Product Support Program For Replacing The Camshaft On Certain D6H And D7H Tractors; 12G, 14G And 140G Motor Graders; D25C, D25D, D30C, D30D, D35C, D250B, D300B, D350C, And D350D Articulated Dump Trucks; Challenger 65 Tractors; 235C Excavators; 528 Sk Caterpillar

Product Support Program For Replacing The Camshaft On Certain D6H And D7H Tractors; 12G, 14G And 140G Motor Graders; D25C, D25D, D30C, D30D, D35C, D250B, D300B, D350C, And D350D Articulated Dump Trucks; Challenger 65 Tractors; 235C Excavators; 528 Sk

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Caterpillar: Confidential Yellow

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.

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 "PS0455" as Part Number, "7755" as Group Number, and "96" as Description Code.

NOTE: This Revised Service Letter replaces the August 30, 1990 Service Letter. Changes have been made to reflect the addition and removal of Affected Product. Mail Code TT-11 was removed.

Termination Date

August 31, 1992

Problem

The camshaft on certain D6H and D7H Tractors; 12G, 14G, and 140G Motor Graders; D25C, D25D, D30C, D30D, D35C, D250B, D300B, D350C, and D350D Articulated Dump Trucks; Challenger 65 Tractors; 235C Excavators; 528 Skidders; 615C, 627E, and 637E Scrapers; 815B and 816B Compactors; 966E Loaders; 973 Loaders; and 3306 Industrial Engines may pit and/or spall. Pitting or spalling can only cause the camshaft to wear faster than normal.

Affected Product
Model & Identification Number

D6H (4RC1-2581; 3ZF1-1375; 3YG1-555)

D7H (5BF1-890; 79Z1-2346; 80Z1-804)

12G (3WC1-1380; 61M1-13706)

14G (03L1-215; 96U1-7912)

140G (72V1-12892; 13W1-790)

D25C (9YC1 -1011)

D25D ( 1HK1-240)

D30C (7ZC1-257)

D30D (3AJ1-180, 3AJ183-183, 3AJ184-184)

D35C (2GD1-124)

D250B (5WD1-474)

D300B (4SD1-490)

D350C (8XC1-404)

D350D (9RF1-259)

CH65 (7YC1-1658)

235C (5AF1-985; 3WG1-555)

528 (96C1-735; 97C1-378)

615C (5TF1-394)

627E (6EB1-693; 6FB1-661; 6GB1-777)

637E (1FB1-489; 1HB1-550; 1JB1-695)

815B (17Z1-1157)

816B (15Z1-998)

966E (99Y5315-7164)

973 (86B1-1174)

3306 (7JB1-4275; 5KD1-2271)

Parts Needed

1 - 4P2942 Camshaft Kit

NOTE: Make sure the camshaft kit being used has been updated to include the new 7E6167 Cylinder Head Gasket. See the June 7, 1990 Service Letter - PI7237.

Action Required

Replace the existing camshaft and related components with the parts in the camshaft kit. When installing the cylinder head, make sure that the bolts are coated with 6V4876 Molykote.

Service Claim Allowances

NOTE: This is a 24-hour job.

Parts Disposition

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

Caterpillar Information System:

Service Letter Extension Service Letter Extension

SERVICE LETTER EXTENSION FOR JULY 21, 1989 SL - PSP FOR INCREASING THE NUMBER OF BOLTS TO STRENGTHEN THE JOINT BETWEEN THE TRANSFER GEAR GROUP AND COVER ON CERTAIN 518 SKIDDERS AND 518 GRAPPLE SKIDDERS - PS4371 - MAILED US AND CANADA, CACO, CFEL, CO SERVICE LETTER EXTENSION FOR JULY 21, 1989 SL - PSP FOR INCREASING THE NUMBER OF BOLTS TO STRENGTHEN THE JOINT BETWEEN THE TRANSFER GEAR GROUP AND COVER ON CERTAIN 518 SKIDDERS AND 518 GRAPPLE SKIDDERS - PS4371 - MAILED US AND CANADA, CACO, CFEL, CO

