INSULATOR 6N3279 - Caterpillar

Caterpillar: Confidential Yellow
This Program must be administered as soon as possible. When reporting the repair, use "PI3386" as the Part number and "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 "PI3386" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Completion Date
June 30, 2000Termination Date
January 31, 2001Problem
Some 3306 and 3406 Generator Sets may fail the droop circuit board which could cause KVAR imbalance when synchronized with another supply. This could lead to a reverse VAR situation on the genset and subsequent heat damage to the generator.
Affected Product
Model & Identification Number
3306B (8NS2403-2407, 8NS2377, 8NS2467, 8NS2494, 8NS2520, 8NS2558, 8NS2563-2567, 8NS2569, 8NS2582, 8NS2600-2601, 8NS2624-26258NS2628, 8NS2639)
3406C (9ES2311-2315, 9ES2321-2323, 9ES2327-2332, 9ES2342, 9ES2377, 9ES2390, 9ES2392, 9ES2394, 9ES2420, 9ES2422, 9ES2428-2429, 9ES2432, 9ES2434, 9ES2448, 9ES2451, 9ES2455-2457, 9ES2459-2461, 9ES2463-2464, 9ES2467-2468, 9ES2482, 9ES2488, 9ES2492-2494, 9ES2496, 9ES2511, 9ES2515-2516, 9ES2523-2524, 9ES2533, 9ES2535, 9ES2540, 9ES2555-2557, 9ES2560, 9ES2560, 9ES2562-2563)
Parts Needed
No parts are needed to complete this program.
Action Required
This rework applies to 3306 and 3406 Generator Sets that have been fitted with the analog voltage regulator and 143-6906 droop kit mounting sub-assembly. The 178-3577 potentiometer in the droop controller has been fitted incorrectly. The potentiometer has been located directly behind the circuit board and can cause a short circuit situation and fail droop circuit capability.
Rework:
1. Remove the right access cover of the generator terminal box and the front access panel covering access to the voltage regulator. Removal of these two covers will gain access to the droop potentiometer and printed circuit board. At this point it can be visually identified that the potentiometer. is mounted directly behind the circuit board.2. Loosen the circuit board by pinching the four locking tabs securing the circuit board and pulling it back away from the mounting panel. Remove the potentiometer by loosening the mounting nut and relocate the potentiometer to the same size hole approximately 100mm directly below initial location. The hole closest to the voltage regulator is the correct location.3. Replace the circuit board on to the four locking tabs and secure in position.4. Replace two access cover panels and return unit to service.Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
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)Copy Of Owner Notification For U.S. And Canadian Owners