1982/02/22 Caterpillar

New Piston And More Springs Used In Transmission{3155,3170}

Usage:

768C And 772B Tractors;
769C And 773B Trucks

Description of Change: A new piston and eight more springs are used in the No. 2 Clutch in the planetary transmission group on the above machines. The added springs are used to make sure the piston is completely retracted when the No. 2 Clutch is not engaged. This is especially important during high idle, neutral operation such as when the load is dumped. The use of more springs made it necessary to release a new piston.

Formerly, it was possible for the piston to not completely retract. This caused extra wear on the clutch components.

Adaptable As: The new 3T7417 Piston and eight more 8P5058 Springs are direct replacements for the former 3P8156 Piston, which has been canceled. The quantity of 8P5058 Springs changed from 12 to the new quantity of 20.

Location of piston and springs in the planetary group.

Caterpillar Information System:

1982/02/22 Torque/Pressure Conversion Table For 6V200 Hydraulic Wrench{0614,0623}

1982/02/22 Difference Between Static And Dynamic Rack Settings Changed{0374,1257}

1982/02/22 New Water Pump And Rebuild Kit Available{1361}

1982/02/15 Stronger Orifices Used In Control Valve{3167}

1982/02/15 Stronger Spanner Wrenches Now Available{0612,0613}

1982/02/15 New Design Drain Tube For Transmission Solenoid Valve{3163,3167}

1982/02/15 Tools For Replacement Of 1M6762 Puller Ring To Remove Final Drive Outer Bearing Support{0621,4066}

1982/02/15 New Fuel Nozzle Adapter Assembly Used{1106}

1982/02/15 Improvements To Differential, Differential Carrier, And Differential Lock{3258,3264,3280}

1982/02/15 New 6V4810 Tool Group Used To Service Vehicles Equipped With VE (Vehicular Environmental) Series Electrical Connectors In Electrical Harness{0610,0620}

1982/02/08 Use Microfiche Libraries For Up-To-Date Information{0374}

1982/02/08 New 6V4818 Driver Available To Install Rack Bearings In Fuel Injection Pump Housings{0622}

1982/02/22 Improved Bearing Used In Rear Power Takeoff Groups{3055}

1982/02/22 Use A Magnetic Chuck To Hold Parts On Work Bench{0626}

1982/02/22 Engine Storage; Engine Start-Up After Storage{1000}

1982/02/22 Screen Added To Oil Lines At Inlet Of Brake And Torque Converter Oil Cooler{1366,1365,1375,1376,3103,3154,3179,4257,4304,5057,5068}

1982/02/22 Use 6V6035 Hardness Tester On Crankshafts{0651,1202}

1982/02/22 New Idler Shaft Used In Fuel Transfer Pumps{1256}

1982/03/01 Shorter Bolts Used In Four Locations To Fasten Piston Motor Head To Body{3201,4351,5058}

1982/03/01 New Gasket Used In Governor And Fuel Injection Pump Group{1259,1286}

1982/03/01 New 6V4180 Off-Engine Lifter Setting Tool Group{0654}

1982/03/08 Resurfaced Cylinder Blocks And Heads{1201,1101,1000}

1982/03/08 Reconditioning of Bridge Wear Seat Is Permitted; Will Prevent Bridge Replacement When Not Necessary{1100}

1982/03/08 New Adapters And O-Ring Seals Used In Aftercooler Group{1063}