1996/10/07 Caterpillar

Parts Manuals May List Air Conditioning Compressors Incorrectly {1802,1809,7320}

Usage:

All CATERPILLAR Products With Air Conditioning

Description of Change: Parts book listings for air conditioning compressors may be in error following conversion to R-134a air conditioning systems. Consequently, R-12 compressors may be replaced incorrectly into systems charged with R-134a refrigerant. R-12 compressors contain mineral oil and R-134a compressors contain PAG oil. When R-12 compressors are replaced into R-134a systems, R-134a refrigerant does not carry the mineral oil and the compressor is not lubricated. This will shorten compressor life and decrease compressor efficiency.

Adaptable To: All CATERPILLAR products listed in Chart 2 are equipped with air conditioning systems containing R-134a refrigerant. Compressors for these models should be replaced with the R-134a air conditioning compressors listed in Chart 1. Compressor replacements for all previous CATERPILLAR models with R-12 air conditioning systems should be made with R-12 compressors.

Caterpillar Information System:

1996/10/07 Effectivity Of Upgrades To Remanufactured Transmissions, Torque Converters And Wheel Assemblies {3001,4051}

1996/10/07 New Fuse Cap Available {1417}

1996/10/07 Special Instruction SEHS9983 Available For Installation And Adjustment Of Truck Body {7258}

1996/10/07 New Hoist Rotary Switch Assembly Used To Increase Reliability {1400}

1996/10/07 New Temperature Sensors Used To Monitor Oil Temperature In The Differential Housing {7601,3067}

1996/10/07 New Boot For Pilot Valve Group Improves Lever Movement For Hoist Control {5059,5136}

1996/10/07 New Material Used In Front Wheels To Increase Service Life {4201,4200,4208}

1996/10/07 Service Manual Module Revisions Available {0374}

1996/09/30 Improved Water Pump Groups Available{1361}

1996/09/30 New Governor Weight And Race Increase Durability{1264}

1996/09/30 An Improved O-Ring Seal And Proper Use Of Adapter Locks Reduces Oil Leaks{1252}

1996/09/30 Improved Sleeve Metering Fuel System (SMFS) 8.5 mm (.34 in) Fuel Pump Plunger Eliminates Plunger And Sleeve Scuffing{1251}

1996/10/14 Improved Alternator Adjustment Strap And Retention Hardware Used To Maintain Belt Tension {1405}

1996/10/14 New Poppet Valve Group Used In Lines Relief Valve Groups To Prevent Excessive Implement Drift {5117}

1996/10/14 Quieter Operating Check Valve Used In Tank Return Line {5067,5129}

1996/10/14 New Splined Boom Foot Pins Used For Improved Lubrication {6504}

1996/10/14 Stronger Baffle Tube Assembly For Hydraulic And Transmission Tank {5056}

1996/10/14 New Seals Available In Seal Kit For Steering Pump Groups And Hoist Pump Group To Improve Service Life {5073,5083,4306}

1996/10/14 Guide Assemblies From Body Mounting Group Are No Longer Necessary On The Truck Rails To Reduce Stresses In The Frame {7258}

1996/10/14 New Instrument Panel Lamps Used To Prevent Film Damage {7451}

1996/10/14 A New Hoist, Retarder, And Turn Signal Levers Now Used To Prevent Loosening {1430,3121}

1996/10/14 Brake Actuator Spring Now Serviced {4262}

1996/10/14 New Front Suspension Arms Now Used To Increase Service Life {7200}

1996/10/14 Improved O-Ring Seal On Turbocharger Drain Tubes {1052}