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Nilfisk gmd how to inspect carbon brushes

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Posted on Jan 02, 2017

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SOURCE: Motor carbon brushes

hi try potts in derby babbington lane ,very help full

Posted on Apr 09, 2013

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hi try potts in derby babbington lane ,very help full

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Nilfisk vacume bearings

Hi There, If you could provide the model number of the machine that would help. However as a general rule if it is the motor bearings you are after then normally you replace the entire motor. If it is the roller brush you are needing bearings for you can get them from any bearing supplies store. If you are looking for any nilfisk parts in Australia then vacuumspot is the go.

May 27, 2012 | Vacuums

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It could be a few issues. It could be a thermister switch, carbon brushes or electrical. you could take it to a repair shop with free estimates. This way they will diog. the problem and might be able to save you some $$$$$

Nov 10, 2009 | Nilfisk GM 80 Bagged Canister Vacuum

1 Answer

How to change carbon brushes

You need to know that very seldom will new carbon brushes alone `FIX`a motor in todays vacuums as they are higher RPM than those of 30 years ago.
On a salvageable motor a good rebuild procedure will generally include repacking bearings, cleaning suction fans and reseating new brushes with an abrasive seating stone at low speed with a motor run in device with variable voltage

That said, I have not done a HENRY in years but it likely will contain a generic AMTEK Lamb type motor as it is sold as more durable vac.
On a traditional vac motor, carbon brushes are removed by releasing a clamp over the brush. The brush holder will have either a flag terminal on it where the wiring will disconnect from the side, or a flat flag terminal which slides into a pocket on the carbon brush housing.
. If you are going to the trouble of replacing the brushes, remove and inspect the old ones for wear and chipping. Also inspect the commutator surface on the motor where the brushes contact. If there are any curved gaps between segments, or if the com is worn like an apple core , you need a motor complete.
If the motor has simply worn to the point where a brush has stuck or worn to nothing, you may be bale to reseat the new brushes, however any evidednce of BLUE sparks or noise is not a good sign . Best of luck. Post back if you need more help

Nov 01, 2009 | Henry Numatic "" Canister Vacuum

1 Answer

Motor won't start

Most times this will be caused by one of 3 items, the cord, the switch or the carbon brushes in the motor. Inspect the plug area on the cord for strain twist it gently and look to see if the cord appears a bit white where it meets the plug or if the cord appears crushed just before the plug.
Also inspect where the cord meets the body of the vac for the same signs of wear or any locations where it may have been caught in the power head , etc.
If you have test meter, check for resistance change at the plug while twisting and finally try the same twisting with the vac plugged in if necessary but keep your fingers back from the plug in case the cord blows... gently twist and pull slightly to see if the motor continues to run.
Most often when a switch fails it just dies and doesn't become intermitant... so with a meter it will generally test good or bad , nothing else..
Sometimes on a well worn vac when the motor doesn't start the carbon brushes in the motor have worn down. A heavy duty motor such as the Rexair can often be rebuilt if brushes are required.
If you turn the machine on and bump or jolt the side of the body as if to spin it, you can often "trick " the motor into starting. If this happens it is most likely a carbon brush issue , if not time for a new motor.
Rainbow/Rexair machines have a fairly good motor however because of how they run drawing moist air through they often rust as they age. This is a tedius rebuild and best left to a pro shop with parts on hand if requiring brushes. Most shops will simpley scrap a worn motor if rusty and replace it completely.
Before you spend big $ on a repair or replacement....
One last thing....... pull the exhaust cap at the back of the vac. You will seen fine powder dust and residue.Wipe your finger across it. This is what the Rexair releases into your home each time it runs, but you don't smell it because it comes out in the form of after a spring rain.
That same humidity is rusting your motor gradually year by year. Although this motor has a long life span, consider that you have been breathing dirty humidity as it runs. If you put orange drink crystals in the water bucket and run the vac, the exhaust air would smell like orange juice,... so what is in the tank comes out in the air, including your dirty water.
Most Rexair owners buy thinking they are helping to reduce allergins.. yet what is on that exhaust plug proves otherwise. If your home is essentially carpet free and you are vigilant maintaining and rinsing the bucket, you might consider rebuilding this vac.. Otherwise consider a good High end European vac like a SEBO,MIELE, Nilfisk etc for better filtration and reliability

Oct 10, 2009 | Rainbow E series Canister Wet/Dry Vacuum

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Nilfisk GD930 vacuum-can't find replacement brush

Hello mddamus,
Try this link to a Nilfisk supplier, speak with a rep and they should be able to identify exactly what you need and provide that part for you..

Dec 06, 2008 | Nilfisk GD 930 Canister Vacuum

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