GUARD GP-ROCK 8E9570 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR BRAKE PEDAL RETURN SPRING FAILURES ON 416, 426, 428 BACKHOE LOADERS - MAILED US AND CANADA, CACO, COFA, CFEL, COSA
  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.
PRODUCT SUPPORT PROGRAM FOR BRAKE PEDAL RETURN SPRING FAILURES ON 416, 426 AND 428 BACKHOE LOADERS, 4269, PS0319 U-156 A-72 AU-94 E-68 O-88 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 "PS0319" as Part Number and "7755" as Group Number. Although products are to be administered as described above, parts stock should be purged immediately. Termination Date
November 30, 1988
Problem
The brake pedal return springs on some 416, 426 and 428 Backhoe Loaders may break. If the springs break, the pedals will not return to their normal position.
Affected Product
Model Identification Number 416 5PC1 - 4972 426 7BC1 - 1334 428 6TC1 - 1644
Parts Needed
2 - 9R6050 Spring 2 - 9R4464 Rod 4 - 9R6051 Washer 2 - 8T2335 Elbow 2 - 8T6663 Adapter
Action Required
Parts Stock Remove all 9R1710 and 9R1711 Springs and 9R2918 Rods from parts stock. Affected Product See the attached procedure. WARRANTY ALLOWANCES Submit one claim for all 9R1710 and 9R1711 Springs and 9R2918 Rods removed from parts stock. (SEE ILLUSTRATION)
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. Attach. (1 - Brake Rework Procedure) Brake Rework Procedure 1. Remove the front floor plate assembly. 2. Disconnect the existing 9R2918 Linkage Rods at the rod ends. Remove the rod ends from the linkage rods. 3. Disconnect the wires for the brake switches. Mark the wires to make assembly easier. 4. Remove the three mounting bolts, the bracket assembly and pedal assemblies. 5. Remove the 9R1710 and 9R1711 Springs (pedal return springs) and the two bolts and washers that hold them in place. 6. Install the two 8T6663 Adapters and 8T2335 Elbows between the two 9R2538 Tube Assemblies and the two hose assemblies in the steering lines group. Install the adapters on the ends of the tube assemblies. The new parts will provide clearance for the new springs. See Illustration 1. 7. Reassemble the pedal assemblies and bracket assembly and install them with the three mounting bolts. 8. Install the 8T5063 Rod Ends (bottom) on the ends of the new 9R4464 Linkage Rods until the ends of the rods are flush with the inside of the rod end. 9. Install the locknuts and 8T4815 Rod Ends (top). Adjust the top rod ends until there is 290.5 mm (11.44") between the centerlines of the pin holes. Tighten the locknuts. 10. Remove the bottom rod ends. 11. Install the rod assemblies down through the