Improved Air Conditioner Thermostat Switches Have Tin-Plated Internal Parts{7320}
Usage:
All Models With Air Conditioners
Description of Change: The 9P3498 and 7T9277 Thermostat Switch Assemblies for air conditioners have been improved by using tin-plated parts. This minimizes the possibility of the internal parts failing due to stress corrosion.
Adaptable To: The improved switches can be used as direct replacements for the earlier switches. Part numbers did not change, but the improved switches can be identified by the light gray color on the terminals. Earlier switches have copper-colored terminals.
The improved switches are also marked with the following change numbers:
Caterpillar Information System:
1988/12/05 Hydraulic Pressure Settings For Backhoe Loaders{5050,5450}
1988/12/05 Improved Coupler Pin Helps Prevent Cylinder Rod Bending{6129}
1988/12/05 New Air Tank Drain Valve Used{4250,4272}
1988/11/28 More Charts And Decals Available For Lubrication And Maintenance Intervals {0374,0375,7500}
1988/11/28 Stronger, Longer Ring Gear Retainers For Final Drives {4054,4084}
1988/11/28 Improved Wheel And Longer Bolts Provide Better Retention Of Front Brake Disc {4255,4201}
1988/11/28 New Mounting Pin Assemblies For Blade Tip Cylinder {5106}
1988/11/21 One-Piece Tappet (Follower) Used In 11 mm (Type 2) Fuel Injectors{1290}
1988/11/21 New Oil Seal For Water Pumps Has Hydrodynamic Grooves{1361,1389}
1988/11/21 Improved Pressure Gauge Sender Used{7450,7485}
1988/11/21 Be Sure To Follow Cooling System Recommendations{1350}
1988/11/21 Fabric Seat And Back Cushions Available For Parts Service{7307,7312}
1988/12/05 Operation Of Feeder Sensor Control{8216}
1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}
1988/12/12 New Operator Monitor Group Used{7490}
1988/12/12 Parts Needed If Air Compressor Tubes Replaced{4257,1803}
1988/12/12 New Switch For Back-Up Alarm{7406}
1988/12/12 New Solenoid Valve For Rotor Lift System{8245}
1988/12/12 New Mounting Bolts Used In Aftercooler Housings{1063,1058}
1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}
1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}
1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}
1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}
1988/12/19 Cold Weather Readiness Checks {1456,1250}