g02163290 - Within the 10-second time period, retract the stick cylinder until the quick coupler is disengaged from the work tool. Ensure that the work tool is in a stable and safe storage position on the ground.
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Place the work tool or bucket in a safe position before disengaging the coupler. Disengaging the coupler will release the work tool or bucket from control of the operator. Serious injury or death may result from disengaging the work tool or bucket when it is in an unstable position or carrying a load. |
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Auxiliary hoses for work tools must be disconnected before the Hydraulic Quick Coupler is disengaged. Pulling the work tool with the auxiliary hoses could result in damage to the host machine or the work tool. |
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Always confirm that the buzzer sounds when the switch is in the unlock position. If no sound is heard while in this condition, ensure that the work tool is placed in a stable and safe position. Turn off the engine. Consult your Cat dealer. |
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| Illustration 6 | g02163292 |
Coupling a Bucket that is Reversed
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When some Cat 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. |
- Follow the same steps for coupling and uncoupling the work tool to operate the coupler with a bucket that is reversed. Refer to "Coupling the Work Tool" and "Uncoupling the Work Tool" for the proper procedure.
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| Illustration 9 | g02163425 |