The Stabilizer Legs On Certain 428B And 438B Backhoe Loaders Need To Be Reinforced Caterpillar

The Stabilizer Legs On Certain 428B And 438B Backhoe Loaders Need To Be Reinforced

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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 must be administered as soon as possible. When reporting the repair, use "PI3639" as the Part Number, "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 "PI3639" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and " Z" as the SIMS Description Code.

NOTE: This Revised Service Letter replaces the May 28, 1993 Service Letter. A change was to correct the Termination Date.

Completion Date

November 30, 1993

Termination Date

May 31, 1994

Problem

The stabilizer legs on certain 428B and 438B Backhoe Loaders need to be reinforced.

Affected Product
Model & Identification Number

428B (7EJ689-699, 7EJ701-720, 7EJ722-728, 7EJ730-756, 7EJ758, 7EJ760, 7EJ763, 7EJ764, 7EJ775-781, 7EJ783, 7EJ786-797, 7EJ799-801, 7EJ803-810, 7EJ815, 7EJ819, 7EJ824-827, 7EJ829-835, 7EJ837, 7EJ841-843, 7EJ845, 7EJ848-849, 7EJ852-857, 7EJ859-860, 7EJ864, 7EJ867-870, 7EJ873, 7EJ880-881, 7EJ885, 7EJ894)

438B (3KK526, 3KK528-534, 3KK536, 3KK542, 3KK544, 3KK546, 3KK561-566)

Parts Needed

Dealers will need to fabricate 2 steel plates as described in the attached rework procedure.

Action Required

See the attached rework procedure.

Owner Notification

Example of Owner Notification attached.

Service Claim Allowances

Inspection Only

NOTE: This is a .5-hour job.

Inspection And Rework

NOTE: This is a 5-hour job. (1 hour to fabricate the plates and 4 hours to weld them to the stabilizer leg.)

Parts Disposition

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

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

Attach.

(1-Owner Notification Example)

(2-Rework Procedure)

Example Copy Of Owner Notification

Rework Procedure

1. Measure thickness of plate "A". See Illustration 1. If plate "A" measures 10 mm thick, no further work is required. If plate "A" measures 8 mm thick proceed to Step 2.

Illustration 1

2. Fabricate 2 plates 300 mm x 135 mm x 6 mm of ASTM A108 Grade 1018 steel as shown in Illustration 2.

Illustration 2

3. Disconnect battery cables.

NOTE: Do not lower the inner stabilizer legs, because this will place the non- metallic wear pads in the heat affected zone during the welding process.

4. If the machine has been in service, check plate "A" for flatness. If plate "A" is deformed, heat the affected area and straighten.

5. Remove all paint and dirt from the area to be welded, and weld the reinforcing plates "B" to plates "A" as shown in Illustration 3.

Illustration 3