Product Support Program For Replacing The Brake Discs And Plates To Increase The Service LIfe On Certain 416B, 426B, 436B And 438B Backhoe Loaders 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 can only be administered after a failure occurs.The decision whether to apply the Program is made by the dealer.When reporting the repair, use "PS6126" as the Part Number and "7755" as the Group Number.Use "96" as the WarrantyClaim Description Code and use "Z" as the SIMS Description Code.

NOTE: This Revised Service Letter replaces the January 27, 1998 Service Letter.A change was made to the TERMINATION DATE.

Termination Date

Problem

The brake discs and plates need to be replaced for increased service life on certain 416B, 426B, 428B and 438B Backhoe Loaders. The brake discs and plates may not give desired service life. New brake discs and plates which have a wider wear path are now available to increase the service life.

Affected Product & Model Identification Number

416B (8SG1-14798)

426B (5YJ1-2378)

428B (7EJ1-9447)

438B (3KK1-3815)

Parts Needed

12 - 2B2006 Bolt

4 - 3J9196 Nut - Jam

8 - 9R9401 Disc - Rear Brake

1 - 551258 Housing Brake - Left (See note below)

1 - 551259 Housing Brake - Right (See note below)

8 - 1337234 Brake Plate

NOTE: If possible, machine the existing brake housings. Otherwise, replace with new housings.

Action Required

Dismantle the rear axle housing (refer to service manual D&A) to allow access to the brake components. Inspect both left hand and right hand brake housings for evidence of scoring on the disc running surface of the housing. It may be necessary to machine or replace 551258 Housing - Left Hand and 551259 Housing - Right Hand. If the housings are to be machined, maintain a maximum stock removal of 0.25mm (0.010 in.). The parts required to adapt the new brake plates and discs are shown in the 'Parts Needed' list above.

NOTE: This is a 12-hour job.

Parts Disposition

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