New Air Conditioner Thermostatic Switches Used {7337}
Usage:
All Models With Air Conditioning Systems Using 9P3498, 7T9277, Or 3V0253 Thermostatic Switches
Description of Change: Three new switches are used for the air conditioning systems. The new thermostatic switches have improved internal parts. The parts are made of copper to resist stress corrosion and breakage. This resulted in poor service life of the switch.
Adaptable To: The new 9X5445 Switch is a direct replacement for the former 7T9277 Switch (canceled). The new 9X5446 Switch replaces the former 9P3498 Switch. The new 9X5447 Switch is a direct replacement for the former 3V0253 Switch (canceled). This change is adaptable to all machines with air conditioning systems using one of the former switches.
Caterpillar Information System:
1990/03/12 9W2126 Module (Relay Module){7490}
1990/03/12 Idle Shutdown Timer Used In Auxiliary Power Applications{1705,1706,4267}
1990/03/12 Shorter Bolt Used To Hold Oil Pan Drain Cover{1302}
1990/03/12 New Rear Gear Group Has Spur Gears Instead Of Helical Gears For Longer Service Life{1204,1206,1212}
1990/03/12 New Hand-Held Microfiche Reader Available{0354,0374}
1990/03/12 New Loupe (Magnifier) Available For Inspecting Failed Or Broken Parts{0777}
1990/03/05 New Piston Pin Retainer Used In 3600 Family Of Engines{1214}
1990/03/05 New Basic Turbocharger Groups And Cartridge Groups With Improved Compressor Seals, Thrust Bearings, And Hollow Shaft For Reduced Heat Soak{1053,1077}
1990/03/05 New Plug Used In Front Housing For Fuel Injection Control Group{1151,1298}
1990/03/05 2N4620 Rubber Drive Block Reinstated For Parts Service{3305}
1990/03/05 Preventive Maintenance (PM) Kits Available For 3116 Truck Engines{7258,0645,1261,1318,1352,7542}
1990/03/05 New Fuel Inlet Fitting Eliminates Breakage; New Screen Used In Inlet Fitting{1250,1252,1261}
1990/03/19 Possible Overvoltage Conditions From Output Of VR3 Voltage Regulator {4467,4474}
1990/03/26 New Oil Control Piston Ring Used In 3300 Family Of Engines {1213,1214,1215}
1990/03/26 New Personality Modules Require New Service Program Modules {1902}
1990/03/26 Caterpillar Announces 460 hp 3406B (5YG) Heavy-Duty Diesel Truck Engine {1000}
1990/04/02 Correct Replacement Of Forward Warning Horns{7402}
1990/04/02 New Flywheel Ring Gear Available To Improve Starter Engagement{1158,1454}
1990/04/02 New Valve Lifter Improves Oil Flow To Top Of Engine{1112,1119}
1990/04/02 Correct Torque Required For Bolts In Rear Gear Groups; Specification Omitted From Some Service Manuals{1204,1237,7568}
1990/04/02 Improved Filter Service Film For Duplex Fuel{1261,7557}
1990/04/02 What's Your Answer?{0315,1000,1250,3000}
1990/04/09 New Turbocharger Group For 3512 (24Z) High Speed Generator Set Engines{1052}
1990/04/09 Improvements, Maintenance and Troubleshooting Information For Electric Starting Motors{1453,7521,7524,7526}