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Posted on Jan 28, 2009

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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PB4-60 will not run. Apply power in service mode it will start to turn for about 1 second then stop. Impeller turns freely no binding. Capacitor on top tests as zero then infinity on multimeter.

If cap is old, you should assume bad cap. If same problem with new cap, you can try a 1 phase motor ''start booster'', which connects to the same two wires on the cap; (and the cap remains in the circuit. You are merely _adding_ the booster). // Regarding testing. You are showing ''overload'' after trying to start up. But this would happen if cap is bad. If same test result after replacing cap (and booster doesn't help), then the start winding on motor is burned out. If you knew what the exact resistance readings between ''common'' and ''start'' and ''common'' and ''run'' are supposed to be (with all wires _disconnected_), then you could confirm burnout without buying a new cap. In the absence of such info, only a new cap can tell you for sure. (An old ''tight'' motor and/or compressor can be made to run with a ''start booster''... Assuming the start winding is _not_ burned out).

Aug 15, 2015 | Plumbing

1 Answer

What would cause a circulator failure?

I am going to assume the circulator pump is on a hot water circulation loop. Turning the water back on could have stirred up the sediment that has collected in the bottom of the water heater. This could clog up and possibly ruin the impeller. Running for an extended period without circulating water can overheat and damage the pump also. It is a good idea to hook a hose to the water heater drain and flush out the sediment periodically. Hope this helps.

Jan 18, 2014 | Bell & Gossett 103252LF NBF-22 Circulator...

1 Answer

I have a 0011 BF4-J Taco circulating pump with a bad impeller, can it be replaced and how? Where can the new one be obtained with instructions to change it. Thank You

You have a Taco Cartridge Circulator pump. You cannot replace the impeller. You can buy a new cartridge on line and install it your self. Be sure the system is not pressurized. When you remove the motor and then the cartridge expect water to run out as it opens the water lines. If it was installed like I like to do there are two valves one at each end of the pump, close those then replace the cartridge, you will not spill much water that way.

Oct 24, 2013 | Taco 0011-BF4-J 0011 Circulating Pump

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I turned off pump to do maintenance to tank and pump will not restart ,i have power to pump ,removed fin cover and manually turns fine no play in bearing ,any solutions

Is this pump,. one of those flexible impeller pumps?
They can not be run dry-- So-- can you lubricate the flex. impeller with something slippery, and compatible with what you are circulating-- or pumping. (Not drinking water, or a fish tank, right?)

If this is a regular centrifugal pump, is it possible that something is caught between the impeller and the housing, when it is all tightened up?-- can you turn the impeller by hand, thru the inlet opening?
Will the motor start it with the housing removed?

Give us some more clues, and we'll dig deeper.

Mack B

Jan 29, 2011 | Little Giant 4 Md Sc Pump Head Less Motor...

1 Answer

My home has a steam boiler that supplies heat for the 1st and 2nd Floors. There is a hot water system from the boiler with an InLine Armstrong circulator pump that supplies heat to the basement. The pump...

Yes, the manufacturer should have a parts kit for replacing the orings and's probably leaking right where the motor meets the impeller...there should be a seal inside there...the rebuild kit should have a blow-up diagram to assist you in changing parts

Jan 22, 2011 | Armstrong Tool Armstrong S25 BF InLine...

2 Answers

How to remove the impeller off my Type UP26-96F Grundfos circulation pump

Most of these style knock off in a counterclockwise direction. The impeller is usually threaded onto the shaft that way. A small brass drift and hammer should move it easily.

Jan 08, 2010 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

Pump will not run when it is hot

Metal heats as it expands so if you have a fit that is tight to the maximum tolerance cold it can be rubbing as things heat up. If a motor is running inertia helps keep it going while the system heats but then it stops and once it has to restart, it can not develop the extra torque needed to get rotation started. Check for things such as sagging motor mounts on the pump motor, a worn bearing fit in a pump shaft or impeller assembly or a damaged wear ring inside the pump housing. Any sign of a rub would show you what to fix. It would be helpful if you clarified what brand and model the pump is and whether the whole unit was replaced or only a portion of it last year if these suggestions don't solve your problem.

Dec 17, 2009 | Plumbing

1 Answer

My pump is humming but not pumping the water, what is the problem?

You are right, it is not running since there is no water
that goes out. It is just humming - which be due to
stucked impeller or busted starting capacitor. Let's start with checking up the impeller. Unscrew the strainer, and take it off. At the suction port, try turning the impeller by your finger. This is to check if it is stucked. If it is stucked, open the bolt holding the impeller case, so that you can free the impeller from
being stucked. Once the impeller is free, you can assemble the pump and switch it on and make it run.
If it doesn't run, then the final touch is to replace the
starting capacitor at the topcase of trash pump. In
doing this, make sure that in the reassembly of the top case, you must maintain the right force to close
the top case bolts water tight. Just send you e-mail
for further assistance. God Bless you.

Oct 26, 2009 | Tsurumi Pump s Submersible Trash Pump -...

1 Answer

My new AO Smith 2HP pool pump won't pump water, just hums

I'm guessing that you replaced the motor that goes to the pump, not the pump itself. You know the motor works just fine. Is the motor rotating in the correct manner(clockwise or counterclockwise) in relation to the rotation of the pump? Have you checked the pump to see if the impeller is working/rotating? Is the motor hooked up to the pump correctly, so that the motor is turning the impeller? Are all connections to the pump tight, so there are no suction leaks? Have you primed the pump and purged it of any air locks?

Aug 11, 2009 | AO Smith 2 HP 115/230V 56C Replacement...

1 Answer


Plastic impellers and pump cases are great for circulation applications but tend to wear out in pressure and or dirty water applications. The space between the impeller and case gets larger as it wears until the pump just circulates water inside the case.
Pump selection is dependent on applications, with pressure, volume, suction, temperture and fluid to be pumped only a few of the considerations.
Check for restricted suction strainer and hose first, then look at discharge side for kinked hoses and other obstructions. Then open case and look for worn impeller and volutes, occasionally there will be something lodged in the impeller like string or plastic film. Replacing the impeller alone if badly worne may help but won't bring the pressure back to new pump specs, you will need to replace the volute or case too if they are combined.
I use cast iron pumps for pumping silt laden irrigation water and have to rebuild them every 5-6 years, My suction head is 3' and head pressure is 35 psi. frankly I expected better life from cast iron but have to take what I can get.

Aug 08, 2009 | AO Smith Plumbing

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