PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE SWING STEM ON CERTAIN 365B L EXCAVATORS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE SWING STEM ON CERTAIN 365B L EXCAVATORS

Usage:

SEBE8030

June 26, 2002
U-139
A-102
O-115

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*Priority*	PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE SWING STEM ON CERTAIN 365B L EXCAVATORS
5051		PI30310

NOTE: This Program must be administered as soon as possible. When reporting the repair, use "PI30310" as the Part number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI30310" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "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.

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COMPLETION DATE	TERMINATION DATE
December 31, 2002	June 30, 2003

PROBLEM

The swing stem (spool) needs to be replaced on 365B L Excavators. Due to the swing stem design, high peaks of pressure can occur in the swing circuit especially during swing start up in modulation. This can cause failures of hoses, tubes and the swing pump. A new swing stem has been released to avoid the pressure peaks and swing circuit failures.

AFFECTED PRODUCT

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Model	Identification Number
365B L	9TZ1-537 9PZ1-499

PARTS NEEDED

1 - 2206429 STEM

ACTION REQUIRED

See the attached Rework Procedure.

OWNER NOTIFICATION

U.S. and Canadian owners will receive the attached Owner Notification.

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts	Labor Hrs.	Parts	Labor Hrs.	Parts	Labor Hrs.
100%	2.0	0	0	0	0
NOTE: This is a 2.0- hour job. NOTE: U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report

PARTS DISPOSITION

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

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

Attach. (1-Owner Notification)
(2-Rework Procedure)

COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - REPLACE THE SWING STEM

MODELS INVOLVED - CERTAIN 365B L EXCAVATORS

Dear Caterpillar Product Owner:

A new swing stem needs to be installed on the products listed below. Due to the swing stem design, high peaks of pressure can occur in the swing circuit especially during swing start up in modulation. This can cause failures of hoses, tubes and the swing pump. A new swing stem has been released to avoid the pressure peaks and swing circuit failures. You will not be charged for the service performed.

Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service. Please refer the dealer to their Service Letter dated June 26, 2002 when scheduling this service.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)
Attached to June 26, 2002 Service Letter

Rework Procedure

Park the machine on level ground.
Lower the bucket to the ground with the stick in vertical position.
Create a vacuum in the hydraulic tank to minimize oil loss.
The Swing Valve does not need to be removed from the machine. The Swing Stem can be replaced on the machine. However, please refer to the RENR1970 "Disassembly & Assembly", section "Swing Control Valve Remove" for information on removing the Swing Stem.
No specific setting/calibration is needed after this Swing Stem replacement.
If the new stem does not fit into the Swing Valve Body, please contact your Product Support at the Caterpillar Plant.

In a very few cases a Specific Swing stem could be needed for a specific machine.

After replacing the Stem, test the machine in swing operation:

Hydraulic oil temperature between 122°F ? 140°F (50°C ? 60°C).
On horizontal ground, test the swing action, start up in modulation, full speed, stop action.
On a slope, test the swing action, start up in modulation, full speed, stop action. And especially test if there is any excessive swing drift with machine in stand by position, all joysticks in neutral position and with the Hydraulic Activation Control Lever in "unlocked" position.

In case of any problems, please contact your Product Support at the Caterpillar Plant.

In a very few cases, a Specific Swing stem could be needed for a specific machine.