Sealing Threads On Switches And Sensors That Are Grounded Through The Case{1400,1900,3175,7422,7493}
Usage:
All Machines So Equipped
When replacing fluid level switches, temperature switches, temperature senders, etc. which are case-grounded through the pipe threads (single wire output) DO NOT use teflon tape to seal the threads. Use pipe sealant such as 5P3413 Pipe Sealant, which contains teflon, to seal liquids and gases up to 149°C (300°F). This only applies to pipe thread type devices. It does not apply to O-ring type devices which need no sealant.
Teflon tape may insulate the electrical connection between the switch (sender) threads and the block or tank causing the device to work incorrectly. In hydraulic applications, teflon tape can also become lodged in valves causing incorrect operation of hydraulic components.
Caterpillar Information System:
1990/09/24 Two New Coolant Flow Switches Used On Machines Equipped With Electronic Monitoring System (EMS){1361,7422,7470}
1990/09/24 Improved Access To Hydraulic Oil Level Indicator Harness{7490}
1990/09/24 New Fixed Length Door Stop Used{7308}
1990/09/24 Seal And Seal Holder In Transfer Gear Groups Now Serviced As One Piece{3159}
1990/09/24 New 6R2915 Seal Kit Available For 8C3866 Upper Conveyor Drive Motor{4351}
1990/09/24 Field Installation Kit Available To Install Magnetic Clutch-Type Water Spray Pump, Cutter Drum Interlock, And Kick-Back Shoe{1408,5614,6601,7493}
1990/09/24 New Components Improve Propel And Throttle Adjustments{1265,3209}
1990/09/24 New Support Plate Assembly And Spacers Used{6607}
1990/09/24 Procedure To Eliminate Implement Hydraulic Hesitation{5129}
1990/09/17 Improved Exhaust Shield Groups Provide Easier Assembly And Serviceability {1067,1073}
1990/09/17 New Bevel Gear Group In Differential And Bevel Gear Group Has Different Gear Tooth Design To Increase Service Life {3280,3254,3256}
1990/09/17 New Hoist Diverter Valve Group Eliminates Spring Breakage {5066}
1990/09/24 Standard Oval And High Temperature Oval Head Seals Available For Certain Hydraulic Cylinder Applications{7555,5102,5456}
1990/09/24 Add Bolt Dampers To Oil Pump Mounting Bolts to Prevent Bolt Failures{1304}
1990/10/01 New Magnetic Sensor Has Improved Shell And Potting Compound {7463,3175}
1990/10/01 New Governor Control Bracket Used To Prevent Bolt Loosening {1265}
1990/10/01 What's Your Answer? {0114,1400}
1990/10/01 Correct Light Bulb Replacement For The 8T9290 Borescope; New Light Bulb Used {0777}
1990/10/01 New 4C6090 Multichannel Temperature Selector Available To Aid In Diagnosing Low Power Complaints {0781}
1990/10/01 Incorrect Installation Of Slow-Moving Vehicle Sign (Triangle) May Affect Cooling Performance {7405,1353,7557}
1990/10/01 Answers To Quiz In This Issue {0114,1400}
1990/10/08 Gerotor Charge Pump Used On Propel Pump; Inadequate Charge Pressure May Occur{3204,4320,5070,5082,7428}
1990/10/08 Correct Installation Of Brake Piston Seals{4251}
1990/10/08 Serviced Parts Available For 8C4773 Electric Starting Motor Group{1453}