CYLINDER AS 9T6880 - 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 can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0817" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
February 29, 1996Problem
4I6446 Springs with date codes of 49L, 49M, 49O, 49P, 49S, 404, 405, 40D, 40L, 40M and 40Q are defective and need to be replaced on certain 307, 311, 312, 315, 315L, 320, 320L, 320N, 322, 322L, 325, 325L and 330 Excavators.Affected Product
Model & Identification Number
307 (2PM116-165, 2PM167-168, 2PM173-174)
311 (9LJ434-512, 9LJ514, 9LJ516, 9LJ525)
312 (6GK828-972, 6GK974-980, 6GK988)
315 (4YM283-293)
315L (6YM270, 6YM272-292, 6YM295, 6YM297, 6YM299-300, 6YM302, 6YM304-308, 6YM310-316, 6YM322)
320 (2DL526-6952DL698-7012DL703-705, 2DL707-709, 2DL732)
320L (9KK2626-2839, 9KK2841-2889, 9KK2891-2912, 9KK2916, 9KK2920, 9KK2922, 9KK2924-2927)
320N (1XM147)
322 (7WL241, 7WL242, 7WL257, 7WL258)
322L (8CL215)
325 (8NL150)
325L (9KL202-208)
330 (8RL188-204, 8RL206-220, 8RL116-165, 8RL167-168, 8RL173-174)
Parts Needed
2 - 4I6446 Spring Assembly4 - 950843 PinAction Required
See Rework Procedure.
Service Claim Allowances
This is a .5 hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Procedure)Rework Procedure
1. Park the machine on level ground. Swing the upper frame to the side.2. Remove the cab bottom guard that is under the travel control levers by removing the mounting bolts.3. Check date code of the spring using a light. See Illustration 1.4. If date code is other than shown on the list on page 1, replacement is not necessary. Install the cab bottom guard using the bolts and washers. If the date code on the 4I6446 Springs is: 49L, 49M, 49O, 49P, 49S, 404, 405, 40D, 40L, 40M or 40Q, take the following steps.5. Remove two 0950843 Cotter pins (see Illustration 1). Remove a 0951316 Pin and a 0994754 Pin, then remove the 4I6446 Spring Assembly and two 8T4224 Washers. Repeat on the other spring assembly. Discard the cotter pins.6. Install a new 4I6446 Spring Assembly using 0951316 and 0994754 Pins. Install two 8T4224 Washer and two 0950843 cotter pins.7. Install the bottom guard under the cab using the bolts and washers that were removed in step 2.
Illustration 1