STRAINER 0988091 - Caterpillar

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 3 g00655179
(1) Low pressure valve (2) High pressure valve (3) Low pressure hose (4) High pressure hose (5) Service valve (low pressure side) (6) Charging hose (8) Service valve (high pressure side) (9) Manifold gauge set (10) Valve on top of refrigerant tank (11) Refrigerant tank (12) Connection to manifold of charging hose (18) Scale (E) Vapor (F) LiquidThis 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 3 for the following steps.
Connect