PSP FOR STEERING CONTROL VALVE INSTABILITY ON CERTAIN D9N AND D10N TRACTORS - PS0473 - MAILED US AND CANADA, CACO, COFA, CFE L, COSA Caterpillar

PSP FOR STEERING CONTROL VALVE INSTABILITY ON CERTAIN D9N AND D10N TRACTORS - PS0473 - MAILED US AND CANADA, CACO, COFA, CFE L, COSA

Usage:

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Caterpillar: Confidential Yellow

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.