COLLAR GP 4898273 - Caterpillar

Caterpillar: Confidential Yellow
OPTIONAL:SNUBBER WILL PROTECT FUEL PRESSURE SWITCH 824C, 776 TRACTORS; 825C, 826C COMPACTORS; 777 TRUCKS; 980C LOADERS - PI7 137 - MAILED US AND CANADA, CACO, COFA, 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.
SNUBBER WILL PROTECT FUEL PRESSURE SWITCH 824C, 776 TRACTORS; 825C, 826C COMPACTORS; 777 TRUCKS; 980C LOADERS, 1250, 1256, PI7137 (Revised June 1985) U-37 A-19 AU-29 C-28 E-26 O-26 optional Some new serial numbers for 980C Loaders have been added to the "Affected Machines". Replace Pages 1 and 2 of Service Letter (PI7137) dated March 28, 1985 with this revision. See the changes denoted by (right arrow). Problem The above models with the listed serial numbers use a fuel pressure switch to turn on the EMS warning horn system. On some machines, low frequency pressure pulses cause constant cycling of the switch diaphragm. This will rupture the diaphragm and cause a fuel leak. A pressure snubber is now installed between the fuel transfer pump and the switch. See Illustrations at end of this Service Letter. The snubber has a porous center which dampens the pressure pulses. Affected Machines And Parts Needed 824C Tractors 85X1033-85X1035, 1037-1040, 1042-1044, 1046-1113 825C Compactors 86X648-86X722 826C Compactors 87X362, 364, 365, 367, 370-372, 375, 377-487 776 Tractors 14H206-14H213 777 Trucks 84A1284-84A1512 980C Loaders 63X4991, 5003, 5004, 5017, 5020, 5023-5061, 5063-5819 (right arrow) 13B1-522, 524-526 * Parts Needed: 1-7S3795 Snubber 1-3T6962 Switch Assembly * Being mailed directly to owners in U.S. and Australia. Use a new switch in case the existing switch has a weakened diaphragm. Special Note on Parts Ordering (U.S. and Australia) Parts for the affected machines in dealer inventories in the U.S. and Australia will also be sent automatically to these dealers. Therefore, these dealers are not expected to order parts for any of the machines in this Program. All other dealers should order parts for this Program for any of the listed machines. Action Requested Install the new parts, or ask the owner to do this, on all the listed machines. The correct installation procedure is outlined in the Mail Notification found at the end of this letter. Provide the owner with a copy of the Procedure if he is to do the work. U.S. and Australia owners are to receive the Mail Notification. This asks them to install the parts as shown. A new switch should be installed even though the existing switch is not leaking because the diaphragm may have already been weakened. Warranty Allowances (SEE ILLUSTRATION) Parts Disposition Dispose of the parts in accordance with your