how to change oil in sears 25 gallon air compressor
by A S
(Kitchener,ON. Canada)
Sears 25 gallon air compressor Model : 919.721820 purchased it used and just for the safe side would like to replace the oil, or if I can get access to service diagram that can explain which area to drain and pour new oil in it. Please help.
Bill answers...
Hello Amir:
If you look at or near the top of the compressor head, you should find a port with a screwed in plug. That plug might have a slot for a screwdriver, but more likely either has a square head or hex head onto which you can place a wrench. Others have a hand-knob that you can unscrew, leaving a hole into which you can pour oil.
Make sure it's clean, compressor oil.
Look around the bottom of the compressor head, and you will find another plugged port, similar to what's noted above, from which you can drain the oil from the compressor head.
Before opening that plug, consider what you are going to do with the waste oil both in terms of avoiding a mess when it pours out, and disposal of the waste oil, which is a hazardous waste, I believe.
Drain the oil, replace that plug, and fill with clean fresh compressor oil.
Careful not to overfill as this will cause service issues in time.
Sear compressors are usually Craftsman brand. So, if you Google "Craftsman" you should find a source (I did)for getting a manual for your compressor.
Cheers,
Bill
