Product Improvement Program For Replacing The Isolation Transformer On Certain 3508, 3512, And 3516 Engines Powering SR4B Generators 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 must be administered as soon as possible. When reporting the repair, use "PI3881" 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 "PI3881" 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

Termination Date

Problem

The 1248474 Transformer Assembly used on medium voltage SR4B Generators may cause a loss of sensing voltage as a result of insulation deterioration between the primary coil leads and the coil face.

Affected Product
Model & Identification Number

3508 (23Z6192, 23Z6295)

3512 (8RM107 24Z6512 , 24Z6518, 24Z6566, 24Z6598, 24Z6599, 24Z6600, 24Z6618, 24Z6622 , 24Z6624, 24Z6641, 24Z6652, 24Z6744, 24Z6745, 24Z6749, 24Z6891 , 24Z6906, 24Z6985, 24Z6988, 24Z6996)

3516 (25Z4584, 25Z4589, 25Z4591, 25Z4604, 25Z4644, 25Z4658, 25Z4735, 25Z4738 , 25Z4742, 25Z4773, 25Z4793, 25Z4794, 25Z4797, 25Z4798, 25Z4802 , 25Z4889, 25Z4918, 25Z4928, 25Z4931, 25Z4967, 25Z4979 7RN198 , 7RN245, 7RN254-260, 7RN288-290 5SJ313-315 , 5SJ320, 5SJ362, 5SJ368, 5SJ369, 5SJ372, 5SJ385, 5SJ386, 5SJ410, 5SJ422-426 , 5SJ428, 5SJ429 4XF590 , 4XF592, 4XF608-611, 4XF613, 4XF614 4EK494 , 4EK671, 4EK672, 4EK698)

GENERATORS (2FN556 8NN501 )

Parts Needed

2 - 1365057 Transformer Assembly

Action Required

Parts Stock

Remove all 1248474 Transformers from Parts Stock.

Affected Product

Replace the 1248474 Isolation Transformer with the 1365057 Isolation Transformer. There are two transformers on each generator and are located inside the terminal box.

Owner Notification

U.S. and Canadian owners will receive the attached Owner Notification.

Service Claim Allowances

Parts Stock

Submit one claim for all 1248474 Transformers removed from Parts Stock.

Affected Product

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)

Copy Of Owner Notification For U.S. And Canadian Owners