PRODUCT IMPROVEMENT PROGRAM FOR REPLACING LEAKING VALVE STEMS ON CERTAIN TH48 FRAC TRANSMISSIONS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR REPLACING LEAKING VALVE STEMS ON CERTAIN TH48 FRAC TRANSMISSIONS

Usage:

REBE2039-00

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15Aug2007

U-403

D-331

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*Priority*	PRODUCT IMPROVEMENT PROGRAM FOR REPLACING LEAKING VALVE STEMS ON CERTAIN TH48 FRAC TRANSMISSIONS
3001 3101 3206		PI31328

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NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI31328" 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 "PI31328" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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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
29Feb2008	31Aug2008

PROBLEM

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The converter inlet relief valve stem and speed increaser lube relief valve stem need to be replaced on certain TH48 FRAC Transmissions. The existing stem can result in high converter inlet pressure and also cause external oil leaks.

AFFECTED PRODUCT

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Model	Identification Number
TH48 OEM	FRT00004-00008, 44-232, 234

PARTS NEEDED

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Qty	Part Number	Description
2	9H6761	SEAL-O RING

ACTION REQUIRED

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See the attached Rework Procedure.

NOTE: Obtain two new relief stems from Brian Huffman (713)329-2214 or Sam Ternes (713)895-4510. This part is not serviced through the parts system.

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OWNER NOTIFICATION

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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%	100%	0%	0%	0%	0%

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NOTE: This is a 3.0-hour job

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PARTS DISPOSITION

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

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

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

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REPLACING LEAKING VALVE STEMS ON CERTAIN TH48 FRAC TRANSMISSIONS

MODELS INVOLVED - TH48 FRAC TRANSMISSIONS

Dear Caterpillar Product Owner:

The relief valve stem needs to be inspected and potentially replaced on the products listed below. The existing relief valve can leak. 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 15Aug2007 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 15Aug2007 Service Letter

Rework Procedure

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Obtain two new relief stems from Brian Huffman (713)329-2214 or Sam Ternes (713)895-4510. This part is not serviced through the parts system at the piece part level and will be provided upon request by product support.

Determination of Affected Units
To determine if updating is required, identify the Speed increaser relief valve 261-3350 shown as item 3 in Figure 1. This valve also can be identified by the part number stamped on one of the 6 flats.

Figure 1 ? 261-3051 Manifold group identifying 3 valves

Image1.1.1

Using Figure 2 as a guide, measure the dimension from the face of the jam nut (blue) to the tip of the set screw (red) on this valve. If it measures 28mm (1.10"), no rework is required. If it measures 44mm (1.73"), proceed with the rework instructions as outlined below.

Figure 2 ? 261-3350 Measurement of set depth

Image1.2.1

Instructions for 261-3350 Valve As. (Speed increaser lube valve)
Remove the setscrew from the valve body by first loosening the jam nut. Remove the jam nut from the setscrew and thread it onto one of the two replacement set screws provided. Ensure the replacement set screw is fitted with a 9H-6761 O-ring seal. Replace the set screw and jam nut in the valve body. After warming the unit to operating temperature, run the unit in Neutral at high idle with a pressure transducer installed on the port labeled "SI LUBE" on the manifold and adjust the setscrew in or out as required to obtain a set pressure of 40 psi. A more detailed description of the pressure setting procedure is available in RENR9663 Testing and Adjusting under the heading "Relief Pressures for Control Manifold ? Testing and Adjusting."

Instructions for 261-3350 Valve As. (Torque converter inlet relief valve) This procedure should be performed on all affected units regardless if the lube relief valve rework was required.
Remove the setscrew from the valve body by first loosening the jam nut. Remove the jam nut from the setscrew and thread it onto one of the two replacement set screws provided. Ensure the replacement set screw is fitted with a 9H-6761 O-ring seal. Replace the set screw and jam nut in the valve body. Turn the setscrew clockwise into the valve body until the threads bottom out. Tighten the jam nut to lock the setscrew in place.