1994/08/08 Caterpillar

Improved Air Starter Motor Housing and Silencer (Lighter Weight){1451}

Usage:

776C (2TK),
784B (5RK) Tractors;
777C (4XJ),
785B (6HK),
789 (7EK),
793B (1HL) Trucks;
994 (9YF) Wheel Loaders

Description of Change: The air starter motor housing and silencer have new light-weight aluminum replacements. These aluminum parts reduce the overall weight of the starting motor group. This weight reduction results in less strain on the four air starter mounting bolts. The silencer, previously made of two parts, has a new one-piece design. All the new aluminum parts have the same reliability and life as the older, heavier parts.

Adaptable To: The new 107-8769 Silencer replaces the former two-piece 8N-8488 Silencer and 8N-8447 Elbow (part of 4W-6634 Air Motor Starting Group). See the illustration. The 111-4399 Housing has also been redesigned and replaces 5N-8364 Housing (part of new 7C-3372 Air Starting Motor or former 4W-6633 Air Starting Motor). The changes are adaptable to earlier production models.

New 107-8769 Silencer.

If the air starter motor is not scheduled for overhaul, the silencer should be replaced as soon as possible. This will help reduce the overall weight of the group until the housing is replaced.

NOTE: When changing to the new aluminum parts, the four 5N-8427 Bolts (mounting) should be replaced.

Caterpillar Information System:

1994/08/08 Additional Clamp Used In Fuel Injections Lines Groups{1252}

1994/08/08 SOS Allowable Soot Level Changed{1318}

1994/08/08 Procedure To Disable Top Gears On Small Wheel Loaders And Integrated Toolcarriers{3168}

1994/08/08 Heavy Duty Alternator Available For Landfill Compactor{1400}

1994/08/08 New Covers Protect Inverted Rear Suspension Cylinders{7164}

1994/08/08 Body Mounting Plate Can Contact Front Service Brake Roto Chamber{4262,4266,7258}

1994/08/08 External Fuel Tank Wear And Corrosion Can Be Prevented{1273}

1994/08/08 New Front Engine Support Available For Parts Service{1153}

1994/07/25 New Locking Plate And Thrust Flange Used In Hitch Drive Shaft Group{7051}

1994/07/25 A New SEPD0208 Special Edition Service Magazine Available For "D" Series Articulated Trucks{0374}

1994/07/25 Spacers Used To Eliminate Noise Due To Lateral Hoist Cylinder Movement When The Body Is Raised{5102}

1994/07/25 Maintenance Interval For Steering Components, Hoist Cylinder Bearings And Rear Axle Housing "A" Frame Bearings Has Changed{7521,7551}

1994/08/15 New Piston With Lower Top Ring Position{1225}

1994/08/15 New Parking And Secondary Brake Switch Is Now Available{4282}

1994/08/15 Rear Suspension Group Is Inverted For Improved Seal Life{7213}

1994/08/15 Higher Output Alternator And New Heavier Mounting Group Improves Service Life{1405,1406,1400}

1994/08/15 Use Procedure To Adjust Screed Flatness And Extender Angle Of Attack{6643}

1994/08/15 Tooling Plate Simplifies Swashplate Neutral Adjustment on Drum Propel Pump{5070,0738}

1994/08/15 Power Proportioner Valve No Longer Available{5086}

1994/08/15 Switches With Screw Terminal And Sure Seal® Connector Replaced By Switches With A DT Connector{1400,7400}

1994/08/22 Parking Brake Performance Can Be Increased{4267,4251}

1994/08/22 Procedure To Modify 4P-4866 Coupling And 4P-4864 Housing To Work With New High Pressure Turbocharger{1052}

1994/08/22 New Hoist Control Valve Used To Improve Hoist Cylinder Operation{5136}

1994/08/22 Drive Shaft Bearings Inside The Hitch Need To Be Greased During Assembly {3253,7100}