FILTER AS 0813956 - Caterpillar

This Program must be administered as soon as possible. When reporting the repair, use "PI1357" 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 "PI1357" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Refer to the December 8, 1997 Parts Stock Service Letter PI7399.
This Revised Service Letter replaces the January 5, 1998 Service Letter. Changes have been made to step 6 of the Rework Procedure.
Problem
Introduction of the 131-2946 Accumulator Charge Valve has resulted in incorrect readings of nitrogen pre-charge pressure inside the accumulator. The 131-2946 Accumulator Charge Valve requires replacement with a 1521805/">152-1805 Valve. The new 1521805/">152-1805 Valve provides increased thread engagement in accumulator and a gas vent relief from both the cap and body if either the schrader valve leaks or the valve is removed from the accumulator without the nitrogen precharge being released.
Affected Product
Model & Identification Number
D25D (1HK645-697)
D30D (3AJ398-417)
D250E (5TN604-1353)
D300E (7FN337-733)
D350E (9LR146-446)
D400E (2YR224-733)
Any 131-2496 Valve acquired through the parts system and installed on any machine not listed above needs to be reworked.
Parts Needed
Dealers will need to order parts for this Program.
1 - 1521805 Valve Group (D25D, D250E, D300E, D350E & D400E)3 - 1521805 Valve Group (D30D Only)Action Required
See the attached proccedure.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
This is a 1-hour job. On D30D Articulated Trucks an additional .5 hours will be allowed.
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.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)(2-Rework Procedure)Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure
Lower suspension systems to the service position on D25D, D30D, D250E, D300E, D350E and D400E Trucks using procedure described in the relevent Operation and Maintenance Manuals.
The gas valve can blow out without warning if loosened while there is still nitrogen gas in the accumulator. This can cause personal injury. Do not attempt to remove the gas valve until all nitrogen gas pressure has been released.
The suspension system may drop the machine suddenly, leaving no clearance between the axle housing, main frame, tires and mud guards. Working in these areas can result in personal injury or death by crushing. Stay clear until the enigne is stopped and the suspension is lowered into the service position.
If the accumulator needs to be charged, be sure to use dry nitrogen only. Charging the accumulator with oxygen gas will cause an explosion. For charging procedures see the proper testing and adjustment procedure in the appropriate service literature for your machine.
1. Remove cap (Item 1).2. Loosen body section (Item 2) one and one half turns to back off taper seat (Item 3), while doing this, hold hex portion of main valve body to prevent the valve unscrewing from