KIT-CUSHION 5210744 - 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 can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4277" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
March 31, 1999Problem
Pressure spikes under certain operating conditions may damage the 8T0855 Gauge used in the counterbalance system on certain AP-1050B and AP-1055B Asphalt Pavers; and on certain Barber-Greene BG-245C and BG-2455C Asphalt Pavers manufactured by Caterpillar. A gauge isolator may be added to protect the gauge from these spikes.
Affected Product
Model & Identification Number
AP-1055B (8BM1-265)
AP-1050B (6ZN1-185)
BG-245C (4XN1-115)
BG-2455C (6TN1-134)
Parts Needed
2 - 8C6868 Connector2 - 3J1907 Seal-O-Ring2 - 3J7354 Seal-O-Ring1 - 5P8998 Nipple1 - 8T0855 Gage-Pressure1 - 6V0852 Cap Dust1 - 6V4144 Coupler As1 - 6V3989 Nipple4 - 6V8397 Seal-O-Ring1 - 6V8781 Tee-Face1 - 6V9200 Elbow-Face2 - 6V9850 Elbow-Swivel1 - 1541425 Isolator-Gauge1 - 1542699 Plate1 - 1542811 Hose As1 - 1542858 Hose AsAction 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
Illustration 11. Disconnect the existing 111-4660 hose from the return port of the counterbalance valve.2. Remove 6V8993 connector from the counterbalance valve that 111-4660 hose was connected.3. Install items 2, 8, 9, and 11 in return port of the counterbalance valve.4. Connect hose that was removed in step 1 to fitting closest to valve in the return port.5. Install one end of item 12 on other fitting.6. Remove the pressure gauge and all fittings from the gauge port of the counterbalance valve.7. Install items 3, 8, and 10 in gauge port of the counterbalance valve.8. Weld item 14 to the angle that the counterbalance valve is mounted to, using the following dimensions. Prior to welding, turn off (open) the electrical disconnect switch.
Illustration 2 9. Install items 1, and 8 in isolator valve (item 13) Illustration 110. Install items 4, 5, 6, and 7 in isolator valve (item 13 as shown in Illustration 1.11. Install items 1, 8, and 11 in isolator valve (item 13) as shown in Illustration 1.12. Install assembled isolator valve (item 13) in item 14 that was welded on machine in step 8.13. Connect the other end of hose that was installed in step 5 to bottom fitting of isolator valve. (Illustration 1)14. Install item 15 between the gauge port of counterbalance valve and the side port of the isolator valve.15. Reset the counterbalance pressure between 1 - 150 psi. A pressure setting above 150 psi may cause mat