PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE HOIST CYLINDER HEAD ASSEMBLY BOLTS ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE HOIST CYLINDER HEAD ASSEMBLY BOLTS ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS

Usage:

TEBE8704-01

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12Mar2019

(Revised 17Mar2019)

U-123

A-95

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Priority	PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE HOIST CYLINDER HEAD ASSEMBLY BOLTS ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS
7755 7562 5102 5576		PI32998

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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.

NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI32998" as the Part Number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. Exception: If the repair is done after failure, use "PI32998" as the Part Number, "7751" as the Group Number, "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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NOTE:	This Revised Service Letter replaces the 12Mar2019 Service Letter. Changes have been made to the Affected Product.

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COMPLETION DATE	TERMINATION DATE
30Sep2019	31Mar2020

PROBLEM

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The hoist cylinder head assembly bolts need replaced on certain 794 AC Off-Highway Trucks. The bolts may fail.

AFFECTED PRODUCT

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Model	Identification Number
794 AC	MN500055 MT500100-00101, 108-111

PARTS NEEDED

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Qty	Part Number	Description
18	8T4994	WASHER-HARD
101	4329990	WIRE-BULK (101 Centimeters)
18	4694770	BOLT-12 POINT HD
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 45% 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.

ACTION REQUIRED

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Prepare the machine for maintenance. Refer to SEBU9099, Operation and Maintenance Manual, "Prepare the Machine for Maintenance". Refer to Disassembly and Assembly UENR2271, "794 AC Off-Highway Truck Machine Systems" for bolt replacement.

1. Replace existing eighteen head bolts and washers with eighteen 469-4770 Bolts and eighteen 8T-4994 Washers.

2. Use the following procedure to tighten the 18 bolts in a crisscross pattern in three stages to ... 380 to 393 N.m (280 to 290 lb ft) lubed.
a) Tighten the bolt to 135 N.m (100 lb ft).
b) Again tighten the bolt to 271 N.m (200 lb ft).
c) Finally tighten the bolt to 380 to 393 N.m (280 to 290 lb ft).
d) Lock wire the bolts with 101 centimeters (39.8 inches) of 432-9990 Wire.

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OWNER NOTIFICATION

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Owners in the following countries will receive the attached Owner Notification:
US
Canada

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
100%	100%	0%	0%	0%	0%

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NOTE: This is a 4.0-hour job

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PARTS DISPOSITION

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

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

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EXAMPLE COPY OF OWNER NOTIFICATION

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE HOIST CYLINDER HEAD ASSEMBLY BOLTS ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS

MODELS INVOLVED - 794 AC OFF-HIGHWAY TRUCK

Dear Cat Product Owner:

The hoist cylinder head assembly bolts need to be replaced on the products listed below. The existing bolts can fail. You will not be charged for the service performed.

Contact your local Cat dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service.

If you are no longer the owner of this product(s), please contact your local Cat dealer so that our records can be updated. Please refer the dealer to their Service Letter dated 12Mar2019 when scheduling this service.

We regret the inconvenience this may cause you, and urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to 12Mar2019 Service Letter