1979/09/03 Caterpillar

Improved Wire Assembly For Glow Plugs{1403}

Usage:

776 ( 14H ) Tractors and 777 ( 84A ) Trucks

Description of Change: An improved wire assembly in the lighting and wiring groups is now used on 776 Tractors and 777 Trucks. The improved wire assembly, which connects to the glow plugs, has cross-link polyethylene insulation. Clips are also used to hold the wire away from the fuel injection lines for a longer service life. Formerly, it was possible for the insulation on the wire to wear against a fuel line and cause an electrical short. This can burn a hole through a fuel line.

Adaptable To: The improved 9D6972 Wire Assembly can be installed on all earlier 776 Tractors and 777 Trucks. Two 4D7794 Clips are needed to hold the wire in the correct position. The part number of the 9D6972 Wire Assembly did not change.

Caterpillar Information System:

1979/09/03 Quick Disconnect Coupling On Optional Modification Of 5P4150 Nozzle Tester Permits Faster Exchange Of Adapters{0651,1254}

1979/09/03 Important: Use Only 8N4029 Fan On 769C Trucks And 768C Tractors{1356}

1979/09/03 Follow Recommendations Given In Special Instructions For Modification Of Rollover Protective Structures (ROPS) At All Times{7323,7325}

1979/09/03 Only One Dowel Pin Is Now Used To Hold The Thrust Bearing In The Correct Position{1053,1052}

1979/09/03 Use Caution To Prevent Damage To Plastic Check Valve In Hydraulic Oil Tank And Transmission Oil Tank Drain{5056,3177}

1979/08/27 New Design Thrust Plate Used In Crankshaft Group{1201,1202,1203}

1979/08/27 New Rocker Arms And Rocker Arm Shaft Have Improved Lubrication{1102}

1979/08/27 Engine Oil Viscosity Changed To SAE 10W/30 For Shipment From All U. S. Factories{1318}

1979/08/27 Hardened Washers And Increased Torque Are Now Used On The Bolts Which Fasten The Circle Drive Group To The Circle Drawbar{5207,6153}

1979/08/27 6V190 Clamp Is Available For Use On Sleeve Metering Fuel Systems{0626,1250}

1979/08/27 New Governor Housing Assembly Used In Governor And Fuel Injection Pump Group{1253,1264}

1979/08/27 Steering System Improvements Prevent Possible Damage To Steering Cylinder Sockets{4303,4304,4305,4322}

1979/09/03 Improved Hardware Now Used To Fasten Front Suspension Cylinder To Frame{7201}

1979/09/10 Insulation Sleeve For 5P7360 Tach Generator Now Available {7462}

1979/09/10 Stronger Bolt Now Used With Exhaust Manifold {1059,1307}

1979/09/10 6V2055 High Vacuum Grease Gives Better Oil Seal {1052,1053,1077,0682}

1979/09/10 Undercarriage Disassembly And Assembly Procedures And Specification Charts Are Available {4150,4159,4154,4171,4180}

1979/09/10 New Gasket Used In Water Lines Group For Aftercooler {1380,1063}

1979/09/10 Gasket Added To Rear Wheel Spindle Housing For A Better Seal {4205}

1979/09/10 Different Grease Fitting Now Used In Fan Drive Group {1359}

1979/09/10 Recommendation For Use Of A FLEX-HONE On 1100, 3100 and 3200 Series Engines {1201}

1979/09/10 Tee Handle Hexagonal Wrench In Rack Adjusting Tool Is Now Available For Parts Replacement

1979/09/10 Pin Bore Is Now Offset (Not In The Center) .059" (1.5 mm) In The Piston To Stop Vibration Of The Cylinder Liners Which Can Cause Pitting On The Coolant Side Of The Cylinder Liners {1214,1216}

1979/09/10 Engines Can Use Crankshafts With Either Six Or Eight Counterweights {1202}