Product Support Program For Replacing The Boom Pins On Certain 416B, 428B, And 438B Backhoe Loaders Caterpillar

Product Support Program For Replacing The Boom Pins On Certain 416B, 428B, And 438B Backhoe Loaders

Usage:

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Caterpillar: Confidential Yellow

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

NOTE: This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0720" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

NOTE: This Revised Service Letter Replaces the February 4, 1994 (Revised May 1994) Service Letter. A change was made to the Termination Date.

Termination Date

August 31, 1995

Problem

The boom pins can experience excessive wear on certain 416B, 428B, and 438B Backhoe Loaders. The wear may appear as galling on the pin and may result in a squeaking noise in the joint. The problem may exist on either the upper boom pin or lower boom pins, or on both sets of boom pins.

Affected Product
Model & Identification Number

416B (8ZK1-720 8SG1-4161 )

428B (7EJ1-1961)

438B (3KK1-889)

Parts Needed

Upper Boom Pin

2 9R0170 Sleeve Bearing^*

2 9R1494 Sleeve Bearing^*

1 9R8664 Pin

1 8T5001 Bolt

1 6V7687 Locknut

Lower Boom Pin

2 9R8583 Pin

2 9R9475 Sleeve Bearing^*

Use as required.

Action Required

See attached rework procedure

Service Claim Allowances

Upper Boom Pin

NOTE: This is a 3-hour job.

Lower Boom Pin

NOTE: This is a 4-hour job.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Attach.

(1-Rework Procedure)

Rework Procedure

NOTE: Before installing new pins, coat them liberally with 5P0960 Multipurpose Molybdenum Grease.

Replacing 9R8664 Pin (Upper Boom Pin)

1. Remove the 6V7744 Locknut and 8T5436 Bolt from the 9R8664 Pin. Refer to Illustration 1.

2. Remove the existing 9R8664 Pin.

3. Inspect the 9R8664 Pin and both 9R0170 Sleeve Bearings for damage.

NOTE: If the bore for the 9R0170 Sleeve Bearings is out of round more than .3 mm, use localized heating to reshape the bore. If this method does not work, bore the hole to a diameter of 68.5± 0.025 mm and install two new 9R1494 Sleeve Bearings in place of the two 9R0170 Sleeve Bearings.

4. Replace damaged 9R0170 Sleeve Bearings with new ones.

5. Install a new 9R8664 Pin along with the 6V7687 Locknut and 8T5001 Bolt.

NOTE: If the pin is being replaced, the diameter of the hole in the stick where the 8T5436 Bolt fit must be enlarged to 14 mm to accept the new 8T5001 Bolt. The 9R8664 Pin should have a 14mm diamater hole in it for the bolt. If the hole in the pin is less than 14 mm, enlarge it. Install the 9R8583 Pins with so that the grease hole faces the front of the machine.

Replacing 9R8583 Pins (Lower Boom Pins)

1. Remove both 6V7687 Locknuts and 8T5412 Bolts from the 9R8583 Pins. Refer to Illustrations 1 and 2.

2. Remove both existing 9R8583 Pins from the 9R8508 Boom Assembly.

3. Inspect both 9R8583 Pins and both 9R9475 Sleeve Bearings for damage.

4. Replace damaged 9R9475 Sleeve Bearings with new ones.

5. Install two new 9R8583 Pins along with both 6V7687 Locknuts and 8T5412 Bolts.

NOTE: If the boom joints continue to squeak after this rework, call 919-550-1412 to report the problem.

Illustration 1