1997/02/24 Caterpillar

New Electronic Transmission Control Group Used {3032,3100}

Usage:

814F (9DM) Wheel Tractor;
815F (1GN) Soil Compactor;
816F (5FN) Landfill Compactors;
950F (2LM, 4DJ, 5PJ, 5SK, 6LL, 6YG, 7ZF, 8TK),
966F (1SL, 3XJ, 4YG, 6FJ, 6ML, 8BG, 9YJ),
970F (7PL, 7SK, 9JK),
980F (4RN, 5XJ, 8JN) Wheel Loaders

Reference: Service Manual Module, SENR5922, "Electronic Transmission Control System Operation, Testing And Adjusting".

Description of Change: A new transmission control group is now used. The new transmission control group has improved software which enhances the following features:

1. Shift logic while loading in the pile while in Automatic mode.

2. Second gear to first gear operator initiated downshift logic while in Automatic mode.

3. Downshift logic during a third gear directional shift.

Adaptable To:

The new 136-1688 Transmission Control Group directly replaces earlier "autoshift" controls including 126-6648, 124-0499, 121-3412, and 112-5149 Transmission Control Groups. A partial list of effective serial numbers is shown in the chart.

Caterpillar Information System:

1997/02/24 New Radiator Group Includes Improved Radiator Core Assembly {1353}

1997/02/24 Correction To Lift Arm Position Sensor Adjustment {0685}

1997/02/24 New Longer Thrust Pin And Bolts Now Used In Rear Suspension Cylinders To Increase Service Life Of Joint {7213,7201,7200}

1997/02/24 Service Parts Are Available For 9T-4785 Accumulator Group {4331,5077}

1997/02/24 New Sight Gauge On Rear Axle Housing Improves Serviceability {3260}

1997/02/24 Thicker Washer Used To Allow Proper Fastening Of Elbow In Transmission Oil Lines Group {3154,3030}

1997/02/24 New ECM Controlled Variable Speed Fan Clutch Group Available {1356}

1997/02/24 Special Instructions Now Available For 793C Off-Highway Truck Assembly Procedure {0374}

1997/02/24 New Hydraulic Oil Temperature Sender And Hydraulic Oil Temperature Gauge More Responsive {7450,7488}

1997/02/24 New Water Temperature Regulator Improves Cab Heating In Cold Weather Conditions {1350,1355}

1997/02/24 Some Service Parts Available For Engine Fuel Injection Pump {1251}

1997/02/24 New Tooling Simplifies Steering Pump Neutral Adjustment {5070,0738}

1997/02/24 Service Manual, Secondary Steering System, Supplemental Information Available {4300,4306,4307,4324,4339,7568}

1997/02/24 Wiper Arm Retaining Nut Requires Tightening After Initial Operation {7305}

1997/02/24 New Bevel Gear Set For Telehandler Front And Rear Differential Groups Improves Service Life {3256}

1997/02/24 New Telehandler And Material Handler Differential Lock Parts Improve Service Life {3258,3264}

1997/02/24 Cold Weather Steering For Telehandlers Improves With Additional Parts {4300,4307}

1997/02/24 Improved Hydraulic Oil Level Gauge For Telehandlers {5057,5050,5056,7479}

1997/02/24 Lubrication Pump Group Container Assembly Now Available As A Serviceable Part {7540,7510}

1997/02/24 Resetting Event Recorder And Service Lamp For VIMS {7601}

1997/02/24 Information Needed For VIMS Support {7601}

1997/03/03 Service Manual, SENR8457, "Challenger 35, Challenger 45, Challenger 55 Agricultural Tractors Tooling And Parts Serviceability For Electrical Connectors" Now Available {0350,1400}

1997/03/03 Revised Service Manual Module For Transmission Electronic Control Available {3168,3030}

1997/03/03 New Line Relief Valves Reduce Cylinder Drift And Improve Performance {5100,5117}