Air compressor: rebuild or replace pump?
I have an upright Craftsman air compressor that doesn't build pressure as quickly as it used to. Thought it was the filter but swapping in a new one didn't change the recovery time. I used to be able to run my whiz tool (die grinder) or my sandblaster and it would run, build up pressure and shut off. Now the sandblaster and the whiz tool lose power and the compressor runs constantly and doesn't catch up.
I can get a complete brand new pump for about $190 or a ring and seal kit for about $90. It just doesn't seem right to spend the extra 100 bucks but considering I would get the whole pump............. Paul |
Re: Air compressor: rebuild or replace pump?
picture of compressor, please
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Re: Air compressor: rebuild or replace pump?
Model number?
I'd say why not rebuild since chances are the new pump is from Asia. My opinion after 4 compressors is if it isn't an 80 gallon Quincy or Saylor-Beall, why bother. |
Re: Air compressor: rebuild or replace pump?
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Paul |
Re: Air compressor: rebuild or replace pump?
Its what i wanted to see. Looks to be a aluminum head chinese pump
can get a replacement at harbor freight http://www.harborfreight.com/145-psi...ump-67697.html A quality replacement pump may cost a little more http://www.ebay.com/itm/Kellogg-Amer...4AAOSwoydWp9pR |
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Wow that's quite a difference! Thanks Warren! |
Re: Air compressor: rebuild or replace pump?
i have a 18 yr old craftsman 10 cfm @90psi with a 7 hp motor that i never turn off unless i go on vacation
my neighbor has the same compressor as you have with the 3.7 hp motor and about the same age it has the same problem where it won't build pressure i think craftsman just used a cheap pump on them i'd buy a new pump before wasting $90 on rebuilding a cheap pump either way you'll still have a cheap pump :D |
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Think I'll spring for the new Harbor Fright pump that Warren provided a link for. At work we have a couple nice older IR compressors that run what's left of our pneumatic thermostat system. Next summer they are scheduled to be removed and the system upgraded to electric controls. I'll pick one of them up and rebuild it. The HF pump should last a year! Thanks again guys Paul |
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Hey Warren Looks like I won't be able to score the one from work next year after all. They took the conversion out of the budget. I did a search on Ebay for 3hp pumps and came up with this one. http://www.ebay.com/itm/EMAX-3-HP-Si...8AAOSwSclXK6WM Is this one better than the Harbor Freight pump? Paul |
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Re: Air compressor: rebuild or replace pump?
Something like this:
http://www.ebay.com/itm/Champion-VP1...gAAOSwOdpX1wpK or this http://www.ebay.com/itm/Schulz-Singl...0AAOSwx~JWFA~V |
Re: Air compressor: rebuild or replace pump?
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Paul |
Re: Air compressor: rebuild or replace pump?
They seem decent enough. I linked to more widely known quality compressors.
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Thanks again Warren |
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Sorry for being a pain. I've been comparing the photos in both of your links and I believe they are the same brand of pump. The Champion pump shows a picture with a Shultz data plate! Paul |
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Made an offer on the Champion pump and will get it for $200 shipped. Thanks again. Paul |
Re: Air compressor: rebuild or replace pump?
Awesome!! should last for many years!!
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Re: Air compressor: rebuild or replace pump?
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The new pump came in and now I've got another problem. The original chinese pump has two things going into the pump head. One is the the supply to the tank and the other goes into the pressure shut off. The new pump doesn't have the tapped fitting for the pressure switch line. Any ideas on how to plumb this?
Thanks Paul |
Re: Air compressor: rebuild or replace pump?
My champion pumps at work the pressure cut off is pumbled to the tank
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Re: Air compressor: rebuild or replace pump?
Thanks David. I'm not sure the tank wall is going to be thick enough to drill and tap though. I'll have to look and see if there is a good location to do it.
Paul |
Re: Air compressor: rebuild or replace pump?
Why not just use a T fitting at the tank and read PSI off the pressure line from the compressor?????
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Re: Air compressor: rebuild or replace pump?
yea you really dont wanna drill the tank ours are made that way with a place welded in
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Thanks Marv Paul |
Re: Air compressor: rebuild or replace pump?
Some of the compressors use a t fitting at the inlet
http://2.bp.blogspot.com/-ynDHNO_Klr...422_094716.jpg |
Re: Air compressor: rebuild or replace pump?
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The 1/4" line is probably for the unloader valve, it empties the pressurized air out of the cylinders/line so the compressor starts easily and doesn't damage the motor. |
Re: Air compressor: rebuild or replace pump?
Dredging up an old post. I'm finally getting around to installing the Schulz MSL 10 Max pump I got in the fall. The online pulley calculator I found says that my 3450rpm motor with a 4.25" pulley will spin the 10" pulley on the Schulz pump 1466rpm. The Schulz website says my pump should spin at 860rpm. Will the 606rpm increase be too much for it?
If I can install the old pumps 14" pulley it brings the rpm down to 187 over the recommended pump speed. On the other hand if I find a 2.5" motor pulley it puts me almost spot on Schulz's 860rpm Am I missing anything here? Thanks Paul Schulz site: http://www.schulzamerica.com/product...e/max-140-psi/ Calculator site: http://www.blocklayer.com/pulley-belteng.aspx |
Re: Air compressor: rebuild or replace pump?
Spinning the pump too fast will increase the heat generated in the head and create additional load on the motor. Not an expert but would be best if you can swap the 14" pulley to the new pump AND buy a new motor pulley of the correct size to get the recommended RPM. Too small a motor pulley might not leave enough contact area to drive the belt.
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Thanks Parrot. I found this information on one of the Ebay sellers pages. It says to spin it between 700 and 1000. Paul |
Re: Air compressor: rebuild or replace pump?
Typical motor rpm's are usually around 3600 or 1800. Dead parrot is spot on about spinning at 1,000 rpm's or less.
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Re: Air compressor: rebuild or replace pump?
Thanks guys. My motor data plate says it spins at 3450rpm. My old pump pulley and the new pump have different shaft sizes so that swap is out. Using a 2.5"pulley on my motor will spin the new pump at 902rpm.
Paul |
Re: Air compressor: rebuild or replace pump?
Paul
Mc Master Carr is up your way and may have the pulley(s) you need. https://www.mcmaster.com/#pulleys/=16ibzs2 Richard |
Re: Air compressor: rebuild or replace pump?
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Paul |
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