SEAL ASSEM. 7P6747 - Caterpillar

REBE6751-01
17Dec2010
(Revised 04Jan2011)
U-505
A-416
D-442
Parts stock action only
PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE COOLANT FLOW SWITCH ON CERTAIN 3524 REMAN ENGINES IN DEALER PARTS STOCK, FOR 797B OFF-HIGHWAY TRUCKS
1408 7601 7610 7620 PI70372
When submitting claim for Parts Stock Action, Use the appropriate 99Z as the s/n, the appropriate Service Letter Program Number as the Part number in the Part Causing Failure field, "7751" as the Group Number, "56" as the Description Code.
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.
This Revised Service Letter replaces the 17Dec2010 Service Letter. Changes have been made to Action Required and Rework Procedure.
TERMINATION DATE
31Mar2011
PROBLEM
The existing coolant flow switch can fail on certain 3524 Reman Engines for 797B Off-Highwy Trucks. If the existing coolant flow switch fails, it can cause a false alarm/indicator when the truck is running.
ACTION REQUIRED
Rework the listed 3524 engines in dealer stock to include updates according to the attached Rework Procedure. Based upon application the engine arrangement part number is either 10R-1676 or 10R-7929.
Engines requiring rework:
NPM00229-00230, NPM00232-00241, NPM00243-00259, NPM00261-00308, NPM00310-00311, NPM00313-00314
1. Remove the existing coolant flow switch and install the 218-3840 Coolant Pressure Sensor and associated parts.
2. Update the engine and VIMS software.
Refer to the attached Rework Procedure.
SERVICE CLAIM ALLOWANCES
3.0 hours will be allowed for each engine in dealer parts stock that is reworked according to this program.
Submit one claim for all engines reworked in dealer parts stock.
PARTS DISPOSITION
Handle parts in accordance with your Warranty Bulletin on warranty parts handling.
Rework Procedure
1. Refer to Image 1.1.1 for the list of parts needed.
Image1.1.1
2. Drain the coolant. Remove the pipe plug from the coolant pressure sensor port and install the 3E-7448 Adapter, 6V-9027 O-ring Seal, and new 218-3840 Sensor at the location shown in Image 1.2.1.
Image1.2.1