How to tell oil level in a Speedaire Model 35WC73 ?

by Trevor B
(Zeeland MI )

Is it possible this could have came from our dealer with oil in it already, the manual says to add oil before use, we did so.

After running after a hr excess oil comes from breather cap.

The oil level gauge is full to the top with air bubble, no change when draining.

Wondered if needed to be completely cooled down or running to tell level?

Comments for How to tell oil level in a Speedaire Model 35WC73 ?

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Feb 02, 2019
by: Doug in

BTW, you used the right oil? Compressor oil or Mobil 1 or similar?

If you used motor oil, it may be foaming and making the sight glass less than useful.

Feb 02, 2019
by: Doug in

The oil should be in the middle of the sight glass.

Usually, there's not a big difference whether running or not.

Two things:

Is it running in the right direction?

Did you put oil into the oil fill port, or the breather cap? Breather cap is wrong.

If you didn't get one(!?), download the manual from Grainger.

OPERATING INSTRUCTIONS IMPORTANT: Check motor rotation before operating the compressor.

Recommended Break-In Period: The compressor should be run continuously for one hour to allow proper seating of the piston rings.
1. Open drain cock completely and run the compressor for 60 minutes.
2. Turn off the compressor and close drain cock. The compressor is now ready for use.

Crankcase Breather: During severe operating conditions or initial start-up, some oil may accumulate at the crankcase breather opening. This is normal and will diminish as the pump accumulates run time and the piston rings become fully seated.


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