Air Compressor Troubleshoot
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FTE Chapter Leader
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From: Central Mississippi
Air Compressor Troubleshoot
Craftsman 4hp/25 gallon horizontal tank, 20+ years, good shape well took care of in dry shop.
Yesterday after 30 minuets use, I manually shut it of for a couple minuets.
Flipped back on, browned out shop power for a couple seconds, then motor turns at about quarter speed, struggling hard.
Shut it down & gave it an hour. Flipped it back on & it ran fine.
No drag on the piston/rod. No excessive play on motor,drag,on armature.
Should I be looking at replacing brushes or start capacitors?
Thoughts, recommendations?
Thanx
Yesterday after 30 minuets use, I manually shut it of for a couple minuets.
Flipped back on, browned out shop power for a couple seconds, then motor turns at about quarter speed, struggling hard.
Shut it down & gave it an hour. Flipped it back on & it ran fine.
No drag on the piston/rod. No excessive play on motor,drag,on armature.
Should I be looking at replacing brushes or start capacitors?
Thoughts, recommendations?
Thanx
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Start and run caps are easily available, post up the ones you need and we can help.
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FTE Chapter Leader
Joined: May 2006
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From: Central Mississippi
Grainger has Dayton 2MDU5 that meets spec, but is too fat & $35 locally + would have to be strapped to the motor.
Original is 4-1/2 (4-3/8 seems common) x 1.42 (common what I've found is 1-13/16)
Haven't started trying to chase down the run, but should be more common, but I think it's probably the start.
The whole motor is odd-ball in that it seems most suppliers go from 3-1/2 to 5 hp (this is a 4) & 230vlt while this is an either/or 110/230 for the listed RPM.
I think the frame is a 6 inch (end case bolt across to end case bolt) or "56Z"
Sears Model for giggles
Thanks for your interest & time.
Original is 4-1/2 (4-3/8 seems common) x 1.42 (common what I've found is 1-13/16)
Haven't started trying to chase down the run, but should be more common, but I think it's probably the start.
The whole motor is odd-ball in that it seems most suppliers go from 3-1/2 to 5 hp (this is a 4) & 230vlt while this is an either/or 110/230 for the listed RPM.
I think the frame is a 6 inch (end case bolt across to end case bolt) or "56Z"
Sears Model for giggles
Thanks for your interest & time.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
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FTE Chapter Leader
Joined: May 2006
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From: Central Mississippi
I found a fairly skinny start on Amazon this afternoon that had specs mis-listed till you drilled down for a buck more.
Looks like Zip ties will be the way regardless.
Thanks for the run, looks same.
Looks like Zip ties will be the way regardless.
Thanks for the run, looks same.
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FTE Chapter Leader
Joined: May 2006
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From: Central Mississippi
Drilled down on line & saw start was proper size.
Both should be on the way.
Thanks, I was going cross-eyed & had given up on finding 100% correct item.
Will let y'all know how it works out.
Both should be on the way.
Thanks, I was going cross-eyed & had given up on finding 100% correct item.
Will let y'all know how it works out.
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FTE Chapter Leader
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From: Central Mississippi
I'll try & let you know. Box got here an hour ago. Will be heading out for a week sat & I could use air before trip.
When I flipped it on, if was running 200 RPM if that & the drag on the electrical system was unlike anything I'd ever seen since I built the joint.
When I flipped it on, if was running 200 RPM if that & the drag on the electrical system was unlike anything I'd ever seen since I built the joint.
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FTE Chapter Leader
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From: Central Mississippi
Don't know. Swapped out the start cap & ran from zero to auto stop @130.
Dumped the relief valve till the pressure dropped enough to kick on the motor 3 times, all without the shroud, so it should have gotten pretty warm.
Started fine, no drag, no brown out. When I get back, I'll be doing some grinding as to put some stress on it.
Till then, I call it good.
Thanx for your help Gashog.
Dumped the relief valve till the pressure dropped enough to kick on the motor 3 times, all without the shroud, so it should have gotten pretty warm.
Started fine, no drag, no brown out. When I get back, I'll be doing some grinding as to put some stress on it.
Till then, I call it good.
Thanx for your help Gashog.
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