Question about Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil Roofing Nailer, 70 120 Psi

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After several years of reliable service my dewalt 708 has become very noisy. The belt tension is correct and the brushes are ok.

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What I would recommend is removing the belt and running just the motor. I think that the bearings on the armature are seizing up and creating the noise. The fan bearing is hard to remove. Let me know if this is the case and I will give you directions on how to do it.

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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1 Answer

Serpentine belt noise around steering power united and alternative


The usual causes of a noisy belt - a squealing noise - around a pulley is because of either incorrect tension of the belt, or it has become worn/cracked/shiny on the inside and needs replacement.

In some instances the pulley itself can become worn.

The first thing you should do is check the tension of the belt - not too tight and not too slack. You haven't said what sort of car you have, but it will either have an automatic or manual tensioner.

Feb 02, 2017 | Cars & Trucks

1 Answer

Roller brushes won't work


Remember, this brush is belt-driven (not air-driven), so if the brush stops working, then there is probably a problem with the belt. The device is likely set to stop the brush from spinning if the belt tension is not correct. My guess is that the belts have become too loose, or there is a malfunction with the sensory mechanism which detects that.

I will trust that your product does have the in-house warranty.

May 19, 2014 | Shark Navigator Bagless Upright Vacuum

1 Answer

Replaced belt still makes noise


Dear John,

Try this. Is could be because the old belt was slipping and has polished the pulleys or "glazed" them. So before you replace that noisy belt scrub all of the pulleys well with a scotch brite pad, or a good wire brush to remove the glaze and rough up the surface. Clean them off with brake cleaner afterward. Belts work by friction so if the surface is polished too much the belt will slip, Or try adjusting the belt TENSION will correct the problem. If this does not correct the problem you can try removing the belt altogether, and "reversing" it, and then reinstalling and properly adjusting the tension.
Hope This helps.

Alex :o)

Nov 21, 2011 | 2000 Dodge Grand Caravan

1 Answer

I have problem with my swift sport,the belt is making noisy sound


Check the belt tension, it could be noisy because it is slipping on the pulleys. If the tension seems ok, you can buy a belt dressing spray which may quieten the operation, but it is probably better to replace the belt as it seems to have become hard and polished to make it squeal. Good luck and please rate this solution.

May 21, 2011 | 2006 Suzuki Swift

1 Answer

My belt is burning do I need anew belt and just align and clean brush. Motor sounds ok


Belts start burning because they've become too worn and loose to keep a good grip on the brush and motor shaft. You do need a new one. When replacing, ensure it's in the correct position by rotating the brush a few times. Make sure you've got the correct amount of tension on it. Too loose and the belt will slip and burn out again. Too tight may cause breakage as well as excessive stress on the motor.
It's often best to allow even a simple fix to be done by a service tech.

Dec 21, 2010 | Panasonic MC-V7720 Bagless Upright Vacuum

1 Answer

Dryer operates but has become noisy. I'm guessing it's due to a worn belt. I have operating instructions, but no troubleshooting guide or maintenance manual to show how to correctly take it apart to check...


The top and front panel must be removed to get to the belt. Also if the belt is worn buy a roller for the tensioner as well for they wear fast and the inner bearing causes the noise you heard

May 20, 2010 | Dryers

1 Answer

Hotpoint WF220P has become very noisy during spin, especially at high revs. Can it be worn brushes or motor, or bearings? Otherwise all is OK.


Remove drive belt, and spin drum by hand, if it feels rough or noisy, then the main drum bearings are worn.
If no noise from drum, could be a motor prob.
Please rate ,my solution.
Thanks.

Nov 02, 2009 | Hotpoint Aquarius WF220 Front Load Washer

1 Answer

My engine got so noisy and when i removed the engine cover the timing chain looked a bit loose


The timing belt shouldn't cause the engine to be noisy unless it is so loose as to slap parts surrounding it. The engine will become noisy if a loose timing belt skips a tooth or 2 and messes up the timing of the engine.

On another hand, if it is visually loose at the timing gears it is imperative to get the system looked at by a mechanic. The belt may be ok but the tensioner may need to be replaced but if you replace the tensioner, you may as well replace the belt. Timing belt should have some play at the point between the crank pulley and the cam gears.

Take it to a certified mechanic to have it looked at and measure the play on the timing belt to check if it is still in specifications.

Timing belts are only good for about 60,000 miles. If you are over that I would recommend replacing the belt and tensioner but may vary from car to car. Check a repair manual for specifics to your vehicle.

Oct 18, 2009 | 1996 Nissan Sentra

1 Answer

How is the V-belt tension adjusted (Hoover Model U6439-900)or how do I know if the tension is correct? There seems to be a lot of "play" in the belt and I'm wondering if that is the reason the brush roll...


The V-Belt is not adjustable. There are two ways the belt has no tension: (1) when the handle is upright, a mechanical lever takes the drive tension off the belt, and (2) the brush roll lever setting you described. The upper handle would have to be in the floor cleaning position to check the belt, not in the storage position.

Oct 07, 2009 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Hoover Wind Tunnel V-Belt no longer turns brush


that is the correct belt what you dont see is a tension pulley that when the handle is released pushes on top of that belt giving it the tension it needs. try replacing the other belt, even if it isnt broken it could easily be stretched out ( all belts of that type should be replaced every year - even if you didnt use the machine at all ). if that doesnt work that tension pulley could be damaged you would need to take the bottom of the machine apart to fix that.

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