1990/07/23 Caterpillar

Improvements Reduce Vibration To The Low Water Level Switch On Expansion Tanks{7422,1354}

Usage:

3500 And 3600 Families Of Engines

Description of Change: A new mount, hose assembly, and associated components are used to help dampen vibration in the water level gauge group. The mount is a layered design made from soft natural rubber. The hose assembly replaces a tube assembly which further decreases the amount of vibration. In the former design, excessive vibration could cause inaccurate water level readings and premature switch failure.

Adaptable To: The part number for the improved 7N4885 Water Level Gauge Group has not changed. See the chart for the new part numbers and descriptions. The illustration shows the location of the new parts. This change is adaptable to first production.

Location of the switch (arrow) and the new parts. (A) Front view. (B) Right side view.

Caterpillar Information System:

1990/07/23 Improved Turbocharger Bearing Kit Available For Parts Service{1053}

1990/07/23 Powdered Metal Valve Guides Provide Increased Service Life{1104}

1990/07/23 Dimensions For Aluminum Washer{1221}

1990/07/23 Troubleshooting Forward Warning Horns That Will Not Work{7402}

1990/07/09 Solenoid Contacts May Corrode In 3T2648 Marine Starting Motor Group{1467,1453}

1990/07/09 New Seat Belt Group Increases Operator Comfort{7327,7312}

1990/07/02 What's Your Answer? {0113,5050}

1990/07/02 Magnetic Pins Available To Measure Spline Wear {5070,0762,0763,5058}

1990/07/02 Valve Lifters Can Be Removed Without Removing Cylinder Heads {1112}

1990/07/02 New Spark Plug Seal Used {1555}

1990/07/02 Procedure To Measure Cylinder Liner Projection On 3176 Truck Engines {1216}

1990/07/02 New Fuel Setting Screw Cover And Bolt {1257}

1990/07/23 Bearing Information For SR 4 Generators{4471}

1990/07/30 New Pistons Used{1225,1214}

1990/07/30 New Throttle Shaft Bearing Sleeves Used In Governor Housing Assembly{1365}

1990/08/06 Coolant Loss In 3406B Truck Engines{1395,1355,1100,1124,1353,1216}

1990/08/06 New Rotary Solenoid (Brushless Torque Motor) Used In PEEC Engines{1909}

1990/08/06 Rotor Shaft Length Changed{4457,4472}

1990/08/06 New Caterpillar Parts Identification Label{7567}

1990/08/13 Spacer Available To Eliminate Cracks On Ignition Coil Mounting Bracket{1554}

1990/08/13 Effective Dates, Serial Numbers And Features OF PEEC Personality Modules{1900,1902}

1990/08/13 Changes To Exhaust Manifold Expansion Sleeves And Bolts{1059}

1990/08/13 Stronger Fan Guard Resists Vibration Damage{1360}

1990/08/20 New Aftercooler Gaskets Help Maintain Constant Bolt Torque {1063,1079}