1984/04/09 Caterpillar

Overvoltage Protection For Woodward 2301 Governor{1289}

Usage:

All Engines Equipped With Woodward Model 2301 Governors

Description of Change: A preregulator is available to give high voltage protection to the Woodward 2301 Governor. Voltage higher than 40 volts can cause governor failure. The preregulator will limit the governor supply voltage to 36 ± 2 volts. There are four main causes of governor failure that can be eliminated by use of this preregulator.

1. Battery disconnect during operation. Engine driven alternators and battery chargers give positive voltages that can cause damage if the battery becomes disconnected during operation.

2. Nickel-cadmium battery systems. Charging rates on 32 volt nickel-cadmium battery systems can be above 40 volts.

3. Reverse voltage damage. Incorrect wiring installation can cause reverse polarity voltage to the governor supply circuit. This also can result in permanent damage to the Woodward 2301 Governor.

4. Wiring shorts. Incorrect wiring installation can also result in actuator lead shorts that would damage the Woodward 2301 Governor.

NOTE: Two extra fuses, all necessary wiring and Special Instruction, Form SMHS8345, are supplied with each preregulator.

Adaptable To: The 4W5391 Preregulator is adaptable to all Caterpillar Engines with Woodward 2301 Governors.

Caterpillar Information System:

1984/04/09 Bypass Valve Can Be Installed To Keep Prelubrication Oil At The Correct Level{1319}

1984/04/02 6V3176 Relief Valve Available For Center Hole Double Acting Hydraulic Cylinders {0623}

1984/04/02 Service Tools With Dual Scale (U.S. Standard And Metric) Will Again Be Available {0623,0653}

1984/04/02 Bolt Used Instead Of Stud In Governor Fastener Group To Prevent Damage To Governor Housing {1264,1287}

1984/04/02 Assembly And Installation Of Duo-Cone Seals {7555}

1984/03/26 New Ahead Clutch Pilot Bearing Assembly Used On Main Shaft{3302}

1984/03/26 New Pressure/Torque Conversion Decal Available For 6V200 Hydraulic Wrench{0614,0611}

1984/03/26 Fuel Setting And Air Fuel Ratio Control Adjustment Tools For 3406B Engines{0650,1264,1257,1278}

1984/03/26 New Connecting Rod And Main Bearings Used{1230,1219,1203}

1984/03/26 Service And Troubleshooting Information For Electrical Systems{1400,1450,5700,7300,7400,7450}

1984/03/12 Use Of Impact Wrench To Tighten Counterweight, Main Bearing Cap And Connecting Rod Bolts{1202,1203,1218,1219,1230}

1984/03/12 Check Cylinder Heads For Water Passage Plugs{1100,0374}

1984/04/09 New Adapter Assemblies And Clamps Hold Fuel Nozzles In Position{1106,1252}

1984/04/16 How To Recognize And Reduce The Effect Of Moisture On SR4 Generator Windings{4450,4453,4454}

1984/04/16 New Oil Filter Base Assembly Used In Filter Base Group{1306}

1984/04/16 Piston For Rectangular Rings Available Again{1214,1215}

1984/04/23 3406 Remanufactured Truck Engines Available{1000}

1984/04/23 Repair Of Drain Plug Threads In Oil Pan{1302}

1984/04/23 Dimensions For Reconditioning Cylinder Blocks, Cylinder Heads{1201,1101,1103,1105}

1984/04/23 Only The External Needle Valve Can Be Adjusted On Woodward EG3P or EG10P Actuators{1265,1289}

1984/04/23 Correct Oil Level And End Play Settings For Marine Transmission{3303,3305,3354}

1984/05/07 New Hoses In Water Lines Group Give Better Performance At Higher Temperatures; New Hose Clamps Also Used{1050,1059,1350}

1984/05/07 Install Muffler With Drain Hole Down{1062}

1984/05/07 New Recommendation For Oil Hole Location During Installation Of Camshaft Bearings{1211}