The EPTC-II Controls Need To Be Replaced On 793C Trucks Caterpillar

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 must be administered as soon as possible. When reporting the repair, use "PI3055" as the Part Number, "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 "PI3055" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

NOTE: This Revised Service Letter replaces the August 28, 1997 Service Letter. Changes have been made to the Parts Needed and Action Required.

Completion Date

Termination Date

Problem

It is possible that the initial movement of the hoist lever will either not raise the body, nor actuate the body raised reverse neutralize control or, the body will continue to raise after the hoist lever is returned to the hold position. Other problems include speedometer flicker while the machine is stationary and invalid fault codes being logged. A new control module needs to be installed which will allow hoist lever movement to more closely match the response of the hoist lever with the mechanical system.

Affected Product
Model & Identification Number

793C (4AR77-236)

Parts Needed

1 - 1465821 Cont. Gp.

1 - 1108388 Film

Action Required

Remove screws holding center console cover and pull center console cover to the side being carefull to not to pull any wires loose from the switches attatched to the console cover.

Remove 4 bolts holding the existing EPTC-II Control module into the rear of the console. Lift EPTC-II Control and disconnect harness connectors at the EPTC-II Control.

Remove mounting brackets from existing EPTC-II Control and reuse them on the new EPTC-II Control.

Install 146-5821 EPTC-II Control into console and replace cover on console.

Test truck for proper operation before returning to service.

Owner Notification

U.S. and Canadian owners will receive the attached Owner Notification.

Service Claim Allowances

NOTE: This is a 1-hour job.

NOTE: U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.

Parts Disposition

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

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

Attach.

(1-Owner Notification)

Copy Of Owner Notification For U.S. And Canadian Owners