Washing machine motor repair

[duffsparky]

Hi All,

I’ve been trying to repair a Hitachi FW133 from the 1980’s (Servis 600 series and possibly Electra something or other). The motor bearings need replacing but I can’t get one of the bearings off because I can’t get the drive pulley off. Any one know how to get the pulley off the main drive motor shaft. Any motor info/details that may have been stuck on the motor have long since gone, so if any one could suggest a manufacturer/supplier that might help.

I assume the pulley is either shrunk or threaded onto the rotor shaft as I can not see any evidence of splines or woodruff key fitting.

If the pulley is shrunk on, does any one know the sort of temperature required to get it off without cooking the rotor windings.

If the pulley is threaded on, I need to establish if it has is a right-hand or left-hand thread. Presumably the pulley would tighten in the opposite direction to the rotation of the rotor when the motor is under the heaviest load, but when is that? Perhaps the position and angle of the brushes could help to identify pulley thread direction? See diagram at link below.

http://www.flickr.com/photos/40455430@N03/5702701055/in/photostream/

Kind regards.

[Martin]

Re: Washing machine motor repair

duffsparky wrote:Hi All,

I’ve been trying to repair a Hitachi FW133 from the 1980’s (Servis 600 series and possibly Electra something or other). The motor bearings need replacing but I can’t get one of the bearings off because I can’t get the drive pulley off.

You can’t it’s either welded on or ‘sweated’ (under high temp) on. 🙁

[washman3]

Re: Washing machine motor repair

i’ve done quite a few older hotpoints and they were always sweated on with little splines.attach a small bearing pullers to the pulley,avoid trying to bring the bearing with it,tap it back out of your way if you have to.! with pullers attached apply some pressure and some rapid heat directly on pulley only,keep applying a little more pressure as you heat.
your heat source should be from a small but rapid heat nozzle.
very important—- wear safety specs.!! and have some cold water ready to dip the pulley shaft in(not the comm though)
on the odd occasion i’ve broken one on removal,but that can be ok as most motors,even modern,have same pulley.
you can pick up another from another old motor. Good Luck…

[duffsparky]

Re: Washing machine motor repair

Wish I had seen your reply sooner washman3 coz I’d have tried to get the pulley off again and do the job properly but instead I’ve solved the problem solved, for now at least, by refurbing the pulley end bearing in-place.

As I couldn’t get the bearing off the pulley end (coz I couldn’t get the pulley to come off) I decided to kill-or-cure the old unit; at worst I’d have to buy a new armature (if available) or motor. So I refurbished the bearing in-place by popping off the bearing shield (which ended up destroyed), cleaned the bearing, regreased it, fitted a shield taken off the worn bearing from the other end, fitted a new bearing on the other end and voila a nice smooth spinning armature. I also got the commutator re-faced before re-assembling the motor, which is now re-fitted back in the machine and on its second wash. Not bad for £20 total cost (£8.57 for 2 bearings [only one used] £10 for commutator re-facing and the rest for a finger full of grease. Mind you the time it has taken I could have bought several new motors if I’d been at work.

To be honest at high speed the machine seems a little loud but that may be the drum bearings going; I’ll have to keep an ear on it.

Regards.

[Author]

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