PSP FOR REBUILDING THE RESONATOR ASSEMBLY FOR THE POWERSHIP TRANSMISSION OF CERTAIN D4H TRACTORS - PS4525 - MAILED US AND CAN ADA, CACO, COFA, CFEL, COSA PSP FOR REBUILDING THE RESONATOR ASSEMBLY FOR THE POWERSHIP TRANSMISSION OF CERTAIN D4H TRACTORS - PS4525 - MAILED US AND CAN ADA, CACO, COFA, CFEL, COSA

PSP FOR REPAIRING STICKING VALVES IN THE AIR COMPRESSOR ON CERTAIN 12G, 120G, 130G, AND 140G MOTOR GRADERS; 518 SKIDDERS; AND 936E AND 950E LOADERS - PS4512 - MAILED US AND CANADA, COFA, CFEL, COSA PSP FOR REPAIRING STICKING VALVES IN THE AIR COMPRESSOR ON CERTAIN 12G, 120G, 130G, AND 140G MOTOR GRADERS; 518 SKIDDERS; AND 936E AND 950E LOADERS - PS4512 - MAILED US AND CANADA, COFA, CFEL, COSA

PRIORITY - THE CENTER DRIVE SHAFT BEARINGS NEED TO BE INSPECTED FOR CORRECT ADJUSTMENT ON CERTAIN 518 AND 528 SKI DDERS - PI3479 - MAILED US AND CANADA, CACO, COSA, LIMITED COFA PRIORITY - THE CENTER DRIVE SHAFT BEARINGS NEED TO BE INSPECTED FOR CORRECT ADJUSTMENT ON CERTAIN 518 AND 528 SKI DDERS - PI3479 - MAILED US AND CANADA, CACO, COSA, LIMITED COFA

Product Support Program For Replacing Failed Cylinder Head Gaskets On Certain D8L, D8N, D9N, And D10N Tractors; 16G Motor Graders; D35HP, D40D, D400, And D400D Articulated Dump Trucks; 245, And 245B Excavators; 589 Pipelayers; 621E 623E, 627E, 631E, Product Support Program For Replacing Failed Cylinder Head Gaskets On Certain D8L, D8N, D9N, And D10N Tractors; 16G Motor Graders; D35HP, D40D, D400, And D400D Articulated Dump Trucks; 245, And 245B Excavators; 589 Pipelayers; 621E 623E, 627E, 631E,

Product Support Program For Replacing Failed Cylinder Head Gaskets On Certain D8L, D8N, D9N, And D10N Tractors; 16G Motor Graders; D35HP, D40D, D400, And D400D Articulated Dump Trucks; 245, And 245B Excavators; 589 Pipelayers; 621E, 623E, 627E, 631E, Product Support Program For Replacing Failed Cylinder Head Gaskets On Certain D8L, D8N, D9N, And D10N Tractors; 16G Motor Graders; D35HP, D40D, D400, And D400D Articulated Dump Trucks; 245, And 245B Excavators; 589 Pipelayers; 621E, 623E, 627E, 631E,

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

Product Support Program For Installing A New Camshaft And Lifters In Certain D11N Tractors; 776B Tractors; And 777B, 785, And 789 Trucks Product Support Program For Installing A New Camshaft And Lifters In Certain D11N Tractors; 776B Tractors; And 777B, 785, And 789 Trucks

SERVICE LETTER EXTENSION FOR JUNE 14, 1989 SL - PSP FOR TRACK JOINT FAILURE (LEAKS) ON D8L, D9L, AND D10 TRACTORS - PS0381 - MAI LED CACO SERVICE LETTER EXTENSION FOR JUNE 14, 1989 SL - PSP FOR TRACK JOINT FAILURE (LEAKS) ON D8L, D9L, AND D10 TRACTORS - PS0381 - MAI LED CACO

