1990/09/17 Caterpillar


Rod And Piston On Rear Suspension Cylinders Are Now One Piece {7201}

Usage:


776, 776B Tractors;
777, 777B, 785, 789 Trucks

SUPPLEMENT: 11/18/91

Service Magazine; September 17, 1990; Page 4; "Rod And Piston On Rear Suspension Cylinders Are Now One Piece" on 776, 776B Tractors; 777, 777B, 785, 789 Trucks. In the fourth paragraph, the new rod assembly should be 6E1262 and not 6E1282 as a direct replacement for the former 1U4044 Piston and 9T5275 Rod Assembly in the 1U4651 Rear Suspension Group on the 785 Truck.

--------------- END SUPPLEMENT ---------------

Description of Change: New rod assemblies replace the former rod assemblies and pistons on 785 and 789 Trucks. The one-piece rod has been in use on 776, 776B Tractors; and 777, 777B Trucks for some time.

Adaptable To: The improved 9J7776 (776, 776B, 777, 777B), 1U4651 (785), and 4T4844 (789) Rear Suspension Groups (same part numbers) are direct replacements for the former groups. The illustration shows the new parts.

The new 6E1282 Rod Assembly is a direct replacement for the former 4T4763 Piston and 4T4766 Rod Assembly in the 4T4844 Rear Suspension Group on the 789 Truck.

The new 6E1282 Rod Assembly is a direct replacement for the former 1U4044 Piston and 9T5275 Rod Assembly in the 1U4651 Rear Suspension Group on the 785 Truck.

The new 9T5507 Rod Assembly is a direct replacement for the former 9T3972 Rod Assembly and 8J8899 Piston in the 9J7776 Rear Suspension Group on 776, 776B Tractors; and 777, 777B Trucks.

NOTE: A 9T5505 Plate is required to contain the check ball in the new one-piece rod assemblies in all three groups. See illustration.


New components in improved rear suspension group.

Caterpillar Information System:

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}
1990/09/10 Drawbar Support Group And Support Assembly May Require Wear Plates{7119}
1990/09/10 Shims Are Available For Aligning Idlers To Eliminate Excessive Scrubbing{3282}
1990/09/17 New Hoist Diverter Valve Group Eliminates Spring Breakage {5066}
1990/09/17 New Bevel Gear Group In Differential And Bevel Gear Group Has Different Gear Tooth Design To Increase Service Life {3280,3254,3256}
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}
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