When A 6N5906 Hour Meter Will Not Operate Correctly, Check The Electrical Supply Before A Replacement Hour Meter Is Installed{7480,1400}
Usage:
Many of the 6N5906 Hour Meters that dealers return to the factory for warranty do not have a defect. Before you remove one of these hour meters and install a replacement unit, use a volt-ohmmeter or a continuity light to check the electrical wires and/or connections and the oil pressure switch. Loose fasteners, connections with corrosion and/or bad electrical wires can be the problem instead of the hour meter.
When an hour meter is connected to a 24 volt system it will be approximately one minute before it begins to operate. Operation can be seen by the cycles of a "+" and "0" on the meter dial. Once the meter starts to operate, it will cycle at intervals of approximately 36 seconds.
Caterpillar Information System:
1978/03/13 5P8687 Tee Test Tooling Group{0651,5050}
1978/03/06 New Starter Motors Have Solenoid On Top Of Starter{1407,1453}
1978/03/06 Use Again Specifications For Valve Springs Are Changed{1108}
1978/03/06 5P8558 Pressure Gauge Calibrating Group Checks Pressure Gauges{0650}
1978/03/06 Stronger Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}
1978/02/27 New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For the Tachometer Drive Group And Transfer Pump{7462,1256}
1978/02/27 Modification Of Oil Pan For Installation Of Oil Sump Heater{1302}
1978/02/27 Improved Fuel Priming Pump Assembly Has Better Sealing Characteristics; Repair Kit Available For Knob{1258}
1978/02/27 Stronger Exhaust Manifold Gasket Now Used{1059}
1978/02/27 Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit{1202,1160,1161}
1978/02/27 Fabricated Adapters Permit Horizontal Mounting Of Transmissions On 1P2420 Transmission Repair Stand{0640}
1978/02/27 New Seal Assembly With Longer Ferrule Prevents Damage To Ferrule During Cylinder Head Installation{1100,1101,1300}
1978/03/13 Soft Washers And Lockwashers Are Now Used With The Mounting Bolts For Air-Fuel Ratio Control{1278,1264}
1978/03/13 The Causes And Reduction Of White Exhaust Smoke During Cold Engine Starts; Maintenance Aids Available To Decrease This Problem{1250,1383,1050}
1978/03/20 "Danger Do Not Operate" Tags Now Available{0374}
1978/03/27 Use 5P8706 Die Repair Kit For The Repair Of 9S6331 Die Assembly{0623}
1978/03/27 5P8675 Extension Handle Available For General Uses{0614}
1978/03/27 Improved Thrust Washers Now Used With Planet Gears{3000,3072,3106,3110,3003,3001,3100,3116,3159,3176,3107,5150,5165}
1978/03/27 9N3700 Or 9N3299 Nozzle Assemblies Must Be Used On 3208 Engines That Are Equipped With Exhaust Gas Recirculation (EGR){1254}
1978/03/27 How To Find Correct Oil Change Intervals For Truck Engines Operated In Short Distance Applications (Pick Up And Delivery Service){1318,7500,0374}
1978/03/27 5P4149 Conversion Group To Become A Discontinued Item On October 1, 1978{0650,1254}
1978/03/27 More Torque Now Used To Tighten The Retainer Nut For Turbocharger Compressor{1052,1053}
1978/03/27 Correct Adjustment Of The Governor Control Linkage In Truck Engines Is Necessary To Prevent Low Power{1265,1269}
1978/04/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions{3000,1156,1157}