1999/04/26 Caterpillar

New Pulse Width Modulated Steering Sensor Now Available{4800}

Usage:

AP-1055B (8BM, ABB),
AP-1050B (6ZN),
AP-650B (9DN),
BG-2455C (6TN, ACM),
BG-245C (4XN),
BG-225C (5GN) Asphalt Pavers

A new 168-3551 Pulse Width Modulated (PWM) Steering Sensor is available for the above asphalt pavers. The new sensor has improved moisture resistance due to improvements made in the manufacturing process. The new sensor is a direct replacement for the former 138-4167 PWM Steering Sensor. These changes will provide additional service life.

When servicing the sensor, special attention should be given to the following items:

1. When installing the sensor, it should be adjusted so that the mark on the sensor dial is aligned with the mark on the housing.

2. 9S-3263 Threadlock should be used on the two 2F-7888 Machine Screws. Both machine screws should be torqued to 2.5 ± 0.25 N·m. Over torquing of the two screws will distort the sensor.

3. After installing the sensor, the output of the sensor should be verified. Acceptable ranges are in the following chart:

4. After installation of the sensor is complete, the propel MPC-10 will need to be recalibrated. Refer to KENR2949 for the MPC-10 calibration.

The new sensor is effective with: AP-1055B (8BM399-Up, ABB180-Up); AP-1050B (6ZN195-Up); AP-650B (9DN381-Up); BG-2455C (6TN141-Up, ACM250-Up); BG-245C (4XN123-Up); BG-225C (5GN472-Up).

Reference: 138-7139-02 Control Group

Caterpillar Information System:

1999/04/26 New Oil Pump Group Used{1304}

1999/04/26 Correction To Special Instruction SEHS9737; "Rework Window Regulator On Operator Door"{7308}

1999/04/26 Proper Adjusting Of Body Down Or Up Switch{7258}

1999/04/26 Wheel Bearing Adjustment Procedure For 789 Cast Wheel And High Capacity Bearings{4051,4066,4208}

1999/04/26 New Wheel (Cast) And Required High Capacity Bearings Will Increase Service Life{4051,4066,4208}

1999/04/26 New Caterpillar Monitoring System (CMS) Control Groups Are Available{7490}

1999/04/26 Correct Placement Of Rock Ejector Brackets Eliminates Interference{7157}

1999/04/26 New Hardened Hub Available For Certain Off-Highway Trucks{4050}

1999/04/26 Improved Charge Pump Shaft Increases Life{4306,4344}

1999/04/26 Individual Replacement Guide Blocks Available{4198}

1999/04/26 Puller Tools Available For 3-Point Hitch Draft Sensing Pins{7120,5700}

1999/04/26 Improved Bevel Gear And Pinion Now Used{3254,3256,3258}

1999/04/26 Serviceable Cover Group-Protection Available{5258,1408}

1999/04/26 Stronger Brush Springs Improve Actuator Service Life On Flexxaire Fans{1356}

1999/04/26 Flexxaire Fan Interactive Product Guide CD Now Available{1356}

1999/04/26 Available Rebuild Options For Flexxaire Fans{1356}

1999/05/03 Improved Main Fuel Tank Available {1273}

1999/05/03 New Wiring Harness Assemblies Used On 3500B Machine Engines {1408}

1999/05/03 Improved Cab Harness Accommodates Additional Relay {1408}

1999/05/03 144-0835 Pump Enhancements {1714}

1999/05/03 Serviceable Parts Available For Low Pressure Turbocharger In Low Altitude Engine Arrangement {1052}

1999/05/03 Weld Procedure For Field Repair Of Certain Large Off-Highway Truck Differential Housings {4050}

1999/05/03 New Engine Oil Filler Used {1316}

1999/05/03 Correction To Testing And Adjusting Manual RENR2115-01; Torque Converter Stall And Implement Pump Double Stall - Test {0374,3101,5055,7000}