0513851 JOHNSON TERMINAL, Socket

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PSP FOR FUEL TRANSFER PUMP VALVES; 3406B TRUCK, MARINE, INDUSTRIAL, MARINE, GENERATOR SET ENGINES; 16G MOTOR GRADERS; 245 EXCAVATORS AND FRONT SHOVELS; 824C TRACTORS, 825C 826C COMPACTORS; 980C LOADERS - MAILED US AND CANADA, CFEL, COSA A, CFEL, COSA
  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.
PRODUCT SUPPORT PROGRAM FOR FUEL TRANSFER PUMP VALVES; 3406B TRUCK, MARINE, INDUSTRIAL, GENERATOR SET ENGINES; 16G MOTOR GRADERS; 245 EXCAVATORS AND FRONT SHOVELS; 824C TRACTORS, 825C, 826C COMPACTORS; 980C LOADERS, 1256, PS4021 U-27 C-26 E-21 O-22 This Service Letter replaces the October 4, 1985 Service Letter. Cross out the October 4, 1985, Service Letter and refer to this Service Letter. 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 "PS4021" as Part Number and "7755" as Group Number. Although products in the field are to be administered as described above, dealers should purge parts stock immediately. A Service Letter similar to this one has been sent to all TEPS Dealers. Termination Date
April 30, 1987
Problem
The fuel transfer pump on the above engines has three-1W6182, 7W402 or 7W8412 Valve Assemblies. The valve in the piston can fail, and some damage can also occur to the other valve assemblies. The problem with the 1W6182 and 7W402 Valve Assemblies has been reported mainly in cold weather applications. The problem with the 7W8412 Valve Assembly is related to hot fuel. New improved valves are now used in the piston and at the other two locations in the pump. These valves are directly adaptable to earlier engines.
Affected Product
Products fixed with earlier 7W8412 Valves (black discs) are eligible for this Program with new parts. Some of the following vehicles contain the 3406 Engine with the former scroll fuel system and are not in the Program. Model Identification Number 3406B Truck Engine 7FB1-56107 3406B Marine Engine 4TB1-800 3406B Industrial Engine 6TB1-3011 3406B Generator Set 2WB1-3251 16G Motor Grader 93U2284-2598 245 Excavator 95V1084-1228 94L525-773 245 Front Shovel 82X618-646 84X686-908 621B Tractor 2GB124 45P3521, 3523-3920 623B Tractor 46P1957, 1971-2299 627B Tractor 14S1188, 1191, 1212, 1220, 1237, 1252, 1253, 1267, 1277, 1290 15S1726 824C Tractor 85X958-1202 825C Compactor 86X634-734 826C Compactor 87X338-598 980C Loader 63X4923, 4929, 4933-6722 2EB367-379 13B373-619
Parts Needed
1 - 7C396 Spacer 1 - 6F6672 Seal 1 - 3D2824 Seal 1 - 6J2419 Seal 1 - 3D2898 Seal 1 - 5P8215 Seal 1 - 4J8997 Seal 3 - 7W8412 Valve As. (blue or white)
Action Required
Parts Action Remove all 1W6182 or 7W402 Valve Assemblies from parts stocks. Also remove all 7W8412 Valve Assemblies with black discs from parts stocks. (All packages with date codes before 3/86.) See the illustration. The new 7W8412 Valve Assembly has either blue or white disc material. Be sure to use the 7C396 spacer (Blue) with the new valve. The new valve is thinner and requires the new, thicker spacer. Do not use any former 4W6908 Seals or 7W801 Spacers in 3406B Engine applications. Rework 1W1700 Transfer Pump Groups in your parts stock and stamp an "0" on the pump mounting flange. Dealers should rebuild a few transfer pumps to be used as exchange pumps. (SEE ILLUSTRATION) Affected Product Before work is started, see if an "O" or an "O" around an "X" is stamped on the outer rear face of the transfer pump mounting flange near the short mounting bolt. This identification means that the pump has been reworked at the factory or by another dealer. If the affected product does not have a reworked transfer pump, install a transfer pump that has all the new parts on the affected product. Make sure an "O" is stamped on pump mounting flange. Some failure modes are aggravated by high fuel temperature. It is suggested that fuel heater usage be investigated and customers reminded