1977/09/12 Caterpillar

New Refrigerant Compressors And Kits With Improved Seals; Conversion Of Earlier Units{7320}

Usage:

All Models Equipped with Air Conditioners

Description of Change: In an earlier change, a new front dust cover, front seal and pulley bearing were used to keep out dirt that enters (gets into) the pulley from the front. Now, a design change is made to keep out dirt that enters the pulley from the rear (compressor end) of the drive assembly. The new design of the pulley and seals gives better seal efficiency, and more completely seals the compressor end of the drive assembly.

Adaptable As: Each of the new basic compressor groups is a direct replacement for the former group. A new rebuild kit is available, and can be used for conversion of either former compressor group to a new group. This kit will be sent as a parts service replacement for any of the former repair kits, and is separate from the new repair kits used for the new compressor groups. Special Instruction Form SMHS7127 is sent with the rebuild kit as shown in the parts chart for conversion of former compressors.

Caterpillar Information System:

1977/09/12 The Discrepancy Card Has Changed{0374}

1977/09/05 Field Repair Of Cooler Cores Made Of Aluminium{1063,1374,1375}

1977/09/05 Check For Extra Holes In Crankshaft Flange If Oil Leaks From Between The Flywheel And Crankshaft Flange{1156,1202}

1977/09/05 Installation Procedure For Crankshaft Wear Sleeves Changed{1202,1160,1161}

1977/08/29 More Bolts Hold Flywheel Housing Group{1157,1162}

1977/08/29 Anti-Corrosion And Break-In Coatings{0374,3256}

1977/08/29 Engine Valve Springs Are Now Made Of Stronger Steel{1108}

1977/08/29 New Tube Assemblies For Turbocharger Oil Lines; New Base Assemblies For Oil Filters{1052,1306,1307}

1977/08/29 Improved Cylinder Block With Spacer Plates Used With Improved Cylinder Heads And Cylinder Head Gaskets{1101,1201,1221}

1977/08/29 New Clutch Groups Used In Front Power Take-Offs; Service Kits Available{3055}

1977/08/22 Installation Of Generator Sets On Rigid Bases{4450}

1977/08/22 Problems With Oil Or Fuel Filters{1261,1318}

1977/09/19 Changes To The Injection Pump And The Fuel Setting{1251,1257}

1977/09/19 Use Viscous (Fluid) Type Crankshaft Vibration Damper In Place Of Rubber Type Damper{1205}

1977/09/19 Stronger Piston Is Used; Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}

1977/09/26 Use Correct Contact Point With Dial Indicator To Be Sure Of The Accuracy Of The Measurements Of Fuel Setting And Fuel Ratio Control Setting On Sleeve Metering Fuel Systems{0653,1250}

1977/09/26 Stronger Fan Drive Pulley Prevents Cracks During Assembly; Torque On Pulley Bolts Changed{1359}

1977/09/26 New Special Instruction Gives General Information On The Use Of The 5P6590 Wiring Harness Tester For Electrical System Testing{0650,1400}

1977/10/03 Change Is Made to Support Beam For Front Of Engine{0643}

1977/10/03 Turbocharger Heat Shields Are Stronger{1073}

1977/10/03 Washer Removed From Variable Timing Unit{1206,1272}

1977/10/03 Do Not Use Plastic Tubing With Brass Couplings As A Fuel Supply Line{1274}

1977/10/10 Be Sure To Drain Oil From The BrakeSaver At Every Lubricating Oil Change Period{1318,1155}

1977/10/10 Fuel Transfer Pump Shaft With Chromium Plate{1256}