1983/08/22 Caterpillar

Improved Voltage Regulator Assembly Now Used{4450,4467}

Usage:

All Small Frame SR4 Generators With Single Phase Wave Excitation

Description of Change: A new voltage regulator assembly is now used in the above generators. The new regulator design uses a new A1 and A2 module regulator assembly and a new R3 gain rheostat. The new A1 module uses a solid state voltage build-up circuit instead of a mechanical relay. The new A2 module uses a new rectifier that has a higher current rating and has faster recovery (return to normal condition). This decreases electrical noise and radio interference.

The new 500 ohm R3 gain rheostat has a larger diameter wire than the former 5000 ohm rheostat and will give a longer service life.

Adaptable As: The new regulator assemblies are a direct replacement for the former regulator assemblies as shown in the chart. The former parts are canceled.

For field replacement of the former A1 module regulator assemblies, a replacement kit is available. The kit has a new A1 regualtor assembly and R3 gain rheostat with a Special Instruction, Form SEHS8323. The Special Instruction gives complete installation instructions. See the chart for the replacement kit part numbers.

Caterpillar Information System:

1983/08/22 New Differential Pinion And Ring Gear Make Less Noise{3280}

1983/08/15 Replacement Parts And Service For 6V3021 Crimping Tool And 6V3022 Cable Cutter{0610}

1983/08/15 New Water Seals Used In Cylinder Head Groups{1115,1101}

1983/08/15 New Fuel Ratio Control Group Has Improved Diaphragm{1278,1257,1251}

1983/08/15 Troubleshooting Engine Vibration; Damper Adapter Can Be Changed{1205,1000}

1983/08/15 New Bolts And Axle Housings Used{3260}

1983/08/15 Different Discs And Thrower Used In Flywheel Clutch Group To Prevent Damage From Heat{3052}

1983/08/15 3512 Generator Set Engines (1500 And 1800 RPM) Must Use Flywheel Balance Weights{1156}

1983/08/15 Digital Tachometer Available{7462}

1983/08/15 Recommendations To Avoid Piston Seizures{1214,1213,1215}

1983/08/15 Repair Of Damaged Threads{0660}

1983/08/15 Keep Alternators Without Pulleys In A Horizontal Position During Installation To Prevent Internal Damage{1405}

1983/08/22 New Governor Drive Gears And Weight Assemblies{1264}

1983/09/05 New Grease Fitting Used In Blade Lift Group{5205}

1983/09/05 Use Of Steering Clutches To Put A Load On An Engine Can Damage Or Destroy The Clutch Discs{4101,4109,0374,1000}

1983/09/05 New Inspection Report Forms Available{0336,0372,7550}

1983/09/05 New Piston Oil Rings{1215}

1983/09/05 6V3100 Engine Timing Indicator Group May Have 6V9710 Or 6V2192 Transducer{0651}

1983/09/05 Engine Maintenance Information Films Available{1318,1352,0375}

1983/09/12 New Dust Covers Available For Twin Disc IBF318 And IBF321 Rear Power Take-Off Clutches{3055}

1983/09/12 New Grease Lines Groups Make Lubrication Of Front And Rear Suspension Cylinders Easier{7201,7113}

1983/09/12 Parts Service Information For Pistons, Connecting Rods, Piston Pins And Rings{1214,1225,1215,1218}

1983/09/26 Oil Shield And Rotocoil Must Be Installed Together For Acceptable Oil Control{1109}

1983/09/26 Service Information For Woodward Governors{0374,1264}