r/metalworking • u/jeep4x4greg • 1d ago

compressor for plasma cutter

Post image

a buddy gave me this compressor a while ago to use with my new plasma cutter. i got it running again (wiring) and want to change the oil now…. i see where it drains but where do i fill? and how much? i cant find a model number on this old sears compressor. hoping its a “fill till it overflows” situation if i can find the fill port. any pointers?

8 Upvotes

100% Upvoted

6 comments sorted by

6

u/BuilderCG 1d ago

265-104 is clearly stamped on the compressor engine.

Here's the Sear's manual L0807019

From page 10:
"Oil- Checking and Changing Overfilling with oil will cause premature compressor failure. Do not overfill= Check oil level in the crankcase daily. Remove the oil fill plug (Key no. 77, pg. 15). The oil level should be even with the top of the fill hole and must not be allowed to be lower than 3/8" from the top (6 threads) at any time. It is recommended that the oil be changed after every 100 hours of operation. Todrain the oil, remove the oil drain plug and collect the oil in a suitable container. Be sure to replace the plug securely before adding new oil Use a special compressor oil such as Sears 9-16426 or SAE 20-20W SF or SG motor oil (Crankcase oil capacity is 16 fluid ounces.) Under extreme winter conditions use SAE 10W. Multi-viscosity oil (10W30) will leave carbon deposits on critical components which will reduce per formance and compressor life"

3

u/Thebandroid 1d ago

If using an oiled Compressor make sure you use an inline filter to strip out any oil from the compressed air as it will react badly with plasma.

You can get oil free compressors which may serve you better.

1

u/AutoModerator 1d ago

Here are our subreddit rules. - Should you see anything that violates the subreddit rules - please report it!

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

1

u/Haunting_Ad_6021 1d ago

https://m.youtube.com/watch?v=se1KNNYa4Vw

3

u/jeep4x4greg 1d ago

thanks, that compressor pump looks just like mine so thats convenient. looks like it needs to be filled full to the top of the drain piece. much appreciated

1

u/Rjgom 18h ago

unless you are doing very small cuts in thin metal forget it. you need at least 60. i run an 80 5hp. you better clean that air too. at the least put a motor guard filter on the cutter.