1990/09/17 Caterpillar

New Bevel Gear Group In Differential And Bevel Gear Group Has Different Gear Tooth Design To Increase Service Life {3280,3254,3256}

Usage:

789 Trucks

Description of Change: A new differential and bevel gear group is used that contains a new bevel gear group. A new tooth design provides tip relief for the pinion and bevel gear which increases the service life of the differential and bevel gear group.

Adaptable To: The new 8X7240 Differential & Bevel Gear Group is a direct replacement for the former 8W9550 Differential & Bevel Gear Group. The former differential & bevel gear group has been canceled. The new differential and bevel gear group is effective with 789 Truck 9ZC489. The complete differential and bevel gear group does NOT need to be replaced on earlier trucks. The new 8X7231 Bevel Gear Group is a direct replacement for the former 8W9485 Bevel Gear Group. The former bevel gear group has been canceled. The two new groups are adaptable to earlier trucks.

Caterpillar Information System:

1990/09/17 New Hoist Diverter Valve Group Eliminates Spring Breakage {5066}

1990/09/17 Rod And Piston On Rear Suspension Cylinders Are Now One Piece {7201}

1990/09/17 Special Instruction Available To Improve Stop/Tail Lamps For Off-Highway Trucks, Tractors And Wheel Tractor-Scrapers {1432}

1990/09/17 Special Instruction SEHS9177, Has Adjustment Procedure For Door Latch Assemblies And Strikers {7308}

1990/09/17 New Lever Assembly Eliminates Interference Between Grapple Control Handle And Windshield {5059,7340}

1990/09/17 New Differential Steering Pump And Pump Lines {4312,4102}

1990/09/10 Improved 9X5303 Control Group Has Higher Manual Injection Temperature For Automatic Ether Injection System (AEIS) To Give Smoother Operation{1456}

1990/09/10 Bolt Tightening Procedure For Oil Scavenge Pump; Corrections To Service Manual Modules{1312}

1990/09/10 New Seal Used In Lube Boost Motor{3154}

1990/09/10 Backhoe Valves Do Not Use Shims; Incorrect Statement In 446 Backhoe Loader Hydraulic System Specifications, Form SENR3975{5476}

1990/09/10 New Seals And Piston Nuts Used; New Head Bolt And Piston Nut Tightening Torques Used In Excavator Cylinders{5456,5457,5458,5470}

1990/09/10 All Wheel Drive Torque Control Setting Procedure{5700,4352}

1990/09/17 Improved Exhaust Shield Groups Provide Easier Assembly And Serviceability {1067,1073}

1990/09/24 Procedure To Eliminate Implement Hydraulic Hesitation{5129}

1990/09/24 New Support Plate Assembly And Spacers Used{6607}

1990/09/24 New Components Improve Propel And Throttle Adjustments{1265,3209}

1990/09/24 Field Installation Kit Available To Install Magnetic Clutch-Type Water Spray Pump, Cutter Drum Interlock, And Kick-Back Shoe{1408,5614,6601,7493}

1990/09/24 New 6R2915 Seal Kit Available For 8C3866 Upper Conveyor Drive Motor{4351}

1990/09/24 Seal And Seal Holder In Transfer Gear Groups Now Serviced As One Piece{3159}

1990/09/24 New Fixed Length Door Stop Used{7308}

1990/09/24 Improved Access To Hydraulic Oil Level Indicator Harness{7490}

1990/09/24 Two New Coolant Flow Switches Used On Machines Equipped With Electronic Monitoring System (EMS){1361,7422,7470}

1990/09/24 Sealing Threads On Switches And Sensors That Are Grounded Through The Case{1400,1900,3175,7422,7493}

1990/09/24 Standard Oval And High Temperature Oval Head Seals Available For Certain Hydraulic Cylinder Applications{7555,5102,5456}