1980/08/25 Caterpillar

Vibration Isolators Used With Vacuum Switches For Air Filter Service Indicators{7452,1051,1054}

Usage:

All Caterpillar Products Equipped With 7N4350 Or 7N4351 Vacuum Switch Assemblies

Description of Change: Vibration isolators are now used with all 7N4350 and 7N4351 Vacuum Switch Assemblies on Caterpillar products so equipped. The vacuum switches are used in electrical circuits for air filter service indicators. Use of the vibration isolator as a mounting for the vacuum switch prevents possible switch damage caused by vibration in some conditions of operation, and extends the service life of the switch.

Adaptable To: The 8N2242 Isolator Assembly is adaptable to all Caterpillar products that use either the 7N4350 or 7N4351 Vacuum Switch Assembly. The recommendation is to install an 8N2242 Isolator Assembly as a mounting for either the 7N4350 or 7N4351 Vacuum Switch Assembly in all applications. An A2926 Nipple (1/8 Pipe), or similar 1/8-27 NPT pipe nipple is needed for installation of the 8N2242 Isolator Assembly.

Caterpillar Information System:

1980/08/25 Service Meter Correction Decal Available{7478,7480}

1980/08/18 Some Valve Lifter Assemblies Have A Black Color On The Finished Surface{1209}

1980/08/18 Alcohol Fuels Are Not Recommended For Use In Caterpillar Diesel Engines At The Present Time{1280,0374}

1980/08/11 Higher Capacity Auxiliary Pump Group Is Now Available{1371}

1980/08/11 Carbon Cutting On Thrust Side Of Piston Top Land Is Normal Condition For Pistons With Offset (Not In Center) Pin Bores{1213,1214}

1980/08/11 Improved Power Takeoff Service Kits{3055}

1980/08/11 New Single Key Lock System Uses The Same Standard Key For All Locks{7300,7550}

1980/08/11 Improved Piston Ring Used At Turbine End Of Turbocharger{1052,1053,1077}

1980/08/11 New Oil Filter Base Has Larger Oil Passages; Some Bases Need Modification{1306}

1980/08/11 6V2196 Microscope Available For Inspection Purposes{0653}

1980/08/11 6V3030 Digital Multimeter, 6V3031 Case And 6V3032 Test Lead Kit Are Now Available For Troubleshooting Electrical Circuits And Components{0651}

1980/08/04 Pistons Which Use Keystone-Type Rings Can Be Installed In Place Of Pistons Which Use Rectangular-Type Rings{1215,1214,1213}

1980/08/25 Special Bolts Available For Better Protection Against Modifications Of Fuel System And Governor Settings{1264,1278}

1980/09/01 Four Fabricated Tools Available For Use During Disassembly And Assembly Of Piston-Type Hydraulic Motors{5058,0622}

1980/09/01 6V2086 And 6V2087 Seal And Wear Sleeve Installers Available{0622,1160,1161}

1980/09/01 6V2119 Profile Tool Group Is Available For Inspection Of All Crankshafts In Caterpillar Engines{0653,1202,1203,1219,1230}

1980/09/01 CAUTION: Procedure For Adjustment Of Fuel Rack Setting On Hydramechanical Governors Has Been Changed{0654,1250}

1980/09/01 5P1746 Governor Sealing Tool Available Separately{0620,1264,1286}

1980/09/08 Cartridge Repair Kit Available For AiResearch Turbochargers{1052,1053}

1980/09/08 Oil Pump And Lines Group Changed To Use Different Method Of Flow Control For Emergency Lubrication System{3310,3311}

1980/09/08 Easy-To-Make Tool Holds Fuel Injection Nozzles According To Cylinder Number{0634,1254}

1980/09/08 New Oil Scavenge Tube Assemblies Used In Oil Lines Groups{1307,1312}

1980/09/08 4S6553 Engine Evaluation Test Instrument Group Has Been Canceled{0651}

1980/09/08 6V3143 Distorter Adapter Available For Use With 5P7409 Wear Sleeve Distorter For Removal Of Crankshaft Wear Sleeves{0621,1202,1160,1161}