PARTS STOCK ACTION ONLY - THE BEARING ASSEMBLY ON CERTAIN 6Y8997 BEVEL GEAR GROUPS MAY HAVE BEEN DAMAGED AS A RESULT OF PAC KAGING METHODS - PI7245 - MAILED US AND CANADA, CACO, COFA, BRAZIL, CFEL, COSA PARTS STOCK ACTION ONLY - THE BEARING ASSEMBLY ON CERTAIN 6Y8997 BEVEL GEAR GROUPS MAY HAVE BEEN DAMAGED AS A RESULT OF PAC KAGING METHODS - PI7245 - MAILED US AND CANADA, CACO, COFA, BRAZIL, CFEL, COSA

PSP FOR FAILED ONE-WAY CLUTCH COMPONENTS ON 988B LOADERS EQUIPPED WITH 2Z0989, 2X8670, 2Z8786, 2Z8858, 2Z8859 OR 2Z8860 LOC K-UP CONVERTER ARRANGEMENTS - PS0465 - MAILED US AND CANADA, COSA, LIMITED COFA PSP FOR FAILED ONE-WAY CLUTCH COMPONENTS ON 988B LOADERS EQUIPPED WITH 2Z0989, 2X8670, 2Z8786, 2Z8858, 2Z8859 OR 2Z8860 LOC K-UP CONVERTER ARRANGEMENTS - PS0465 - MAILED US AND CANADA, COSA, LIMITED COFA

PSP FOR REPLACING CRACKED HYDRAULIC TANK HEAD ASSEMBLY ON CERTAIN 988B LOADERS - PS4495 - MAILED US AND CANADA, CACO, COF A, BRAZIL, CFEL, COSA PSP FOR REPLACING CRACKED HYDRAULIC TANK HEAD ASSEMBLY ON CERTAIN 988B LOADERS - PS4495 - MAILED US AND CANADA, CACO, COF A, BRAZIL, CFEL, COSA

PSP FOR REPLACING THE TRANSMISSION CONTROL GROUP (SHIFT HANDLE) ON CERTAIN 910E LOADERS AND 1T12B INTEGRATED TOO LCARRIERS - PS4465 - MAILED USAND CANADA, CACO, CFEL, COSA PSP FOR REPLACING THE TRANSMISSION CONTROL GROUP (SHIFT HANDLE) ON CERTAIN 910E LOADERS AND 1T12B INTEGRATED TOO LCARRIERS - PS4465 - MAILED USAND CANADA, CACO, CFEL, COSA

PSP FOR INSTALLING NEW TURBOCHARGERS ON CERTAIN 789 TRUCKS AND 3516 ENGINES (SPARE) - PS4472 - MAILED US AND CANADA, COFA, LIM ITED CACO, LIMITED COSA, LIMITED CFEL PSP FOR INSTALLING NEW TURBOCHARGERS ON CERTAIN 789 TRUCKS AND 3516 ENGINES (SPARE) - PS4472 - MAILED US AND CANADA, COFA, LIM ITED CACO, LIMITED COSA, LIMITED CFEL

PSP FOR REPLACING THE DRIVE SHAFT BEARING SUPPORT GREASE FITTING ON CERTAIN IT12B AND IT14B INTEGRATED TOOLCARRIERS; AND 910E LOADERS - PS4513 - MAILED US AND CANADA, CFEL, COSA, LIMITED COFA PSP FOR REPLACING THE DRIVE SHAFT BEARING SUPPORT GREASE FITTING ON CERTAIN IT12B AND IT14B INTEGRATED TOOLCARRIERS; AND 910E LOADERS - PS4513 - MAILED US AND CANADA, CFEL, COSA, LIMITED COFA

