Handling Of Compressor Oil - Komatsu PC88MR-10 Shop Manual

Handling of compressor oil

Check compressor oil amount
Although compressor oil (ND OIL8) differs from engine oil in that it does not need frequent checking or
filling, the following types of problem can occur if the amount in the system is excessive or too insufficient.
Condition
Insufficient oil
Excess oil
Accordingly, compressor oil (ND OIL8) must be filled to the specified level, similarly to refrigerant.
Filling of compressor oil
a Refrigerant may be dangerous if not handled with care. Discharging refrigerant into the atmosphere is
harmful to the environment. Before disconnecting air conditioner hoses, refer to "Precautions for
disconnecting and connecting refrigerant piping" and ask a qualified person for the work.
a If oil for use with CFC 12 (R 12) is used, lubrication trouble will occur and the compressor may be broken
or seized. Be sure to use the oil (ND OIL8) for R134a.
a Oil (ND OIL8) for use with R134a is extremely hygroscopic, and therefore, put the cap the oil container
immediately after use to limit contact with air.
Avoid damp places for storage and store the oil can in a ventilated place.
a Do not allow oil for use with R134a to come into contact with acrylic plastic or polystyrene surfaces (except
a baked finish) as it may dissolve these plastics.
If any of the following is true, check the oil level and add oil as necessary.
Refrigerant is lost in a short time due to a large leakage.
The compressor had a problem and was replaced.
(Refer to "Replacement of compressor" in this section.)
Component(s) of the refrigeration cycle such as air conditioner unit, condenser, modulator, or refrigerant
pipings has been changed.
Quantity of oil to be added when cycle part is replaced
Air conditioner unit, evaporator
Condenser
Receiver drier
Hose (between compressor and cab)
Hose (between compressor and condenser)
Hose (between cab and receiver drier)
Replacement of compressor
In case of compressor seizure or breakage
Metal chips will circulate through the air conditioner circuit and contaminate the compressor oil extremely.
Flush the refrigerant circuit and replace the compressor and condenser (modulator).
PC88MR-10
(PC88MR-K594-212-K-00-A)
Lubrication trouble and seizure of compressor
Lowered cooling performance
(Excess oil stick to parts and lower heat exchange performance)
Air conditioner part

Handling of compressor oil

Content
Quantity to be added
Approx. 40 cc
Approx. 40 cc
Approx. 20 cc
Approx. 25 cc
Approx. 5 cc
Approx. 10 cc
80 Appendix
80-83