Help with a dead Robur?

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Help with a dead Robur?

Postby James Hoffmann on Wed Aug 20, 2008 4:29 pm

I may reveal my technical ignorance in this thread but I'd be grateful if anyone knows the answer:

A friend's Robur died the other day. When you switch it on the magnetic switch part with all the terminals (I don't know the technical name here!) makes a buzzing sound but the motor won't spin.

I can't get the shaft to turn - it seems jammed. I opened up the bottom, and having removed a goodly quantity of ground coffee, compared what I saw to a wiring diagram and all seemed to be in order in terms of the right things being wired in where they should be.

Any ideas? Is the motor dead? What is making the nasty buzzing sound?
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Re: Help with a dead Robur?

Postby geir oglend on Wed Aug 20, 2008 8:02 pm

James, you might have beans or some crap jammed in the burrs, loosen the grind a few turns and see if that helps? Turn the grinder upside down w/ some light taps to shake thing loose!
You will have a hard time trying to turn the burrs on a robur with your hands.
Be careful they are sharp and unplug the thing.
Good luck.
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Re: Help with a dead Robur?

Postby James Hoffmann on Thu Aug 21, 2008 12:46 am

Nothing in the burrset - took them all out (for a good clean too) and still couldn't turn the central shaft. Very weird!
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Re: Help with a dead Robur?

Postby Brian Ludviksen on Thu Aug 21, 2008 11:46 am

Hey James,

If you can not get the shaft to turn by hand with the collar off or if the shaft doesn't spin when turned on with the collar off (watch those fingers!) then it could be that the motor has seized.

Hope this helps,

Brian
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Re: Help with a dead Robur?

Postby James Hoffmann on Thu Aug 21, 2008 12:02 pm

I was worried that was the case. New motor then?
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Re: Help with a dead Robur?

Postby paul_pratt on Thu Aug 21, 2008 5:16 pm

James a new motor is highly unlikely, these things are very robust. If you can't rotate the burrs by hand sounds like the bearings are seized. It should be possible to have it rebuilt and have the rotor taken out to check for coffee jamming it or if the bearings are shot. To remove and install new bearings is quite cheap and simple for any workshop.

Coincidentally I helped someone with a broken pump motor last week. The new pump leaked (they seem to come free with this feature the past few years no matter which brand) back into the motor seizing that end bearing. Motor wouldn't turn, just hummed. 20 mins to take it apart, clean it up and install a new bearing.

Someone once gave me a Major that was full of coffee inside, so much that the contactor (that buzzing you hear) couldn't switch as it was full of grounds. Same for the motor. A good vacuum, a new contactor and new bearings and it was good to go.

Paul
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