New Spring Used In Belt Tightener And/Or Fan Drive Groups{1358,1359}
Usage:
All Vehicular Engines That Use A 1S6211 Spring In The Belt Tightener Or Fan Drive Groups
Description of Change: A new three-piece 7N5959 Spring is used as a replacement for the one-piece 1S6211 Spring in the belt tightener on fan drive groups on vehicular engines. The new three-piece spring has a different design in the shape of the hooks at each end. The hooks are now separate pieces assembled into each end of the spring. The former hooks had ends with a small radius. The design of the former springs caused stress in the spring wire where it was bent to make the hook. This caused some hooks to break. The new design spring will give longer service life in this application.
Adaptable As: Direct replacement.
Caterpillar Information System:
1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}
1978/01/30 Electric Fuel Pressure Gauge Now Used{7456}
1978/01/30 Rectifiers And Fuses Added To Transmission Control Wiring Increase Switch Service Life{1408,3168,3172,3173,3174}
1978/01/30 Improved Electrical Wiring Has A Separate Fuse For Each Circuit{1408}
1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1978/01/30 Additional Parts Needed To Install 54 Winch On Tractors Equipped With Steel Fuel Lines On The Fuel Tank{5163}
1978/01/23 Stronger Guard Assemblies For Scraper Bowl{6201}
1978/01/23 New Torque Converter Has Several Improvements{3101}
1978/01/23 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups{1264,1278,1286}
1978/01/23 Rear Counterweights Are Now Made Of Steel{7056}
1978/01/23 Changes Made To Scraper Lubrication Films{7557,6229,6230,6239}
1978/01/16 Stronger Link Assembly For Bucket Control Group; Longer Grease Fittings Make Lubrication Easier{6107}
1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}
1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}
1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}
1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}
1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}
1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}
1978/02/06 Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}
1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}
1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}
1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}
1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}
1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}