CYLINDER HEAD GP 4155585 - Caterpillar

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.
This Program must be administered as soon as possible. When reporting the repair, use "PI3837" 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 "PI3837" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Completion Date
July 31, 1996Termination Date
January 31, 1997Problem
The swing frame on certain 5230 Excavators may experience cracking between the front casting and bottom plate, below the boom cylinder mounts. This can be prevented by welding reinforcing plates to the swing frame.
Affected Product
Model & Identification Number
5230 (7LL28, 7LL30-40)
Parts Needed
Dealers will need to order parts for this Program.
4 - 4K8864 Clip4 - 8T4121 Washer-Hard4 - 8T4137 Bolt2 - 1316515 Plate2 - 1316516 Plate2 - 1318132 Hose Assembly1 - 1318713 Plate Assembly1 - 1318714 Plate AssemblyAction Required
See the attached procedure.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
This is a 36-hour job.
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
Rework Procedure
1. Lower the boom to the ground and relieve the pressure in the pilot system and hydraulic system. Remove (2) 8X3493 Hose Assembly (grease lines) from the boom cylinder rod eyes (see attached sheet 3 of 5).2. Unpin the boom cylinder rod ends from the swing frame to gain access to the swing frame for welding. Install the rod end PIN into the swing frame bores to provide an additional heat sink to minimize bore distortion.3. Inspect the area between the swing frame casting and bottom plate under the boom cylinder mounts for cracks. If cracks are present, they must be repaired by gouging the cracks, welding per the note and grinding smooth.4. Prepare the surface of the swing frame casting to be welded.5. Locate and tack (2) 1316515 Plates flush with the inside face of the support casting "eye". Place one pass of weld at the location marked " WELD 1" (typical right and left side). Important: Let each pass of weld cool 5 to 7 minutes or until the temperature returns to ambient.Cooling rate can be increased by blowing compressed air over the weld.Each pass of weld needs to cool to prevent the bores/bearings in the swing frame from distorting from heat (this method has been successful at the factory). Do not use water to cool the welds since it will quench the weld causing material hardness problems.Continue alternating a pass of weld on each side of