PRODUCT SUPPORT PROGRAM FOR REPLACING THE BOLTS AT THE APRON TRUNION JOINTS ON CERTAIN 621G, 627G, 631G, AND 637G WHEEL TRACTOR-SCRAPERS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE BOLTS AT THE APRON TRUNION JOINTS ON CERTAIN 621G, 627G, 631G, AND 637G WHEEL TRACTOR-SCRAPERS

Usage:

REBE2912-00

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05Nov2007

U-557

A-455

D-452

O-484

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*Before/After*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE BOLTS AT THE APRON TRUNION JOINTS ON CERTAIN 621G, 627G, 631G, AND 637G WHEEL TRACTOR-SCRAPERS
6202		PS42545

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NOTE:

This Program must be administered either before or after failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS42545" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. If administered after failure, use "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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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.

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TERMINATION DATE

30Nov2009

PROBLEM

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The existing apron trunion joints can fail due to improperly tightened bolts on certain 621G, 627G, 631G, and 637G Wheel Tractor-Scrapers. If the existing bolts fail, it can cause the apron to disconnect from the bowl.

AFFECTED PRODUCT

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Model	Identification Number
*****Group 1*****
621G	DBB00200-00340, 342-343, 345-350, 352-593
627G	DBD00250-00417, 419-785

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*****Group 2*****
631G	DFA00125-00330
637G	DFJ00225-00356

PARTS NEEDED

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Qty	Part Number	Description
*****Group 1*****
4	7X0388	BOLT
16	8T4223	WASHER-HARD
16	2411855	BOLT-HEX HEAD
In Order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 7% of dealership population. This is an inital order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.
*****Group 2*****
4	7X0388	BOLT
16	8S9092	BOLT
16	8T4122	WASHER-HARD
In Order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 7% of dealership population. This is an inital order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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Refer to the attached Rework Procedure.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
*****Group 1*****
0-2000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

NOTE: This is a 2.0-hour job for Group 1

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
*****Group 2*****
0-2000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

NOTE: This is a 2.0-hour job for Group 2

PARTS DISPOSITION

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

Rework Procedure

Group Number 1

1. Remove apron and trunions according to the apron disassembly & assembly manual.
2. The end-cap bolts and trunion hardware will not be reused.
3. Clean threads and mating surfaces of oil, paint, and other foreign material.
4. When installing new bolts, apply 4C-4030 Thread-Lock to bolt threads.
5. Install trunions to bowl sides.
6. Tighten the trunion bolts to a torque of 125 +/- 15 Nm.
7. Reinstall apron to trunions according to the D&A manual.
8. Tighten the end-cap bolts to a torque of 750 +/- 90 Nm.

Group Number 2

1. Remove apron and trunions according to the apron disassembly & assembly manual.
2. The end-cap bolts and trunion hardware will not be reused.
3. Clean threads and mating surfaces of oil, paint, and other foreign material.
4. When installing new hardware, apply 4C-4030 thread-lock to bolt threads.
5. Install trunions to bowl sides.
6. Tighten the trunion bolts to a torque of 270 +/- 25 Nm.
7. Reinstall apron to trunions, according to D&A manual.
8. Tighten the end-cap bolts to a torque of 750 +/- 80 Nm.