Usage:
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 be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4151" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
August 31, 1998Problem
On certain Challenger 65D, 75C, 75D, 85C and 85D Tractors the main electrical circuit breaker may be overloaded even though there is no fault with the electrical system. This can happen when standard electrical items (lights, A/C, wipers, etc.) are operated at the same time as attachment lighting and auxiliary circuits. For tractors that have auxiliary lighting and are expected to use several of the auxiliary circuits, replace the original 80 amp circuit breaker (9S4693) with a 105 amp circuit breaker (3E7294).
Affected Product
Model & Identification Number
65D (2ZJ1965-2487)
75C (4KK2230-99999)
75D (5AR1-492)
85C (9TK1765-99999)
85D (4GR1-696)
Parts Needed
- 1 - 3E7294 Breaker Assembly
Action Required
See the attached rework procedure.
Service Claim Allowances
NOTE: This is a 0.5-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.
- (1-Rework Procedure)
Rework Procedure
Disconnect the battery before starting the rework procedure. At the front of the tractor, remove the radiator screen and disconnect the positive cable from all batteries in the battery compartment.
1. Remove the top from the electrical box located on the right hand frame rail.
2. Disconnect the wire terminals from the main power circuit breaker (1). See Illustration 1.
3. Remove the existing circuit breaker from the electrical box by removing screws (2). Save the screws and nonmetallic spacer (3) for reinstallation. See Illustration 2.
4. Install the new circuit breaker (3E7294) using the screws removed in Step 3. Be sure to reinstall the nonmetallic spacer between the circuit breaker and the box.
5. Reconnect the wire terminals to new circuit breaker and tighten to a torque of 6 ± 1 N·m (53 ± 9 lb in)
6. Reinstall the cover on the electrical box.
7. Connect the battery positive cable.
Illustration 1
Illustration 2