Do Not Use Lubricant On Sticking Start (Ignition) Switches{1416}
Usage:
Field returns of switches, like 9G7641 Start Switch Group, show a penetrating oil (like WD-40®) has entered the contact cavity of the sealed switch. This part of the switch assembly is sealed against moisture and dirt. Light penetrating lubricants can get past the tumbler seal and cause intermittent or open contacts. The result is a switch that will not turn on the main power relay or crank the engine.
Sticking or hard-to-operate switches should not be "fixed" with light lubricants. They should be replaced immediately and listed as "part causing failure" on an applicable claim or SIMS report.
For hard-to-insert keys, use only a dry graphite lubricant like Caterpillar 1U8268 Dry Film Lubricant in the tumbler and on the key.
Caterpillar Information System:
1990/03/05 4C5623 Smoke Candles Can Help Locate Air Leaks in Cab{7301,7325}
1990/02/26 New Inlet/Exhaust Valve With Improved Valve Seat Angle, New Valve Guide, New Cylinder Head Assemblies With New Inlet Valve Seats {1100,1103,1104,1105}
1990/02/26 Welded Crankshafts {1202}
1990/02/26 Improved Head Gasket Used; Service Tips {1124,1216,1221,7568}
1990/02/26 New Water Temperature Regulator Used {1355,1353}
1990/02/26 Improved 1W2076 Cover Used In Fuel Ratio Control Group {1278}
1990/02/26 Resealing Engine Plugs And Fittings; New 5P3413 Pipe Sealant (with Teflon) Available {0649,1100,1200}
1990/02/26 Cat Natural Gas Engine Oil (NGEO) Available For NACD Only {1318}
1990/02/26 Caterpillar Parts And Service Information Available On Dealer Computer Terminals (NACD Dealers Only) {0331,0336,0374,0375}
1990/02/19 Special Instruction Available With Replacement Information For 7C2662, 7C2664 Or 7C3507 VR3 Voltage Regulators{4467}
1990/02/19 Improvements Made To Water Pumps; New Groups/Parts Available For Certain Applications{1364,1361}
1990/02/12 Identification Of Turbocharger And Fuel System Components{1250,1700,1052}
1990/03/05 Changing Mounting Position Of 9F3099 And 302266 Magnetic Switches (Relays) May Extend Service Life{1426}
1990/03/05 New Fuel Inlet Fitting Eliminates Breakage; New Screen Used In Inlet Fitting{1250,1252,1261}
1990/03/05 Preventive Maintenance (PM) Kits Available For 3116 Truck Engines{7258,0645,1261,1318,1352,7542}
1990/03/05 2N4620 Rubber Drive Block Reinstated For Parts Service{3305}
1990/03/05 New Plug Used In Front Housing For Fuel Injection Control Group{1151,1298}
1990/03/05 New Basic Turbocharger Groups And Cartridge Groups With Improved Compressor Seals, Thrust Bearings, And Hollow Shaft For Reduced Heat Soak{1053,1077}
1990/03/05 New Piston Pin Retainer Used In 3600 Family Of Engines{1214}
1990/03/12 New Loupe (Magnifier) Available For Inspecting Failed Or Broken Parts{0777}
1990/03/12 New Hand-Held Microfiche Reader Available{0354,0374}
1990/03/12 New Rear Gear Group Has Spur Gears Instead Of Helical Gears For Longer Service Life{1204,1206,1212}
1990/03/12 Shorter Bolt Used To Hold Oil Pan Drain Cover{1302}
1990/03/12 Idle Shutdown Timer Used In Auxiliary Power Applications{1705,1706,4267}