Compressor OIL Specifications

It is permissible to use oils other than the ATF shown above; such as Hydraulic oil. If they are used then they must have at least the following minimum properties:

•	ISO grade	32
•	CPS No.	255675
•	API Gravity	-

•Viscosity, Kinematic

	cst at 40 degrees C	33.6
	cst at 100 degrees C	5.5
•	Viscosity saybolt
	SUS at 100 degrees F	173
	SUS at 210 degrees F	45
•	Viscosity index	98
• Pour point deg. C(deg F)		-33(-27)
•	Flash point deg.C(deg.F)	204(399)

•Oxidation stability

•Hours to 2.0 mg KOH/g

acid no., ASTM D 943 >600

The advantage in using DEXRON® - III in the compressor is that it is good lubricant suitable to its application and it is readily available. There are other oils that may be used that have longer life. They are better able to stand the extreme operating conditions. Whether or not to use these oils is a decision that depends upon the operating conditions. Very frequent oil changes are necessary in extremely hot, dirty operating conditions and if the compressor is operating in a remote, difficult-to-reach service location then perhaps it would be better to use the DEXRON® - III because of availability and cost. If, however service is convenient and attentive so that the oil can be used for as long as it will provide good protection; then higher quality oils may be used that will extend the life of the compressor.

WARNING

BOSS DOES NOT RECOMMEND MIXING DIFFERENT TYPES OF OILS. WHEN CHANGING TO A DIFFERENT TYPE OIL, CLEAN COOLER, AIR/OIL RECEIVER AND LINES THOROUGHLY.

ADDING COMPRESSOR OIL

1.Level the compressor to assure oil level indicator will be accurate.

2.Remove any dirt around fill cap, which is located on or near the air/oil receiver and then remove the fill cap itself.

3.Inspect the fill cap for damage and cleanliness. Replace if necessary.

4.Proper oil can then be added until the oil level reaches halfway in the sight-level tube or the “bullseye”.

5.Replace full cap securely-never put cap on without tightening immediately.

6.Do not over fill the sump tank. This will cause oil to spray out of the blowdown valve and/or service valve.

P/N: 307271