Usage:
NOTE: This Program must be administered as soon as possible. When reporting the repair, use "PI1416" 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 "PI1416" 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 June 13, 1999 Service Letter. Changes have been made to the Parts Needed and Rework Procedure.
Problem
The parking brake control group needs to be inspected on certain 69D, 769D, 771D, 773D, and 775D Trucks. These trucks may have been shipped from the factory with the 157-2714 Control Group-Brake assembled incorrectly. When the parking brake switch is placed in the 'ON' position, the parking brakes and front brakes are engaged. This is not correct; the front brakes should not engage when the parking brake switch is moved to the 'ON' position.
Affected Product
Model & Identification Number
69D (9XS69)
769D (5SS69-74, 5SS85-93, 5SS95-137, 5SS139)
771D (6YS71-102, 6YS105-107)
773D (7CS73-78, 7CS80, 7CS85, 7CS89, 7CS92-103)
775D (8AS75-86, 8AS88-93, 8AS95-127)
Parts Needed
Dealers will need to order parts for this Program.
- 1 - 3P1823 ADAPTER-PIPE
- 1 - SENR1555-01 (for 769D and 771D Trucks only)
- 1 - SENR1578-01 (for 773D and 775D Trucks only)
- 1 - SENR1555-01 (for 769D and 771D Trucks only)
Action Required
See the attached procedure.
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)
- (2-Rework Procedure)
Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure
1. Move the truck to a flat and level area. Raise the body and install body retaining pins. Engage parking brake. Stop engine. Open disconnect and lockout truck. Chock tires. Vent air pressure from air systems. Remove rear access panel from cab.
2. Refer to Photo #1. Locate rear area of cab to be reworked.
3. Refer to Photo #2. Remove 7D-2629 Hose Assembly with metal tag #7 (D). Remove 7D-2629 Hose Assembly with metal tag #8 (C). Remove 7J-8611 Elbow (E) and 2D-7325 Tee (A). Remove 6D-9718 Hose Assembly (B). These parts will be reused later in this procedure.
4. Refer to Photo #3. Assemble 7J-8611 Elbow (E). Assemble 7D-2629 Hose Assembly with metal tag #7 (D) to elbow. Assemble opposite end of hose #7 to fitting at location #7 of cab wall. Use 5P-3413 Pipe Sealant, or equivalent, as required.
5. Again, refer to Photo #3. Assemble 3P-1823 Adapter-Pipe (F) and 2D-7325 Tee (A). Assemble 7D-2629 Hose Assembly with metal tag #8 (C) to tee. Assemble opposite end of hose #8 to fitting at location #8 of cab wall. Assemble 6D-9718 Hose Assembly (B) to tee and inverter valve.
6. At this point, rework is complete. Test function of parking brake. Engage parking brake, air pressure delivered to front brake master cylinder should be 0 kPa (0 psi). Hydraulic pressure to port 'P' of rear brakes should be 0 kPa (0 psi).
7. Test function of secondary brake. With parking brake 'OFF', front brake switch 'ON', and secondary brake fully engaged, air pressure delivered to front brake master cylinder should be a minimum of 655 kPa (95 psi). At the same time, hydraulic pressure to port 'P' of rear brakes should be 0 kPa (0 psi).
8. Destroy all copies of SENR1555-00 (769D Off-Highway Truck and 771D Quarry Truck Air System And Brakes) and replace with SENR1555-01. Destroy all copies of SENR1578-00 (773D Off-Highway Truck and 775D Quarry Truck Air System And Brakes) and replace with SENR1578-01.