PSP FOR STEERING CONTROL VALVE INSTABILITY ON CERTAIN D9N AND D10N TRACTORS - PS0473 - MAILED US AND CANADA, CACO, COFA, CFE L, COSA
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PSP FOR STEERING CONTROL VALVE INSTABILITY ON CERTAIN D9N AND D10N TRACTORS - PS0473 - MAILED US AND CANADA, CACO, COFA, CFE L, COSA
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.
U-162 A-110 AU-105 E-97 O-121 4300, 4307 PS0473 NOTE: 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 "PS0473" as Part Number, "7755" as Group Number, and "96" as Description Code.
Termination Date
August 31, 1991
Problem
Certain D9N and D10N Tractors equipped with a 6T1171 Steering Control Valve may experience intermittent neutralization of the transmission under certain operating conditions. This may be caused by instability of the steering clutch control valves.
Affected Product
Model Identification Number D9N 1JD1-2210 D10N 2YD1-1230
Parts Needed
4 - 9W5605 Retainers
Action Required
1. Follow the procedures in the Service Manual. Refer to the steering clutch and brake pressures for the correct settings. 2. Remove the 2-7T1114 and the 2-7T1116 Spool Assemblies from the steering control valve by removing the 4-7T1111 Plugs. The shims that control top pressures with the load springs will be found in the plugs. NOTE: Open and disassemble one valve assembly at a time to avoid mixing parts or assemblies. 3. Remove the 6L8598 Snap Ring and 6T8248 Washer from the end of each of the spool assemblies and install a 9W5605 Retainer in place of the washer. Shim to obtain 0.50 mm (.020") between the 9W5605 Retainer and the spring when the spring is in the free state. See Illustrations 1 and 2. 4. Install each valve on the body. Increase the shim pack for the load springs in the end plug to 11.7 mm (.046") thick. 5. When assembly is complete, check the steering clutch and brake controls for the correct pressures. See the Service Manual. NOTE: Do not exceed 12.7 mm (.500") stack height of the shims for the load springs. If necessary, remove shims from the opposite end. 6. Check for correct operation before returning to service. ****** IMAGE: SEBE4374.00001.001 CAPTION: Illustration 1 - Spool With Existing Washer ****** IMAGE: SEBE4374.00001.002 CAPTION: Illustration 2 - Spool With New Retainer
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Cost) (C/L) (Sell) 0-4000 100% 1 0 1 0 0 4001-6000 33 1/3% .5 0 .5 50% 1 NOTE: This is a 2-hour job.
Parts Disposition
Any parts removed (with the exception of cores used for Caterpillar Remanufactured parts) can be rendered useless and scrapped immediately upon completion of the repair.
Caterpillar Information System:
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