SLEEVE 3121143 - Caterpillar

Personal injury can result from contact with refrigerant.Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.Personal injury or death can result from inhaling refrigerant through a lit cigarette.Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.
Illustration 1 g00665400
The in-line dryer is located behind the lower engine access door on the left side of the machine. The in-line dryer contains the orifice tube, a desiccant that dries the liquid refrigerant, and a tracer dye wafer.
Illustration 2 g00676891
(1) Quick disconnect fitting for the "OUTLET" hose (2) Orifice tube assembly (3) Desiccant (4) tracer dye wafer (5) Quick disconnect fitting for the "INLET" hose
Stop the engine. Allow the air conditioning system to remain inactive for five minutes in order to equalize the pressure.
Disconnect the "INLET" hose from quick disconnect fitting (5) on the old dryer.
Connect the "INLET" hose to quick disconnect fitting (5) on the new dryer.
Start the engine and operate the air conditioning system for one minute in order to evacuate the refrigerant from the used dryer.
With the air conditioning system in operation, disconnect the "OUTLET" hose from quick disconnect fitting (1) on the old dryer.
Stop the engine. The air conditioning system must be idle for five minutes in order to equalize the pressure.
Connect the "OUTLET" hose that was disconnected in Step 5 to quick disconnect fitting (1) on the new dryer.Also refer to the replacement procedure in the Service Manual Module, SENR-5664, "Air Conditioning and Heating". Compliance with this procedure will provide the following benefits:
The refrigerant compressor oil will not escape from the system.
The amount of moisture that enters the system will be reduced.
A sludge deposit will not form.
It will not be necessary to top off the system with compressor oil or refrigerant.Note: The R-134a refrigerant dryer should be replaced annually. Extremely humid operating conditions may require more frequent replacement of the dryer. The dryer should also be replaced if the air conditioning system has been leaking or if the system has been opened for service repair.