SEAL 3J0371 - Caterpillar

Table 7
Compressor    
Operation     Check if OK    
Check the cleanliness of the wire connections for the compressor and make sure that the connections are free of damage.        
Make sure that the dust caps are securely installed on the service ports.        
Make sure that the clutch engages when the A/C switch is on and the thermostat is set to maximum cooling.        
Table 8
Compressor Drive Belt    
Operation     Check if OK    
Check for wear and damage on the compressor drive belt.        
Make sure that the auto tension pulleys are functioning correctly.        
Make sure that the drive belt is aligned within 1/3 of a degree.        
Table 9
Hoses and Connections    
Operation     Check if OK    
Check for wear and damage on the refrigerant lines        
Check for leaks on the refrigerant lines        
Check for wear and damage on the heater lines        
Check for leaks on the heater lines        
Make sure that the heater valves are open for use in the winter.        
Table 10
Performance    
Operation     Check if OK    
Make sure that a performance check on the air conditioning indicates a system that is functioning properly.
Refer to Testing and Adjusting, "Performance Checks for the Air Conditioning System".        
Make sure that a performance check on the heater system indicates that the system is properly functioning.
Refer to Testing and Adjusting, "Performance Checks for the Air Conditioning System".        Air Filters-Clean
The cab air filters are designed to provide clean air to the evaporator and the heater coils. The cab air filters are also designed to keep the cab pressurized. If the filters are not properly maintained, the coils will be coated with dirt. Dirty coils will result in loss of heating and cooling. Dirty coils could also result in failure of the compressor. Refer to Testing and Adjusting, "Coil Cleaning".
Illustration 1 g01517100
Cab air filters should be inspected regularly. Any inspection variance depends on the environmental conditions. Fresh air filters should be checked after every shift (8 to 10 hours). Fresh air filters should be changed after every week (40 to 50 hours). Recirculation filters should be checked after every week (40 to 50 hours). Recirculation filters should be changed after every month (160 to 200 hours). Inspect the filter for holes. Look through the filter toward a bright light. Check for damaged gaskets or dented metal parts. Do not use damaged filters. For extreme dust conditions, the filters should be inspected daily, and the filters should be cleaned whenever is necessary.
Illustration 2 g01517101
Remove loose dirt with compressed air. Do not exceed 690 kPa (100 psi) from an air nozzle that is 3.18 mm (0.125 inch)diameter. Keep the air nozzle at least 51 mm (2 inch) from the filter. The filters that are made of foam can be blown out