I have a MasterCool 1.5cfm 2-stage vacumm pump that stopped working this past weekend. It is less than a year old and been used about 3 or 4 times.
I was in hte process of pulling a vacumm on my truck when I swithced it off for about 20 minutes to check for leaks. When I turned it back on, it started to shake violently. I immediately shut it off. When I hit the powere switch the pump does not spin up. It only makes a humming sound. The oil is new and at the correct level. I left the purge valve open for 2 minutes before trying to pull a deep vacuum. For the life of me I can't figure out why it will not start.
Maybe the thermal cutoff tripped and needs to be reset. Any thoughts?
While it was off but connected to an evacuated system, it could have sucked oil back into the pumping chamber, leading to a hydro-lock condition. Always close the inlet valve while checking for leaks to prevent this. It might clear by itself eventually. Turn it upside down with the hose off and the valve open and see if oil comes out of the inlet.
If that's what happened, find some way to turn the motor by hand (be sure to rotate the same way it normally turns) and with slow moderate pressure you should be able to clear the oil out. First get as much out of the inlet as you can.
Does that motor have a start capacitor. If it opened up the motor will just hum and not turn and get hot.
You might want to give Mastercool a call and explain to them what your issue is. While not the most courteous people (New Jersey) they can be helpful.
Jack If it has two I would think one would be the start cap and the other a run cap. I wouldn't have thought it would have a run cap on that small of a motor. I usually get my AC start caps from the local AC supply house. Usually several $. But if it's under warranty, I'd let them supply the parts..
New capacitor, or new pump?
I don't know the value of the caps, that will be marked on the side of them. Different motors take different values. Grainger Industrial Supply is in most large cities, you might try them. But if it's the motor or the pump, and it's under warranty, they 're going to tell you don't have any now that you've went inside...
Allied Electronics has a fair amount of industrial stuff, or Mcmaster.
Disconnect the capacitor and confirm that it is bad with a VOM. Test for DC short, also charge it up with meter on ohms, then reverse the meter leads. It should show some resistance for a time until it charges the other way. If it shows infinity all the time, it is open. If it has a metal case, also check for short from the live terminals to the case.
Some of VOM's have a range on them to check the value of the Caps also. It should be close to the marked value on the cap..
I sent the pump back to Mastercool and they said it is not under warranty. It is going to cost me $155 for them to fix it. Should I just trash it and buy a new pump or get it fixed. Mid you I only had this pump less than a year and I used it maybe 3 or 4 times. This seems like a manufacturing defect that should be covered under warranty. cheap piece of s**t
That's odd as Mastercool warranty is for one year from date of purchase.
Yea it appears that Mastercool does not honor their warranty.
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