CABLE AS 3826862 - Caterpillar

Identifying The System
Examine the charging ports. If one port is smaller than the other port,the air conditioning system contains R-134a refrigerant.
Illustration 1 g00291316
(1) Block fitting at compressor with R-134a charging ports If the machine has R-134a charging ports, a tag should identify the type of compressor oil that is used. The tag can be located inside the cab. The tag may also be located near the compressor. The tag will also display the amount of refrigerant in the system. If the machine was delivered from the factory with R-134a refrigerant, the tag will display PAG (Poly Alkaline Glycol). It will be necessary to determine if the system has an orifice tube or an expansion valve. If the system has a receiver-dryer (2), the system is an expansion valve system. The system is an orifice tube system if an accumulator (3) is present.
Illustration 2 g00316144
(2) Receiver-dryer for expansion valve system.
Illustration 3 g00319495
(3) Accumulator for an orifice tube system.Glossary of Terms
Accumulator - The accumulator is the component of an orifice tube in the air conditioning system that separates liquid refrigerants from the circuit. The accumulator is used to store a small amount of liquid refrigerant. The accumulator may also contain a desiccant which will remove moisture from the system. Ambient air - outside airCharge - The charge is a predetermined amount of refrigerant that is put into the air conditioning system by weight.Compressor - The compressor is a component in the system that increases the pressure of the refrigerant in the system by pumping.Condenser - The condenser is a component in the system that changes the refrigerant from gas to a liquid.Contaminants - dirt, water and airDesiccant - The desiccant is part of the receiver or the accumulator that removes the moisture from the air conditioning system. Detecting - Detecting is finding the source of the problem in the system.Diaphragm - The diaphragm is a rubber-like material. The diaphragm divides the upper chamber and the lower chamber in the thermostatic expansion valve.Discharge - The discharge is the removal of some of the refrigerant or the removal of all the refrigerant from the air conditioning system.Discharge side - The discharge side is the outlet from the compressor to the condenser coil.Evacuating - Evacuating is the removal of air and moisture from the air conditioning system. Evaporation - Evaporation is the process of changing a liquid to a vapor.Evaporator - The evaporator is the component in the air conditioning system that changes the refrigerant from a liquid to a gas by the addition of heat. Expansion Valve - The expansion valve is a component in the air conditioning system that regulates the flow of liquid refrigerants into the evaporator.Fluid - Fluid is a liquid or a gas.Flush - To remove foreign material and oil from the system, you must flush the system with fluid that is approved. The fluid must be approved by the S.A.E. and I.S.O. standards.Freeze - Freezing can cause a liquid to become a solid.Gas - gas is a vapor which contains