PSP FOR INSTALLING A NEW CAMSHAFT AND LIFTERS IN CERTAIN D11N TRACTORS; 776B TRACTORS; AND 777B, 785 AND 789 TRUCKS - PS0423 - M AILED US AND CANADA, CACO, COFA, BRAZIL, COSA, LIMITED CFEL - NOTE:THIS PROGRAM CANCELED AND REPLACED BY JULY 31, 1990 SL Caterpillar

U-229
A-146
AU-148
B-36
E-98.1
O-141
1210, 1209  PS0423
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
"PS0423" as Part Number, "7755" as Group Number, and "96"
as Description Code.

December 31, 1991

The lobes on the camshafts may spall and cause damage to the valve lifters in
the engines of certain D11N Tractors; 776B Tractors; and 777B, 785, and 789
Trucks.

Model Identification Number
D11N 74Z1-Up
776B 6JC1-Up
777B 4YC1-Up
3NF1-Up
785  8GB1-Up
789  9ZC1-Up

***** D11N Tractors *****
1 - 7C0200 Camshaft (RH)
1 - 7C0201 Camshaft (LH)
24 - 9Y9587 Lifter Assembly
4 - 3P0647 Seal - Governor Drive
2 - 7N4320 Gasket - Rear
2 - 8N9885 Gasket - Front
1 - 8T2230 Seal - Accessory Drive Yoke
1 - 8N8089 Gasket - Trans Oil Cooler Lines
1 - 7N3368 Gasket - Trans Oil Cooler Lines
1 - 3K0360 Seal - Trans Oil Cooler Lines
3 - 3D2824 Seal - Trans Oil Cooler Lines
1 - 7M8485 Seal - High Speed Oil Change (use as required)
4 - 2M5173 Seal - Air Lines
1 - 7W2478 Gasket - Dust Ejector Tube
2 - 7J9108 Seal - Fuel Line
4 - 4J0522 Seal - Hydraulic Lines/Oil Lines
1 - 1P3704 Seal - Hydraulic Fan Lines
1 - 6V8260 Seal - Accessory Drive Yoke
3 - 8M5661 Seal - Convertor Oil Lines
2 - 8M8157 Seal - Convertor Oil Lines
2 - 8M4443 Seal - Convertor Oil Lines
1 - 8M5254 Seal - Convertor Oil Lines
2 - 8M4968 Seal - Convertor Oil Lines
1 - 8M4390 Seal - Convertor Oil Lines
2 - 3F5792 Seal - Auxiliary Rear Drive
1 - 8T7212 Seal - Hydraulic Oil Lines
1 - 2H6338 Seal - Hydraulic Oil Lines
1 - 1P3705 Seal - Hydraulic Oil Lines
These are the parts required to remove the engine from the tractor, make the
repair, and install the engine back in the tractor.
After a failure, both camshafts and all lifters should be replaced.
***** 776B Tractors and 777B Trucks *****
1 - 7C0200 Camshaft (RH) 1 - 7C0201 Camshaft (LH)
24 - 9Y9587 Lifter Assembly
2 - 8N9885 Gasket - Front
2 - 7N4320 Gasket - Rear
4 - 3P0647 Seal - Governor Drive
Use parts as required.
After a failure, both camshafts and all lifters should be inspected and
replaced as necessary. New lifters should be used with a new camshaft.
***** 785 Trucks *****
1 - 7C0194 Camshaft - Front (LH)
1 - 7C0195 Camshaft - Rear (RH)
1 - 7C0196 Camshaft - Front (RH)
1 - 7C0198 Camshaft - Rear (LH)
36 - 9Y9587 Lifter Assembly
2 - 8N9885 Gasket - Front
2 - 7N4320 Gasket - Rear
4 - 3P0647 Seal - Governor Drive
Use parts as required. Parts are for an in-chassis repair.
After a failure, all lifters and the other three camshafts should be
inspected and replaced as necessary. New lifters should be used with a new
camshaft.
***** 789 Trucks *****
1 - 7C0387 Camshaft - Rear (LH)
1 - 7C0385 Camshaft - Front (LH)
1 - 7C0360 Camshaft - Front (RH)
1 - 7C0382 Camshaft - Rear (RH)
48 - 9Y9587 Lifter Assembly
2 - 8N9885 Gasket - Front
2 - 7N4320 Gasket - Rear
4 - 3P0647 Seal - Governor Drive
Use parts as required. Parts are for an in-chassis repair.
After a failure, all lifters and the other three camshafts should be
inspected and replaced as necessary. New lifters should be used with a new
camshaft.

Replace the existing camshaft and valve lifters after a failure occurs.

Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(D/N) (Cost)  (C/L) (Sell)
***** D11N Tractors *****
0-6000 100% 35 0 35 0 0
6001-10000 33 1/3% 17.5 0 17.5 50% 35
10001- 33 1/3%* 0 0 0 50%* 70
16000
* Applies only to camshaft and lifters. No labor will be allowed when a
spalled camshaft is detected at overhaul.
***** 776B Tractors and 777B Trucks *****
0-6000 100% 15 0 15 0 0
6001-10000 33 1/3% 7.5 0 7.5 50% 15
10001- 33 1/3%* 0 0 0 50%* 30
16000
* Applies only to camshaft and lifters. No labor will be allowed when a
spalled camshaft is detected at overhaul.
***** 785 Trucks *****
0-6000 100% 17.5 0 17.5 0 0
6001-10000 33 1/3% 8.75 0 8.75 50% 17.5
10001- 33 1/3%* 0 0 0 50%* 35
16000
* Applies only to camshaft and lifters. No labor will be allowed when a
spalled camshaft is detected at overhaul.
***** 789 Trucks *****
0-6000 100% 20 0 20 0 0
6001-10000 33 1/3% 10 0 10 50% 20
10001- 33 1/3%* 0 0 0 50%* 40
16000
* Applies only to camshaft and lifters. No labor will be allowed when a
spalled camshaft is detected at overhaul.
NOTE: This is a 30 to 70-hour job.

Handle the parts in accordance with your Warranty Bulletin on
warranty parts handling.