1985/04/29 Caterpillar

Snubber Used To Protect Fuel Pressure Switch{1274}

Usage:

825C, 826C Compactors;
980C Loaders;
824C, 776 Tractors;
777 Trucks Equipped With An Electronic Monitoring System (EMS Panel)

Description of Change: A sintered bronze snubber is used in the fuel filter supply line on the above machines. The snubber (see illustration) is used to prevent low frequency pressure pulses from being transmitted from the fuel transfer pump to the fuel pressure switch. These pressure pulses can cause a failure of the diaphragm in the fuel pressure switch, and allow fuel to leak out of the switch body.

Adaptable To: The 7S3795 Snubber is used as shown in Chart A.

This change is adaptable to earlier machines as shown in Chart B.

NOTE: When a 7S3795 Snubber is installed in the fuel line, it is recommended that a new 3T6962 Fuel Pressure Switch be used.

Fuel filter supply line and 7S3795 Snubber.

Caterpillar Information System:

1985/04/29 Visual Inspection Can Detect Chrome Plated Engine Valves{1105}

1985/04/29 Special Pricing On Metric Hand Tools For U.S. And Canada Only{0600,0601,0602}

1985/04/29 Installing New Copper Bonded Bearings Can Extend Engine Life{1230,1203,1219}

1985/04/29 Scarifier Mounting Can Be Modified To Prevent Loosening{6150,6162}

1985/04/22 New Pins Used In Truck Body Group{7258}

1985/04/22 New Duo-Cone Seal Installer Is Available{0600,4051}

1985/04/22 Covers And Tandem Group Changed{4064,4062}

1985/04/22 FT1953 Gauge For Track Assembly{0600,0760}

1985/04/22 Correct Installation Of Oil Sequence Valves{1304}

1985/04/22 New Camshafts Used In SAE Standard [CCW] Rotation Engines{1200,1210}

1985/04/22 New Lamp Group Gives More Uniform Lighting{7300,7309}

1985/04/22 O-Ring Face Seal Fittings Available{5050,5057}

1985/04/29 New Lever Available For Exhaust Piping Group{1061}

1985/05/06 Installation Instructions For New Magnetic Switch{1408}

1985/05/06 New Battery Cable Crimping Die Available{0600}

1985/05/06 New Bearing Housings Available For Turbochargers{1052,1053,1056}

1985/05/06 Folded Core Radiators Used In Cooling Systems{1353,1350,1351}

1985/05/06 System To Find Internal Fuel Leakage{1250}

1985/05/06 New Bolt And Seal For Brake Make-Up Oil Tank{5056}

1985/05/06 Be Sure Correct Piston Rings Are Used On 3400 Series Engines{1215,1214}

1985/05/06 Remanufactured Fuel Ratio Controls Are Available In U.S. And Canada{1278,7754}

1985/05/13 New Piston Seal For 139.7 mm (5.50") Hydraulic Cylinders{5456,5457,5104,5458}

1985/05/13 Hydramechanical Governor Fuel Setting Information{1289,1250}

1985/05/13 Preventing Transmission Manual Switch Failures{3168}