Air Conditioning and Heating R-12 All Caterpillar Machines Caterpillar

Illustration 1	g00382493
Top View of Receiver-Dryer (1) Inlet (2) Outlet (3) Quick Disconnect Fittings

The refrigerant that is in the system must be recovered if the receiver-dryer does not have air conditioner quick disconnects (3). Refer to the Service Manual, SENR3334, "Refrigerant Recovery" section in Testing and Adjusting before you remove the receiver-dryer. If the receiver-dryer has air conditioner quick disconnects (3) use the procedure that follows.

Refer to Safety Requirements before service is performed on the air conditioning system.

1. Stop the engine for five minutes. This allows the air conditioning system to equalize the pressure.

2. Disconnect the inlet hose (1) from the old receiver-dryer at the air conditioner quick disconnects.

3. Connect the hose that was disconnected in Step 2 to the inlet on the new receiver-dryer.

4. Disconnect the electrical connections on the old receiver-dryer. Connect the electrical connections to the new receiver-dryer.

5. Add 30 mL (1 fl oz) of refrigerant oil to the system.

   Note: Do not add refrigerant oil if the compressor was changed also.

6. Start the engine. Operate the air conditioning system for one minute.

7. With the air conditioning system in operation, disconnect the outlet hose (2) from the old receiver-dryer. Disconnect the old receiver-dryer at the air conditioner quick disconnects.

8. Stop the engine for five minutes. This allows the air conditioning system to equalize pressure.

9. Connect the outlet hose (2) that was disconnected in step 6 to the new receiver-dryer.