1986/04/21 Caterpillar


Three Element Speed Switch Replaces Dual Element Speed Switch{7418,7411,7410,7421}

Usage:


All Industrial, Marine, And Generator Set Engines Except 3500 Series

Description of Change: A new three element switch assembly is used in place of the former dual element switch assembly on all engine applications except 3500 Series Engines. The new switch has the following improvements:

... Three elements, instead of two, are used.

... There are four extra mounting holes.

... "Overspeed" does not show if the magnetic pickup is disconnected.

... The "crank terminate" contacts (terminals 10, 11, 12) remain actuated for two seconds after the engine stops.

...The switch is less affected by electrical noise, excessive voltage, and voltage spikes.

Adaptable To: The new 7W2743 Switch Assembly can be used as a replacement for the former 5N8947 Switch Assembly which is canceled. Special Instruction SEHS8486 covers the installation of the new switch (terminals 2 through 12 have same function as on former switch).

Caterpillar Information System:

1986/04/21 New Tool Available To Measure Propeller Pitch{0600,3305}
1986/04/21 Silicone Rubber Hoses Available For Engine Oil Cooler Water Lines{1378,1380}
1986/04/21 New Alternators Are Self-Energizing And Have Built-In Regulators{1405}
1986/04/07 Bleed Screw Washer (Seal) Must Be Replaced If Bleed Screw Removed From Fuel Nozzle{1254}
1986/04/07 New Index Lists Engine Special Instructions By SMCS Code{1000,0374}
1986/04/07 Fuel Injection Timing Changed To 15° With New 3.5° Timing Advance{1206,1272,1292}
1986/04/07 New Bracket Used In Air Compressor Lines Group{1803,1804,1800}
1986/04/07 Troubleshooting Solid State Suppressors{4467,4466,4450}
1986/04/07 Adjust Bridge Whenever Valve Clearance Adjustments Are Made{1121,1105,1100}
1986/04/07 Requirements For Shipping Wet Batteries In The U.S.{1401,7500}
1986/03/24 Incorrect Connection Of Battery Charger Can Open Circuit Breaker And Damage Woodward 2301 Governor Control{1400,1401,4450}
1986/03/24 Improved Cylinder Head Gasket{1101,1201}
1986/04/21 Correct Position Of The Bleed Hole In The Fuel Line Adapter{1252}
1986/04/21 Fittings Added To Jacket Water Heater Hose To Prevent Interference With Folded Core Radiator{1353,1383}
1986/04/21 New Wire Assemblies And Spark Plug Insulators Improve Service Life Of Ignition System{1558,1555,1552,1408}
1986/04/21 New Conversion Groups Available To Convert From Hydramechanical Governors To Woodward PSG Governors{1289}
1986/04/21 Use Care When Removing Oil Pan And 9N3167 Plate{1302}
1986/05/05 New Publication Lists Service Manual Modules for Caterpillar Earthmoving And Engine Service Manuals{0374,0375}
1986/05/05 Be Sure The Polarity Of The Electrical Connector On EG3P Woodward Actuator Assembly Is Correct{1265,1250}
1986/05/05 Portable Hydraulic Pump Group Available{0600}
1986/05/05 FT Tooling Prints Available For Bushing Installation In Governor Housing{0600,1287}
1986/05/05 Service Reminders For 3400 Family Of Diesel Engines{1204,1214,1331}
1986/05/05 Special Editions of Service Magazine And How To Find Them{0374}
1986/05/12 Top Shaft Wear Sleeve For 7241 Marine Transmissions Can Be Used On 7231 Marine Transmissions{3306}
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