- Multi-Processor:
- MP20 (S/N: ACF689-UP; ABS203-UP)
Introduction
This special instruction is a supplement to the Operation and Maintenance Manual, SEBU7466-06.
The Operation and Maintenance Manuals are available through the normal literature distribution system. These publications can also be found on the AVSpare Service Information System (SIS).
General Information
The multi-processor rotator can be overstressed if the multi-processor is not operated in a correct manner. To prevent operating practices that will damage the multi-processor, the following warning is located in the operation section of the Operation and Maintenance Manual.
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Observe the following precautions when cutting or breaking an object with the multi-processor:
Abuse of the multi-processor in this manner can overstress the rotator head bolts. The rotator head bolts can fail, disengaging the multi-processor from the host machine. A falling multi-processor can result in serious injury or death. |
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New maintenance procedures have been created in order to allow operators to check the rotator. The procedure titles are listed below. These procedures will help the operator identify a work tool that has been overstressed.
- Operation and Maintenance Manual, "Rotator Head Bolts - Check"
- Operation and Maintenance Manual, "Rotator Head Bolts - Inspect"
The content of these new procedures is available in the maintenance section of this special instruction.
Maintenance Section
Maintenance Interval Schedule
Every 10 Service Hours or Daily
- Rotator Head Bolts - Inspect
Every 100 Service Hours or 2 Weeks
- Rotator Head Bolts - Check
Rotator Head Bolts - Inspect
- Position the work tool in an upright position just above the ground.
- Stop the machine engine in order to prevent inadvertent movement of the work tool
Note: The host machine must be equipped with a boom lowering control valve in order to perform this procedure. If the host machine is not equipped with a boom lowering control valve, contact your Cat dealer.
- Check the rotator head bolts (2) on the outer ring. If any of the bolts are missing the heads, replace all the bolts on the outer ring.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.
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| Illustration 1 | g02158322 |
MP20 (2) Rotator head bolt (outer ring) | |
- Access the seven rotator head bolts (2a) on the inside of the frame.
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| Illustration 2 | g02158335 |
MP20 (2a) Rotator head bolts inside the frame | |
- Check the rotator head bolts (2a) on the inside of the frame. If any of the bolts are missing the heads, replace all the bolts on the outer ring.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.
- Remove the cover plate (1) and the bolts in order to gain access to the bolts on the inner ring.
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| Illustration 3 | g02157927 |
MP20 (1) Cover plate | |
- Check the rotator head bolts on the inner ring. If any of the bolts are missing the heads, replace all the bolts on the inner ring.
Note: The work tool can be rotated manually in order to access the 34 bolts on the inner ring. Use a sufficiently long lever in order to rotate the work tool.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.
- Install the cover plate (1) and the bolts.
Note: Do not operate the work tool while the cover plate (3) is removed. The cover plate (1) is part of an indicator function that identifies failure of the rotator head bolts in the inner ring.
The cover plate (1) has the following two functions:
- The cover plate (1) covers the hole
- The cover plate (1) functions as part of an indicator that identifies failure of the rotator head bolts in the inner ring.
A rotator head bolt may become broken or become loose in the inner ring. The rotator head bolt will fall into the hole that is covered by the cover plate (1). The cover plate (1) causes the rotator head bolt to remain in the hole.
The rotator head bolt that is in the hole will stop the rotation of the work tool.
Stop operating the work tool if the work tool will not rotate.
Inspect the rotator head bolts in the inner ring.
A rotator head bolt on the inner ring may become loose or missing. All the rotator head bolts and the washers in the inner ring must then be replaced.
Do not operate the work tool when the rotator is stalled. Structural damage to the work tool will occur.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.
Rotator Head Bolts - Check
- Position the work tool in an upright position just above the ground.
- Stop the machine engine in order to prevent inadvertent movement of the work tool.
Note: The host machine must be equipped with a boom lowering control valve in order to perform this procedure. If the host machine is not equipped with a boom lowering control valve, contact your Cat dealer.
- Remove the cover plate (1) and the bolts in order to gain access to the bolts on the inner ring.
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| Illustration 4 | g02157927 |
MP20 (1) Cover Plate | |
- Check the static inspection torque of all 34 rotator head bolts (2) on the inner ring. Use appropriate tooling in order to apply a torque that is specified in Table 1. Only one rotator head bolt will be accessible at a time through the inspection hole. Check all of the rotator head bolts on the inner ring of the rotator.
Show/hide table
Table 1 Static Inspection Torque Sales Model Bolt Size Torque Value MP20 M20 x 2.5 460 N·m (340 lb ft) Note: Rotate the work tool in order to access all the rotator head bolts on the inner ring.
Note: The rotator head bolt on the inner ring should not move before a torque that is specified in Table 1 is reached. If the rotator head bolt moves, then the sealant has been broken and the rotator head bolt has been overstressed. All rotator head bolts on the inner ring and the washers in the inner ring must then be replaced.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.
- Install the cover plate (1) and the bolts.
Note: Do not operate the work tool while the cover plate (1) is removed. The cover plate (1) is part of an indicator function that identifies failure of the rotator head bolts in the inner ring.
The cover plate (1) has the following two functions:
- The cover plate (1) covers the hole.
- The cover plate (1) functions as part of an indicator that identifies failure of the rotator head bolts in the inner ring.
A rotator head bolt may become broken or becomes loose in the inner ring. The rotator head bolt will fall into the hole that is covered by the cover plate (1). The cover plate (1) causes the rotator head bolt to remain in the hole.
The rotator head bolt that is in the hole will stop the rotation of the work tool.
Stop operating the work tool if the work tool will not rotate.
Inspect the rotator head bolts in the inner ring. Refer to, "Rotator Head Bolts - Inspect" for additional information.
A rotator head bolt on the inner ring may become loose or missing. All the rotator head bolts and the washers in the inner ring must then be replaced.
Do not operate the work tool when the rotator is stalled. Structural damage to the work tool will occur.
ReferenceContact your Cat dealer for replacement of the rotator head bolts.