WHEEL AS 6R4385 - Caterpillar

After the evacuation process is completed, connect charging hose (4) to refrigerant tank (11). Charging hose (4) is the same hose that was connected to the vacuum pump.
Open valve (10) that is located on top of refrigerant tank (11). Make sure that pressure valves (2) and (8) are closed. These two valves are located on manifold gauge set (7).
Purge any air that may remain in the lines by loosening charging hose (4) at the manifold gauge set. Tighten charging hose (4) after two to three seconds. Note: Use a heater blanket in order to warm the refrigerant tank if the tank is not full. If the ambient temperature is below 21 °C (70 °F) use a heater blanket to warm the tank.
Place refrigerant tank (11) on scale (12). Record the weight of the tank.
Open high-pressure valve (8) of manifold gauge set (7) and charge the system. Check the weight of the tank often. The weight will decrease as the refrigerant leaves the tank and the refrigerant enters the system. Refer to Specifications, "System Capacities for Refrigerant" for the proper amount of refrigerant. The necessary amount of refrigerant is the system capacity by weight. Charge the system with the necessary refrigerant. Close the high-pressure valve (8) of the manifold gauge set (7). Valve (10) that is located on top of refrigerant tank (11) must also be closed.
Restart the engine and run the engine at the rated rpm until the pressure stabilizes.
To ensure correct system operation, disconnect charging hose (4) and do a performance check. Refer to Service Manual, SENR5664, "Performance Checks for the Air Conditioning System" for the proper procedure. Charging the System from the Low Pressure Side
Personal injury or death can result when charging an air conditioning system with a liquid.The compressor will pump the refrigerant back into the charging cylinder with the possibility of rupturing (exploding) the cylinder.Do not operate the engine when charging with a liquid. Never charge liquid or gas through the discharge (high side of the system) with the engine running.Keep all other personnel either away from the machine or where they can be seen when working on the air conditioning system.
Note: If the refrigerant circuit contains no refrigerant, always evacuate the system before you charge the system. Also, be sure to charge the system by weight.
Illustration 2 g03718841
(1) Butterfly valve
(2) Low-pressure valve
(3) Low-pressure hose
(4) Charging hose
(5) Service valve (high-pressure side)
(6) Service valve (low-pressure side)
(7) Manifold gauge set
(8) High-pressure valve
(9) High-pressure hose
(10) Valve on top of refrigerant tank
(11) Refrigerant tank
(12) Scale This procedure is NOT the preferred procedure, but this procedure may be required under the following conditions:
The tank pressure is too low.
The ambient temperature is too low and a heater blanket is not available to warm the system.Use a scale in order to measure the amount of refrigerant that is charged. Do not use pressure in order to measure the amount of refrigerant that is charged.Refer to Illustration 2 for the following