1982/09/13 Caterpillar

New Bearing Used In Air Starting Motor {1451}

Usage:

All Caterpillar Engines Equipped With An Air Starting Motor

Description of Change: A new bearing is used in the 4N4406 Nose Housing Assembly in the air starting motor groups on Caterpillar Engines. The new bearing is a "needle bearing" design and will have a longer service life.

Formerly, a bronze bushing was used.

Adaptable As: The new 6D3787 Bearing is currently used in the 4N4406 Nose Housing Assembly. Formerly, the 4N4407 Bushing was used in the 4N4406 Housing Assembly. The 4N4406 Housing Assembly is a direct replacement for the earlier housing with the former bushing. Because of a difference in the outside diameter the new bearing is not a direct replacement for the former bushing.

To use the new bearing in earlier housings, the existing bearing bore must be machined to a diameter of 25.400 ± .013 mm (1.0000 ± .0005").

Caterpillar Information System:

1982/09/13 Different Nuts And Washers, Increased Torque Prevent Loose Pistons, Broken Bolts In Suspension Cylinders {7201}

1982/09/06 New Shims Available To Make Drawbar Wear Strips Level{6153}

1982/09/06 New Instruction Card Available For 6V87 Valve Stem Gauge{0653}

1982/09/06 Reusability Of Camshaft Rollers And Roller Followers{1209,1210}

1982/09/06 Improved Inlet And Exhaust Valves{1105}

1982/09/06 New Water Pump Uses New Seal And Impeller{1361}

1982/09/06 Adapter And Seal Guide Make Assembly Of Water Pumps Easier{0622,1361}

1982/09/06 Repair Kits For Service Brakes Now Available{4260,4261,4262,4251}

1982/09/06 Vacuum Tester Checks For Leaks Between Valve Face and Seat{0651,1103,1105}

1982/08/30 Make Sure Generator Leads Do Not Move Against Frame{4459}

1982/08/30 New Radiator Core Assembly Has Full-Frame Reinforcement Plate For Longer Service Life{1353}

1982/08/30 Added Methods To Decrease The Effects Of High Sulfur Fuels{1355,1280,1318,1000}

1982/09/13 New Pinion Used In Transfer Gear Group For Power Shift Transmissions {3159}

1982/09/13 Two Oil Change Kits Have Oil Filters, Cooling System Conditioner {1318,1350}

1982/09/13 New Water Pumps Use New Seal And Impeller {1361}

1982/09/13 New Rocker Arm Assemblies Used {1102}

1982/09/13 Seat Belt Hook Fasteners {7327}

1982/09/13 Improved Idler Pulley Assemblies For 3208 Engines {1156,1358,4306}

1982/09/20 FT1421 Spring Installer Makes Installation of Seat Suspension Springs Easier{7324,0622}

1982/09/20 New Meter Can Be Used To Check Wire Feed Rates During Weld Operations Of Undercarriage Components{0653}

1982/09/20 New Recommendations For Track Roller Wear Before Rebuilding{4180,0662}

1982/09/20 Replacement Sprocket Rim Available{4156,4164}

1982/09/20 Filler Cap Locks Prevent Vandalism (Damage) To Fluid Compartments{1273,1316,1382,3177,5056}

1982/09/20 Dial Bore Gauge And Size Setting Fixture Available{0653}