New Boot And Rod Need To Be Installed On The Parking Brake Valve Of Certain D6H Tractors New Boot And Rod Need To Be Installed On The Parking Brake Valve Of Certain D6H Tractors

SERVICE LETTER SUPPLEMENT FOR FEBRUARY 20, 1990 SL - PSP FOR INSTALLING NEW ROLLERS IN THE ONE-WAY CLUTCH OF CERTAIN 56H WIN CHES - PS4418 - MAILED US, CANADA, CACO, COFA, CFEL, COSA SERVICE LETTER SUPPLEMENT FOR FEBRUARY 20, 1990 SL - PSP FOR INSTALLING NEW ROLLERS IN THE ONE-WAY CLUTCH OF CERTAIN 56H WIN CHES - PS4418 - MAILED US, CANADA, CACO, COFA, CFEL, COSA

SERVICE LETTER SUPPLEMENT FOR JUNE 27, 1989 SL - PSP FOR EXCESSIVE AIR SIDE PLUGGING OF FOLDED CORE RADIATORS IN CER TAIN D6H, D7H, D8N TRACTORS; AND 966D, 966E LOADERS - PS0390 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA SERVICE LETTER SUPPLEMENT FOR JUNE 27, 1989 SL - PSP FOR EXCESSIVE AIR SIDE PLUGGING OF FOLDED CORE RADIATORS IN CER TAIN D6H, D7H, D8N TRACTORS; AND 966D, 966E LOADERS - PS0390 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA

SERVICE LETTER SUPPLEMENT FOR JUNE 10, 1989 SL - PSP FOR EXCESSIVE AIR SIDE PLUGGING OF FOLDED CORE RADIATORS IN CER TAIN IT18, IT18B, 1T28, 1T28B TOOLCARRIERS; AND 916, 926 - 926E LOADERS - PS0391 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA SERVICE LETTER SUPPLEMENT FOR JUNE 10, 1989 SL - PSP FOR EXCESSIVE AIR SIDE PLUGGING OF FOLDED CORE RADIATORS IN CER TAIN IT18, IT18B, 1T28, 1T28B TOOLCARRIERS; AND 916, 926 - 926E LOADERS - PS0391 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA

PARTS STOCK ACTION ONLY - CERTAIN 9N1547 BEARINGS NEED TO BE REMOVED FROM PARTS STOCK - PI7253 - MAILED US AND CANADA, CACO, CO FA, BRAZIL, CFEL, COSA PARTS STOCK ACTION ONLY - CERTAIN 9N1547 BEARINGS NEED TO BE REMOVED FROM PARTS STOCK - PI7253 - MAILED US AND CANADA, CACO, CO FA, BRAZIL, CFEL, COSA

PSP FOR REWORKING AND UPDATING THE WINCH ON CERTAIN 518 SKIDDERS - PS4458 - MAILED US AND CANADA PSP FOR REWORKING AND UPDATING THE WINCH ON CERTAIN 518 SKIDDERS - PS4458 - MAILED US AND CANADA

SERVICE LETTER SUPPLEMENT FOR OCTOBER 2, 1990 SL - PSP FOR REWORKING AND UPDATING THE WINCH ON CERTAIN 518 SKIDDERS - PS4 458 - MAILED US AND CANADA SERVICE LETTER SUPPLEMENT FOR OCTOBER 2, 1990 SL - PSP FOR REWORKING AND UPDATING THE WINCH ON CERTAIN 518 SKIDDERS - PS4 458 - MAILED US AND CANADA

PSP FOR INSTALLING AN ENGINE OVERSPEED WARNING SYSTEM ON D11N TRACTORS - PS4505 - MAILED US AND CANADA, COFA, CFEL, COSA, LIM ITED CACO PSP FOR INSTALLING AN ENGINE OVERSPEED WARNING SYSTEM ON D11N TRACTORS - PS4505 - MAILED US AND CANADA, COFA, CFEL, COSA, LIM ITED CACO