PRODUCT SUPPORT PROGRAM FOR REPLACING THE PILOT PUMP IN THE MAIN HYDRAULIC PUMP ON CERTAIN 330C AND 345B II EXCAVATORS

Usage:

SEBE8718

March 29, 2004
D-73

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*before or* *after failure*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE PILOT PUMP IN THE MAIN HYDRAULIC PUMP ON CERTAIN 330C AND 345B II EXCAVATORS
5070 5073		PS41511

NOTE: This Program can be administered either before or after failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS41511" as the Part number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

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.

TERMINATION DATE

March 31, 2005

PROBLEM

The pilot pump in the main hydraulic pump needs to be replaced on certain 330C and 345B II Excavators. The pilot pump needs to be replaced due to premature wear at the splines, resulting in loss of drive connection. As a result, the machine becomes inoperable. The 1772481 Shaft has been replaced with the improved, hardened 2426775 Shaft.

AFFECTED PRODUCT

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Model

Identification Number

330C

MCA1-407

GKX1-153

JAB1-607

KDD1-542

345B II

AKJ1-199

AKX1-323

PARTS NEEDED

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Qty	Part Number	Description
1	2160025	Seal Kit
1	2426775	Shaft

Note: A 2160024 Pump Group ? Pilot should only be replaced, as needed, based on the inspection.

ACTION REQUIRED

See the attached Rework Procedure.

SERVICE CLAIM ALLOWANCES

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Product smu	Caterpillar		Dealer Suggested		Customer Suggested
Product smu	Parts	Labor Hrs	Parts	Labor Hrs	Parts	Labor Hrs
0-6000	100%	6	0	0	0	0
NOTE: This is a 6?hour job.

PARTS DISPOSITION

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

Attach. (1-Rework Procedure)

Rework Procedure

Replace the former 1772481 Shaft with a new 2426775 Shaft Following the procedures in Service Manuals, RENR5438 and RENR1935. Also replace 6V6228 O-Ring Seal, 5P8356 O-Ring Seal and 2H6184 Seal for pilot pump to new one. If the spline of pilot pump damaged, replace the 2160024 Pilot Pump Assembly with a new one.

Remove the hydraulic tank suction strainer and use 227-4683 seal cap to plug the tank outlet. Refer to the service manual.
Remove the main pump from the flywheel by disconnecting the hydraulic hoses and mounting bolts.
Place the main hydraulic pump on the ground. Remove the 216-0024 pilot pump from main pump. Refer to Illustration 1.
Remove the former 1772481 Pilot Pump Drive Shaft from main pump according to the service manual. The 4C5654 Tool Adapter that is introduced in service manual cannot be used. The length of the 4C5654 Adapter is too short to remove the former 1772481 Pilot Pump Drive Shaft.
It is necessary to fabricate a special longer adapter in place of 4C5654 Adapter based on Illustration 2. Use this special adapter, when removing former pilot pump drive shaft.
Remove a key from former shaft and install the key to new 2426775 Shaft. Install new 2426775 Shaft to main hydraulic pump after cooling down the shaft approximately ?40 Degree C with a liquid nitrogen or combined methyl alcohol and dry ice.

Note: Make sure the alignment of key in shaft with the slot in gear. Refer to the service manual.

Replace the 6V6228 O-Ring Seal, 5P8356 O-Ring and 2H6184 Seal to new one and install the pilot pump assembly to the main pump. Refer to Illustration 1.

Note: If splines of pilot pump drive shaft were severely worn out, it is necessary to check the condition of pilot pump. Disassemble the pilot pump and check for any damage. Replace the 2160024 Pilot Pump Assembly with new one if damaged.