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Dental suction pumps

Motor blew and motor was send for rewinding. upon return motor runs but their is no suction taking place.

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Hi adi
Your pump sounds as if it is air bound...that is air that is trapped inside of the impeller housing and not allowing the pump to pump water normally....prime the pump using water to dispel the air
Bud

Posted on Apr 25, 2013

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Posted on Jan 02, 2017

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john224
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SOURCE: Pump motor runs but no suction, disassembled flute

Check the pump impeller inside for damage or obstructions. A clogged or broken impeller would fit your description of symptoms. If you find nothing in the pump your next step would be the filter.

Bypass it using a recirculate feature if one is present on the control valve.

Another test would be to try backwashing you filter if you can to see if the pump operates in that setting.

If none of those solve your problem post a comment with any details from what happened when trying these steps and we can look elsewhere for a solution.

John

Posted on Aug 28, 2010

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Pull the pump apart, maybe the impeller is broken, put a hose up the suction line to check for blockage, is there a non return valve in the suction line? Maybe just an air leak, only takes a pin hole !

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Here's a few things to try:
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3. On the bottom side of the pump is a primer pump. You push the stem several times to make sure that the check ball on the inside is operating freely. You may need to clean it if it's operation is suspect.
4. When initially starting the sprayer up, set the control knob to prime and pump water into a waste bucket. Turn the knob from prime to paint and try to pump water through the tip of the gun. If the pump shuts off on prssure, but nothing comes out of the tip, roll the lever 180 degrees and try it again. Reversing the tip puts in the cleanout mode, and reverses the flow through the tip, backwashing it. Once clear, return the tip to the normal position.
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I wouldn't consider rewinding a motor of that size unless it's impossible to get a replacement, in which case I'd modify the pump to take a common motor.

It's cheaper to build a small motor than it is the rewind it- it's quite a job to rewind a motor, and small motors are hardest.

Look on the motor tag- you should see RPM, HP and Frame Size. These are the three things you need to know to replace the motor. If the shaft is odd, as it sometimes is in pump motors, you can always just replace the entire motor stator- the housing with the laminations and windings, with one from a different motor of the same brand, frame size, HP and RPM. Again, cheaper than rewinding the motor, but a little more work than just replacing it.

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