New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For the Tachometer Drive Group And Transfer Pump{7462,1256}
Usage:
3408 and 3412 Engines In All Applications;
988B and 992C Loaders;
631D, 633D, 637D and 637D P.P. Tractors
Description of Change: The tachometer drive groups for the above models now have a different design adapter assembly. The shaft of the adapter assembly is held in a vertical position by the tachometer drive housing. Formerly, the shaft was supported (held) by the part into which it was assembled. In this position it was possible for the shaft to fall out of position and permit the tachometer drive seal to be damaged. As a result of this, dirt got into the transfer pump and caused the seals to be damaged.
Adaptable As: Direct replacement on all earlier models shown.
Caterpillar Information System:
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}
1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}
1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}
1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}
1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}
1978/02/06 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System{1350}
1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}
1978/03/06 Stronger Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}
1978/03/06 5P8558 Pressure Gauge Calibrating Group Checks Pressure Gauges{0650}
1978/03/06 Use Again Specifications For Valve Springs Are Changed{1108}
1978/03/06 New Starter Motors Have Solenoid On Top Of Starter{1407,1453}
1978/03/13 5P8687 Tee Test Tooling Group{0651,5050}
1978/03/13 When A 6N5906 Hour Meter Will Not Operate Correctly, Check The Electrical Supply Before A Replacement Hour Meter Is Installed{7480,1400}
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}