1981/09/21 Caterpillar

New Dual Speed Switch Is Now Available{7418,7410,7411,1400}

Usage:

All Industrial, Marine, And Generator Set Engines Equipped With 5N8328 Or 3N9596 Dual Speed Switch Assemblies

Description of Change: A new dual speed switch is available for use on the above engines. The switch controls two separate speed conditions. One part of the switch controls the speed at which the starting motor pinion will disengage from the engine flywheel. The other part of the switch will cause the engine to stop operation if the engine overspeeds (runs too fast).

The former switch assemblies have had some failures because moisture (water) got into the inside of the cover assembly. This moisture damaged the electrical circuits of the switch assemblies.

The cover assembly in the new switch is more rigid and permits a better seal between it and the case. The changes will give the switch a longer service life. No changes were made to the operation of the electrical circuits.

Adaptable To: The new 5N8947 Dual Speed Switch Assembly is a direct replacement for the former 5N8328 and 3N9596 Switch Assemblies which have been canceled.

Caterpillar Information System:

1981/09/21 Preventive Maintenance For Natural Gas Engine Spark Ignition System{1550,1552,1555,1558}

1981/09/14 Spring Pins No Longer Used In Water Pump Drive Gear {1361}

1981/09/14 Low Idle Instability: New Low Idle Setting {1264}

1981/09/14 Timing Pin Removed From Governor And Fuel Injection Pump Group; Change To Service Manuals {1286}

1981/09/14 Exhaust Manifold And Air Lines Changes Prevent Broken Studs And Exhaust Leaks {1059,1061}

1981/09/14 Troubleshooting: Water Pump Failures {1361,1350}

1981/09/14 Changes To BrakeSaver Groups Give Longer Service Life {1155}

1981/09/14 Updated, Improved Issue of Special Instruction, "Bench Testing Hydraulic Components," Now Available {0374,5050}

1981/09/14 New High Pressure Quick Disconnect Couplers And Nipples For Hydraulic Test Equipment {0651}

1981/09/07 New Support Prevents Vibration Of Left Side Oil Filters{1306,1318}

1981/09/07 One-Piece Panel Used For Oil Pan Sound Suppression{7260,1801,1302}

1981/09/07 New Exhaust Gas Recirculation Solenoid Used{1080}

1981/09/21 Use Only EPA-Approved Rack And Idle Setting; Change Seal, Date Plate{1257,1251,1264}

1981/09/21 Lubricant Gives Protection To Camshaft And Roller During Initial Start-Up{1210,1209}

1981/09/28 Oil Pan Drain Plug Has More Threads{1302}

1981/09/28 Wrong Assembly Or Adjustment Of Governor Linkage Can Cause Failure{1289,1264,1265}

1981/10/05 Service Manual Information About Inside Diameters Of Valve Guides{1104,0374}

1981/10/05 Hydraulic Cylinder Repair Stands And Kits Now Available From Caterpillar Parts Department{0623,0626}

1981/10/05 New Torque Specifications For Flared And O-Ring Fittings{5057,7553}

1981/10/05 New Piston Ring Group For Parts Service In Natural Gas Applications{1215}

1981/10/05 Bolt Torque Specifications Changed For Crankshaft Pulley And Power Take-Off Adapter{1205,1165}

1981/10/12 New Cylinder Block Permits Use Of A Small-Frame Turbocharger{1201,1052}

1981/10/12 Use Of Engine Supports On Flywheel Housing Can Change Face And Bore Runout Measurements{1157}

1981/10/12 Engine Slobbering; New Piston And Rings Used{1214,1215,1000,1225,1104,1052}