1994/09/26 Caterpillar

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

Usage:

D11N (4HK, 74Z) Tractors;
793 (3SJ),
793B (1HL) Trucks;
5130 (7TJ, 5ZL),
5230 (7LL) Excavators

Description of Change: New gears have been added to the rear auxiliary drive group. The new gears help to reduce the noise generated from the gear train. If the engine is exceeding noise level standards, new gears can be installed to reduce the overall noise generated by the engine.

New pipe plugs have also been added to the auxiliary drive group. The new plugs are coated with a special material. This coating makes installation easier and helps retain the plugs in the housing assembly.

Location of new auxiliary drive group (Rear) components. 7X-7731 Pipe Plug (1). 8T-6757 Pipe Plug (2). 107-8748 Auxiliary Drive Gear (3). 107-8749 Auxiliary Drive Gear (4).

Adaptable To: The new components in the 2W-8364, 7E-6620, and 9Y-8899 Auxiliary Drive Groups are identified in the illustration and chart. The new components are direct replacements for the former components. The former auxiliary drive gears are canceled.

Caterpillar Information System:

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}

1994/09/26 Caterpillar Legendary Service Literature Catalog SELD0811 Updated{0374}

1994/09/26 New Gasket Provides Improved Sealing Between Air Compressor And Drive{1803}

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}