AIR COMPRESSOR GP 1659175 - Caterpillar

Problem
The cushion hitch accumulator clamps may crack and fail on certain 621E, 623E, 627E, 631E/633E, 637E, and 657E Wheel Tractor Scrapers.
Affected Product
Model & Identification Number
621E (05A10193, 05A10194, 05A10224, 05A10225, 05A10254, 05A10330, 05A10337-10340, 05A10383, 05A10386, 05A10397, 05A10423-10425, 05A10439, 05A10450, 05A10503, 05A10504, 05A10534, 05A10650, 05A10651 6AB1589-1592 , 6AB1595, 6AB1596 8PL23-Up 4SK22-43 , 4SK46-70, 4SK72-85, 4SK88-93, 4SK96-101, 4SK104-106, 4SK108-142, 4SK146-166, 4SK168, 4SK170, 4SK172-187, 4SK189, 4SK191-216, 4SK218-241, 4SK244-249)
623E (6YF435-441 6BK23-174 )
627E (7CG931-941 1DL24-158 )
631E/633E (05A10307, 05A10308, 05A10438 1AB1490-1514 , 1AB1517-1547, 1AB1549, 1AB1550 1NB887-Up )
637E (1FB563-612)
657E (91Z459-466)
Parts Needed
621E, 623E, And 627E
2 - 8T4223 Washer-Plate2 - 8T8919 Bolt2 - 6V8188 Nut-Full2 - 1230562 Clip-Half631E/633E, 637E, And 657E
4 - 8T4223 Washer-Plate4 - 8T8919 Bolt4 - 6V8188 Nut-Full4 - 1230562 Clip-Half2 - Fabricated BlockAction Required
See the attached procedure.
Service Claim Allowances
This is a 2-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Procedure)Rework Procedure
621E, 623E, And 627E Wheel Tractor Scrapers
1. Refer to the Service Manual. Disconnect the 7I4601 Hose (Illustration 1 - Item 1) from the bottom of the cushion hitch accumulator (Illustration 1 - Item 2).2. Install a lifting eye to the top of the accumulator and secure with boom truck. Remove the 9U1478 Clamp (Illustration 1 - Item 3) and the hardware that secures the accumulator to the 8W9146 Bracket (Illustration 1 - Item 4) remove the accumulator from the machine and set aside.3. Drill 2 13.8 holes in the 8W9146 Support Assembly (Illustration 2 - Item 1) using the dimensions in Illustration 2.4. Reinstall the accumulator (Illustration 3 - Item 1) to the 8W9146 Support Assembly using the hardware (Illustration 3 - Item 2) previously removed.5. Install 2 1230562 (Illustration 3 - Item 3) to the accumulator and secure to the 8W9146 (Illustration 3 - Item 4) Support Assembly with 2 8T8919 Bolts (Illustration 3 - Item 5), 2 8T4223 Washers (Illustration 3 - Item 6), and 2 6V8188 Nuts (Illustration 3 - Item 7). Install the washers to the clamp.
6. Connect the 7I4601 (Illustration 3 - Item 8) to the bottom of the accumulator.7. Check fluid levels and adjust as required.
Illustration 1
Illustration 2
Illustration 3631E/633E And 637E Wheel Tractor Scrapers
1. Remove 2 9U1478 Clamps (Illustration 4 - Item 1) and hardware. The clamps and hardware will not be used again.2. Remove 2 8W3498 Blocks (Illustration 5 - Item 1) from the 8W6068 Support Assembly (Illustration 5 - Item 2). Grind the 8W6068 Support Assembly smooth where the blocks were removed.3. Make 2 Blocks as shown in Illustration 6.4. Attach 4 123-0562 Clamps to accumulator (Illustration 7 - Item 1) with 4 8T8919 Bolts (Illustration 7 - Item 2), 4 8T4223 Washers (Illustration 7 - Item 3), and 2 fabricated blocks (Illustration 7 - Item 4). Locate the blocks to the 8W6068 Support Assembly (Illustration 7 - Item 5) as shown. Tack the blocks to the support assembly as shown. Remove clamps and hardware from accumulator, then finish welding the blocks to the support.5. Reinstall the clamps and hardware to the accumulator and tighten as required.
Illustration 4
Illustration 5
Illustration 6
Illustration