Dayton Speedaire Model 3Z419 - what oil and how much?

I'm trying to find the oil capacity and what type of oil to use for this unit.


Bill says...

I don't have the specs for this model, and you don't indicate the HP but I'm guessing it's a fairly small compressor?

It will either have a sight glass or a dipstick to measure oil fill levels.

I suspect it will take less than a quart to fill, and you do want to be careful as you do, that you don't overfill, as that brings with it its own series of problems.

If you buy either compressor rated lubricating oil at the store, or a 30 W (not 5w-30 or 10w-30, but just 30 weight) none detergent oil, you should be OK.

Why not contact Grainger too and get the specialists recommendation? They own the Speedaire brand.



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3Z323 1 Speedaire bogs down

by Papageorgiou
(Rockville, MD)

I have a SPEEDAIR 3Z323 compressor That I bought from Graiger about 35 yrs ago. Great service through the years. Yesterday, after removing the DAYTON capacitor a/c motor and the cast iron pump (in units no disassembly) for repairing a pin hole in the side of the tank, I re-istalled the motor and pump.

The compressor started working fine for about 35 seconds and pressure was indicating 40psi when the pump started slowing down sounding stressed and tight and the motor (DAYTON Capacitor A/C Compressor, V 115/230, A 17.8/8.9) made some screetching dry noise in the area of the axle (point of belt turning) although the belt tension was proper. I turned the power OFF immediately.

After removing the belt, I could spin the motor freely by hand. With the belt OFF, I turned the power ON and the motor was spinning on high rps without any noise. Turning the power OFF again the motor spinning slowly went down and came to a stop without any stress or noise. Oil was changed about 2 weeks ago and level is to top. I appreciate your input. Thanks. George

Hi George...

I hope you are really good with a welder. It is not normally a good idea to try and repair a leaking compressor tank. The pinhole indicates that there is internal rust damage to the tank wall, and you may have the potential for a catastrophic failure along the way. I would replace the tank myself.

Now, as to the motor bogging down now, when it did not before, if nothing else on the compressor or the power supply has changed, I suspect that the check valve from the pump head into the tank has been compromised. That possibly happened when you were moving the tank around to fix it, and lots of tank crud got into the check valve and maybe prevents it from opening properly.

That's my first guess, Papageorgiou. Maybe check that out and then post if that was the problem or not as a comment here?



Comments for 3Z323 1 Speedaire bogs down

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Aug 11, 2012
Motor bogs down
by: George

Hi Bill,
Thank you for your suggestion regarding possible air pressure valve failure. I was suspecting that but I had taken no action as to exploring it. After your suggestion, I will definitely check it out and post the result. Also I will look for another tank. Thanks,
No problem, hope I helped.


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