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Furnace water pump

Old 04-07-2012, 05:21 AM
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Default Furnace water pump

We bought a home about 1 year ago approx 1,400 sq. ft on 2 floors with a furnace that is between 15-20 yrs old. I know the unit needs to be replaced relatively soon but until then....

I hear a humming noise coming from the pump that runs the hot water through the system, is this the first sign that the pump is going to fail?

I don't remember it making this noise prior to last week. Any idea what it costs to have the pump replaced and is it something I can do myself with limited ability?
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Old 04-07-2012, 05:43 AM
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Should be an "oil port" on a circulator of that age, try a shot of machine oil first.
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Old 04-07-2012, 05:50 AM
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It normally humms - is it a Taco maybe 5 inches in dia by 8 inches? Thye normally leak before they fail in anyother way - as long as its circulating let it be ... they tend to last the life of the furnace except for leaks at the gasket end.

Just a homeowner - But I defer to any plumbers or HVAC guys here (like Dave down below who has helped me)
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Old 04-07-2012, 05:51 AM
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What kind of a pump is it? It should say B&G or Taco, etc.
The B&G can be oiled, the Taco is water lubricated.
Are you positive that the noise is coming from the pump or could it be from something near the pump?
Pics would be helpful.
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Old 04-07-2012, 06:41 AM
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Originally Posted by davedowneast View Post
What kind of a pump is it? It should say B&G or Taco, etc.
The B&G can be oiled, the Taco is water lubricated.
Are you positive that the noise is coming from the pump or could it be from something near the pump?
Pics would be helpful.
Exactly Dave....
Sometimes there's a small cube relay at the pump that allows 24volts from your system to close a 120V circuit to turn the pump on. Heard many of these make humming noises.
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Old 04-07-2012, 07:02 AM
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When running properly, it's pretty much silent, except for the faint hum of the electric motor running. Any mechanical noise should be regarded with suspicion.

Mine has a B&G. this Winter the pump started making a loud, screeching noise. Light oil (three ports) did the trick for a while, but then it started again. Serviceman replaced the coupling between the motor and pump (an hour's work), and noted that the motor armature had about 1/4 inch play, but a few weeks later a different noise started. It could be bearings, or just (because my pump is 35 years old) just total replacment. The cost of fixing the parts one at a time could cost more than just replacing the whole thing. If you are handy, you can rebuild it yourself, but removal entails draining the whole system.
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Old 04-07-2012, 12:06 PM
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It's a Bell & Gossett, 1/12th hp, about the size of a football. I don't have or should I say I do't know how to post picks.

I'll google the brand to find where the oil ports are, are we talking 3m oil or some other kind of mach oil?

Thanks!
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Old 04-07-2012, 01:04 PM
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Originally Posted by 08087 View Post
It's a Bell & Gossett, 1/12th hp, about the size of a football. I don't have or should I say I do't know how to post picks.

I'll google the brand to find where the oil ports are, are we talking 3m oil or some other kind of mach oil?

Thanks!
Probably a Series 100, like mine.

http://www.statesupply.com/pumps-for...ll-and-gossett

The oil ports are all on the top - on both sides of the motor and one in the between the motor and the pump, just forward of the coupling, just forward of the nameplate, 3 in 1 oil or so will do the job- just a few drops once a year.
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Old 04-07-2012, 01:13 PM
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Thank you, will try and take care of it tomorrow!
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