Before/After
| PRODUCT SUPPORT PROGRAM FOR REWORKING THE FRONT AND REAR BRAKE COOLING LINES GP TEMPERATURE SENSOR SPACER FLANGES ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS |
4257 0618 5057
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PS45398 |
NOTE: |
Caterpillar’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to Caterpillar.
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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 "PS45398" 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. |
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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NOTE: |
This Revised Service Letter replaces the 24Feb2017 Service Letter. Changes have been made to the Service Claim Allowances. |
The existing temperature sensor flanges with included long adapter fitting will not allow the sensor probe to be immersed in the brake cooling oil flow causing inaccurate temperature measurement on certain 794 AC Off-Highway Trucks. If the specific front left or right wheel and rear left or right wheel brakes are dragging and potentially failing, the oil temperature measurement may not get high enough to warn the operator of the specific brake failure. |
Qty |
Part Number |
Description |
4 |
1P4584 |
FLANGE-SPLIT |
8 |
7X0326 |
BOLT |
8 |
7X2549 |
BOLT-HEX HEAD |
4 |
8T0568 |
SEAL-O-RING |
2 |
2147568 |
SEAL-O-RING-STOR |
4 |
2343544 |
SEAL-O-RING |
2 |
5156613 |
FLANGE |
2 |
5156614 |
FLANGE |
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 initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.
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Refer to Special Instructions Media # M0077646 and Service Magazine Media # M0077652 for rework instructions. Rework the front and rear brake cooling lines routings by removing the existing spacer flanges and long adapter fittings that house the temperature sensor and replace with new spacer flanges that allow the temperature sensor be mounted directly on the flange spacer. This change will allow the sensor probe to be immersed in the oil stream for a more accurate temperature measurement. |
Product smu/age whichever comes first |
Caterpillar |
Dealer Suggested |
Customer Suggested |
Parts % |
Labor Hrs% |
Parts % |
Labor Hrs% |
Parts % |
Labor Hrs% |
0-30000 hrs, 0-48 mo |
100.0% |
100.0% |
0.0% |
0.0% |
0.0% |
0.0% |
NOTE: This is a 3.0-hour job
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Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. |
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