Motor died on Craftsman compressor - need advice

by Neil
(Hickory NC)

OK, so my old Doerr motor died on this Craftsman compressor it has the old APB446 pump on it. I have been looking at motors and i found a leeson 116523 motor for $200 buck to replace it.


I have questions.

I get this is probably not a true 5hp compressor since it is drawing 15 amps. but the Doerr was only 15 amp as well. i cannot find any specs on this pump to find out if i got a bigger motor would the pump take it?

Any help on understanding how to find this out would be great!

here is the link to the leeson
https://www.ebay.com/i/163038486357?chn=ps

Comments for Motor died on Craftsman compressor - need advice

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Jun 26, 2018
Craftsman compressor remarks
by: Doug in s.d.ca

I have just the Harbor Freight brand oil in it now.. what can I put in it the has viscosity?
>>synthetic 30w or "dino" 30w if you can find it. non-detergent.

The HF pump I am not sure would keep up since I am needing to sandblast.
>>They are both rated about 15 cfm @ 90 psi w/5 hp. Do you know the needs of your blast equipment?

Can you do a visual on the rings to see if they are bad? If so how?
>>Irregular wear on rings and scoring on cylinder walls.

I am not seeing much oil in the air lines but I am seeing oily residue in the pump air filter?
>>On the inside of filter? Have you cleaned it up to see if it comes back?

Thanks for the help
>>sure. Keep us posted...

Jun 24, 2018
Craftsman
by: Anonymous

Yea I found LP ring set for 50 bucks HP they want 140 wow...
I have just the Harbor Freight brand oil in it now.. what can I put in it the has viscosity?

The HF pump I am not sure would keep up since I am needing to sandblast.

Can you do a visual on the rings to see if they are bad? If so how?
I am not seeing much oil in the air lines but I am seeing oily residue in the pump air filter?

Thanks for the help

Jun 22, 2018
Gaskets, etc. for Craftsman air compressor
by: Doug in s.d.ca

OK. Lots of questions, and I don't know your needs, wants, and how much loose change you have, so let me just throw out some thoughts...

You can probably make gaskets, although some may be tricky. Have you found rings for it?

Regarding oil, how much oil are we talking about? Is it tolerable (maybe with some extra filtering) for whatever you use it for? Have you tried higher viscosity?

Given the $600 for a new two stage pump, do you need that? Maybe the $170, 145psi, 5HP from HFT would do ya? I know they don't have good QC, but you can work it hard at first, and if it breaks, they have a pretty good return policy...



Jun 19, 2018
Pump issues
by: Neil Cunningham

Thanks for the info Doug.

I cannot connect the LP to the tank the fill tube won't fit. Wish I knew how to make my own.. any links to help?

Also finding oil in the air filter housing. So I guess oil is getting by the rings. Since this is building pressure the valves should be good right?
Is there a way to tell how bad the rings are buy looking at them?

Also do you think there is any problem making the lower oil gasket and reusing the head gasket since the gasket kit is over 100 bucks.

Do you think this pump is worth fixing .. i read lots of people hate this pump but it was on a Craftsman unit.

Thank you for the help..

Jun 19, 2018
The pump is ABP446
by: Anonymous

Thanks Doug..
I am also seeing oil in the air filter. Not sure I can run the LP side directly to tank the line won't fit.

That said since it's building pressure the valves appear to be good does this sound like rings? Is there a way to look at the rings and check wear. I can buy a hone for 25 bucks at harbor freight but I have never honed a cylinder. How do I know how much I can remove how do I know how much clearance I have to work with.

And I guess the biggest question is that pump worth it? I hear they are crap but it was on a Craftsman unit so they are usually good but a new pump is very high.. I appreciate the info and advice.

Jun 18, 2018
Craftsman compressor blowby
by: Doug in s.d.ca

I suppose you could disconnect the intercooler and run the LP direct to tank - if no air in crank case then that'd indicate the HP side, etc.

Or, just try a higher viscosity oil.

Most anything you'd do with a piston engine applies to piston compressors, including honing.

Keep us posted...

Jun 18, 2018
Thanks Doug
by: Anonymous

Thanks for the info Doug i bought the leeson motor and it seems to be working great. but i did notice some air coming out the oil filler area.

i been reading and it says that could be rings and seals. would there be anyway to tell if HP or LP side. the ring kit are 50 bucks each piston.

i guess the real question is do just run this until it goes and replace the pump? its making 170 PSI right now . i think i could rebuild it i have done a harbor freight compressor not sure how much different this would be? would i need to hone this cylinder?

Jun 15, 2018
If it's not one thing it's another...
by: Doug in s.d.ca

That's a 3-5 HP pump, so I wouldn't try to push it.

If the RPM and pulley work, I'd just drop it in.

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