1986/03/10 Caterpillar

New Oil Pressure Switch Used With EMS Systems{7485}

Usage:

All 3300 Series Vehicular Engines

Description of Change: The 3300 Series Engine normally has a lower engine oil pressure than other Caterpillar engines. Engine oil pressure switches used on the above engines in EMS applications have actuation pressures that are too high for 3300 Series Engines. At times, the pressure switch can open and activate EMS even though there is nothing wrong.

A new, normally open pressure switch is used on the above engines that closes at 60 kPa (9.0 psi) on increasing pressure and opens to activate EMS at 38 kPa (5.5 psi). This switch should also be used for other oil pressure functions, such as activating electric hour meters.

Adaptable To: The new 7T988 Switch is a direct replacement for either the 9G8010 or 3T4418 Switch used on 3300 Series Vehicular Engines.

Caterpillar Information System:

1986/03/10 Improved Sleeve Bearing Used In Drive End Of Fuel Injection Pump Housing{1253}

1986/03/10 Remanufactured Short Block Available For 3204 Engines{1200,1000}

1986/03/10 Maintenance Free Batteries{1401}

1986/03/10 Nylon Seals Used On Lockwire To Seal Critical Areas; Parts Service Seals Available For NACD Dealers{1257,1264}

1986/02/24 Cleaning Instructions For Oil Coolers With Rubber End Sheets {1366,1375,1376,1378}

1986/02/24 Truck Engine Performance Checklist Available For North American Dealers {0337,0372}

1986/02/24 Longer Bolts Used In Turbocharger Air Lines Groups {1052}

1986/02/24 Air-To-Air Aftercooler Test Group Available {0768,1063,0600}

1986/02/24 New Track Link Assembly And Sprocket Segments Used {4171,4155}

1986/02/17 New Clip Added To Water Lines Group{1380,1350}

1986/02/17 New Fuel Injector Available To Reduce Smoke At Low RPM and Loads{1050,1254}

1986/02/17 New 8T2998 Lubricant Available{0645,1210}

1986/03/10 Engine Oil Filter Element Has Metal Wrapper Instead Of Paper Wrapper{1318}

1986/03/10 Stronger Oil Pan Used{1302}

1986/03/24 Use The Configuration Number To Order Parts For Articulated Dump Trucks{7567}

1986/03/24 New Air-To-Air Aftercooler Arrangements Used On Truck Engines{1063}

1986/03/24 Screens Added To Inlet Air Manifolds{1058}

1986/03/24 Improved Cylinder Head Gasket{1101,1201}

1986/03/24 Incorrect Connection Of Battery Charger Can Open Circuit Breaker And Damage Woodward 2301 Governor Control{1400,1401,4450}

1986/04/07 Requirements For Shipping Wet Batteries In The U.S.{1401,7500}

1986/04/07 Adjust Bridge Whenever Valve Clearance Adjustments Are Made{1121,1105,1100}

1986/04/07 Troubleshooting Solid State Suppressors{4467,4466,4450}

1986/04/07 New Bracket Used In Air Compressor Lines Group{1803,1804,1800}

1986/04/07 Fuel Injection Timing Changed To 15° With New 3.5° Timing Advance{1206,1272,1292}