FILTER GP-OIL 4N2281 - Caterpillar

Personal injury can result from contact with refrigerant.This system is under pressure at all times, engine running or not. Heat should never be applied to a charged system. 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.Before any checks of the air conditioning and heating system are made, move the machine to a smooth horizontal surface. Lower all implements to the ground. Make sure the transmission is in neutral or park and that the parking brake is engaged. Keep all other personnel either away from the machine or where they can be seen.
Illustration 1 g00301280
(1) Hose (high pressure) (2) Hose (low pressure) (3) Blue low pressure hose (4) Red high pressure hose (5) Low pressure valve (6) High pressure valve (7) Manifold gauge set (8) Yellow charging hose (9) Vacuum pumpPerform this procedure to extract all air and moisture from the system. The recovery of refrigerant from the system is necessary if a component is replaced or repaired. After repairs have been finished, perform this procedure to extract all air and moisture. Perform this procedure if the system has lost the charge of refrigerant after a long period of time. A complete charge must never be given to a system without first performing this procedure. Refer to Testing and Adjusting, "Leak Test", Testing and Adjusting, "Refrigerant System - Recovery" and Testing and Adjusting, "Refrigerant Compressor Oil - Check" before evacuating the system.Install a new accumulator if the system has been exposed to the air or moisture. If an accumulator is left open for more than 1/2 hour the accumulator can be exposed to air or moisture. Corrosive by-products can be produced when moisture combines with metals in the refrigeration system. The by-products include oxides, iron hydroxide, and aluminum hydroxide. Moisture can freeze the expansion valve and moisture can clog the evaporator. If there is water in the system the water must be removed. The water must be removed by pulling a vacuum and boiling the water. Refer to table 1.
Table 1
Boiling Point Of Water Under Vacuum    
Temperature Of Work Area     Vacuum That Is Required To Boil Water In The System    
38 °C (100 °F)    
948 m bar (28.0 in Hg)    
32 °C (90 °F)    
965 m bar (28.5 in Hg)    
27 °C (80 °F)    
975 m bar (28.8 in Hg)    
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