VIBRATORY GP 7R4470 - Caterpillar

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.
This Program must be administered as soon as possible. When reporting the repair, use "PI3172" 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 "PI3172" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Refer to your Warranty Bulletin for detailed information with regard to Product Improvement Programs.
Completion Date
January 31, 1999Termination Date
July 31, 1999Problem
Some of the 4N2572 Fan Spiders in 3406 Morbark Tub Grinder Engines are failing and need to be replaced. This is a 33 inch suction fan application.
Affected Product
Model & Identification Number
3406C (6TB7784, 6TB7862, 6TB8126, 6TB8192, 6TB8416, 6TB8418, 6TB8428, 6TB8638, 6TB9377 , 6TB9379, 6TB9381, 6TB9438, 6TB9442, 6TB9748, 6TB9810, 6TB9858, 6TB10320 , 6TB10488, 6TB10542, 6TB10545, 6TB10546, 6TB10565, 6TB10577, 6TB10578 , 6TB10646, 6TB10708, 6TB10716, 6TB12280, 6TB12284, 6TB12310, 6TB12631 , 6TB12638, 6TB12646, 6TB12653, 6TB12744, 6TB12797, 6TB12814, 6TB12899 , 6TB12902, 6TB12966, 6TB12987, 6TB13035, 6TB13362, 6TB13363, 6TB13365 , 6TB13539-13541, 6TB13756, 6TB14295, 6TB14320, 6TB14443, 6TB14527 , 6TB14860, 6TB14869, 6TB15109, 6TB15218, 6TB15242, 6TB15274-15277 , 6TB15287, 6TB15493, 6TB15494, 6TB15504, 6TB15564, 6TB15632 , 6TB15634, 6TB15636, 6TB15651-15654, 6TB16200 3ER556 , 3ER578, 3ER668, 3ER670, 3ER671, 3ER815, 3ER918, 3ER923, 3ER930, 3ER1000 , 3ER1001, 3ER1077, 3ER1129, 3ER1152, 3ER1240, 3ER1241, 3ER1265, 3ER1266 , 3ER1477-1480, 3ER1495, 3ER1564, 3ER1565, 3ER1577, 3ER1599, 3ER1605 , 3ER1612, 3ER1640, 3ER1706, 3ER1814, 3ER1815, 3ER1874, 3ER1875, 3ER1911 , 3ER1931, 3ER1940, 3ER1941, 3ER1943, 3ER2385, 3ER2416-2418, 3ER2661 , 3ER2820, 3ER2858, 3ER2861)
Parts Needed
1 - 1627530 Spider Assembly - FanAction Required
1. Remove the 4N2573 Fan Guard and the 4N2572 Fan Spider.2. Install a new 1627530 Fan Spider.3. Re-install the 4N2573 Fan Guard.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