1994/09/26 Caterpillar

New Gasket Provides Improved Sealing Between Air Compressor And Drive{1803}

Usage:

16G (93U) Motor Graders;
621E (6AB),
621F (4SK, 8PL),
623F (6BK),
627F (1DL),
631E (1AB, 1NB),
637E (1FB),
651E (89Z) Scrapers;
768C (02X),
772B (64W) Off Highway Tractors;
769C (01X),
773B (63W) Off Highway Trucks;
771C (3BJ),
775B (7XJ) Quarry Trucks;
824C (85X) Wheel Tractors;
825C (86X),
826C (87X) Compactors;
980F (5XJ, 8CJ, 3HK) Wheel Loaders;
D40D (2JJ),
D400D (8TF) Articulated Trucks;
RR-250 (6ED) Road Reclaimer;
SS-250 (6DD) Soil Stabilizers;
RM-350 (5FK) Reclaimer/Mixers;
SM-350 (1RM) Soil Stabilizers

Description of Change: A new gasket is used in the air compressor groups on the above machines. The new gasket material has less rubber content. This helps prevent the new gasket from hardening and becoming brittle. The new gasket will provide better sealing and increased service life.

Location of new 100-6178 Gasket in typical air compressor group.

Adaptable To: The 100-6178 Gasket is a direct replacement for the former 7W-6084 Gasket in the air compressor groups on the above machines.

NOTE: When installing a new 100-6178 Gasket:

* The "beaded" side of the new gasket must be toward the front timing housing.

* The new gasket must NOT be coated with anti stick compound.

Caterpillar Information System:

1994/09/26 New Gears Reduce Noise And Pipe Plugs Make Installation Easier In Auxiliary Drive Group{1150,1165}

1994/09/26 Exhaust Dust Ejector Operation{1055,1068}

1994/09/26 Arc Suppressors Improve Life of Air Conditioner Thermostatic Switch{7337}

1994/09/26 Engine Maintenance Check Deleted{1100}

1994/09/26 New Hitch Seal And Retaining Ring Used In Rear Frame Groups Reduces Hitch Face Wear{7051}

1994/09/26 Maintenance Guidelines For Exhaust Bypass Group{1057}

1994/09/26 Bolts Are Now Used In The Steering Linkage Group/Torque Specification Has Been Raised{4305}

1994/09/26 Muffler Group and Exhaust Piping Groups Changed To Provide A New Slip-Fit Muffler{1062,1061}

1994/09/26 New Gears Are Available To Reduce Transfer Gear Noise Levels{3159}

1994/09/26 New Spring Retainer Used In Main Hydraulic Control Valves{5051}

1994/09/26 Tensioner Group Pin May Be Difficult To Remove{4197}

1994/09/26 Improved Lamp Body Now Available{1429}

1994/10/03 New Flexible Lines Used In Aftercooler Water Lines Group{1380,1063}

1994/10/03 New Flexible Exhaust Assembly Has Longer Service Life{1061}

1994/10/03 Drive Shaft Lubrication Requirements{3253}

1994/10/03 Special Instruction SEHS9803 Is Available For Reinforcing The 7U-1598 (Center) And 7U-1599 (Rear) Frame assemblies To Prevent Cracking{7200}

1994/10/03 New Mounting Hardware for Leveling Blade Arms Improves Retention{6051,6061}

1994/10/03 Fan V-Belt Part Number Has Changed For Certain Models With The 3204 Engine{1357}

1994/10/03 Oversize Fuel Pump Drive Idler Shaft Available To Salvage Cylinder Block{1206}

1994/10/03 New Engine Crankshaft Rubber Damper Assembly Uses Improved Rubber Material{1205}

1994/10/10 New Exhaust Flex Hose Used To Avoid Leaks From System Vibration{1058}

1994/10/10 New Oil Cooler And Hose Improves Routing{1374}

1994/10/10 New Transmission Oil Filter With Improved Seal Area{3164}

1994/10/10 Larger Stick Cylinder Piston Bolts Prevents Loosening{5458}