1989/07/24 Caterpillar

Separate Grounding Of Throttle Limit Switch And Shutoff Solenoid Improves Component Reliability; New Throttle Limit Switch Used{1269,1155,1400}

Usage:

3406B ( 8TC, 4MG ) Truck Engines Equipped With BrakeSavers

Reference: Special Instruction, Form SEHS9080, "Installation of 9X0239 Throttle Limit Switch on 3406B Truck Engines Equipped With BrakeSaver."

Description of Change: A new throttle limit switch group is used on 3406B Truck Engines equipped with BrakeSavers. Also, the throttle limit switch assembly and the shutoff solenoid group are now separately grounded for improved component reliability.

Adaptable To: The new 9X0239 Switch Assembly, which replaces the former 6T1990 Limit Switch Assembly, is effective with serial numbers 8TC7477-Up and 4MG52109-Up. See Special Instruction listed in reference above for additional parts needed and installation procedures. The 8C9986 Shutoff Solenoid Group is grounded separately on engines with serial numbers 8TC1413-Up and 4MG3600-Up.

Location of shutoff solenoid group and throttle limit switch assembly.

Caterpillar Information System:

1989/07/24 Subscription Service Available For ECAP And DDT Service Program Modules{0782,1705}

1989/07/24 Check The Radiator Fan Spider Assembly When Doing Yearly General Maintenance{1356}

1989/07/24 New Publication Available, "Ultrasonics Guide"{0374}

1989/07/24 New Publication Available, "Metal Spray Guide"{0374}

1989/07/17 PEEC Training And Diagnostic Training Program Available{0314,0372,1705}

1989/07/10 New, Larger Vibration Damper Improves Wear Life{1205}

1989/07/10 New Viton Rubber Seals Used{1302,1307,1312,1306,1317,1200}

1989/07/03 Use Same Torque For All Sizes Of Threaded Crown Hydraulic Cylinders{5100,7562}

1989/07/03 Air Conditioning Service Tooling{0757,0786,7320}

1989/06/26 New Connector With An Orifice Added To Fuel Injection Lines Groups To Help Prevent Cavitation{1274}

1989/06/26 Damper Groups Improved To Help Prevent Leaks Of Viscous Fluids{1205}

1989/06/26 Change Routing Of Heater Return Hose To Improve Heater Efficiency{7304,1361}

1989/07/24 Shock Mounts Give Longer Life To 9F3099 Switch Assembly (Starter Relay){1426,1450}

1989/07/24 Engine Oil Coolers With New Rubber End Sheet Available For Parts Service{1378}

1989/07/24 Stronger Spacer Plate Prevents Cracking{1221,1350}

1989/07/24 Improved Control Rod Assembly Used In Fuel Injection Control Groups{1298}

1989/07/24 New Cylinder Head Gasket Kit Available{1101,1216}

1989/08/07 Replacement Parts For Magnetos Discontinued On Gasoline Starting Engines {1530,1500}

1989/08/07 Pedal-Mounted Throttle Sensor Requires New Personality Module {1265,1705,1707}

1989/08/07 Improvements To Attachment Altronic® Ignition Systems {1550,1555,1558,1567}

1989/08/07 Temperature Sensor Pocket Kit Available For Danfoss® Temperature Contactors {1350,7403}

1989/08/07 Do Not Reuse Clutch Housing Bolts {3360,3305,3306}

1989/08/14 Worldwide Service Directories Available For Marine, Petroleum, Power Generation Products{0354,0370,0374,0375,1022,4450}

1989/08/14 New Coolant Conditioner Elements Available{1352}