W/Machine Motor: removing pulley

two wheels good · 02-05-2018 12:40PM #1

Hello
This is an old Bosch w/machine with a Siemens motor.
I need to remove the motor belt pulley in order to replace the bearing. It's not secured by a bolt as I'd expected. It looks like a press fit.
I thought I'd have have a go at it with a pullers but I'm wondering if the pulley will go back on securely afterwards. Any tips welcome.

The brushes are very worn too but that's a secondary problem. No point looking for parts until I sort out the pulley. Thanks

two wheels good · 02-05-2018 05:36PM

Based on info from a youtube video removing the pulley is real chore that my bearing pullers won't cope with. According to a local repair shop the pulley will "never come off". (I don't think he wanted the job!)

Anyone know of a source for a new or second-hand armature or a second-hand motor? Siemens motor 304 7563 AA3

gctest50 · 02-05-2018 05:47PM

Hydraulic press is really what you need to take it off and push it back on again

AL 555 · 02-05-2018 05:58PM

Have you tried heating the pulley and using a pullers...?

two wheels good · 02-05-2018 06:57PM

AL 555 wrote: »

Have you tried heating the pulley and using a pullers...?

That was the plan. But the face on the stem of my pullers is too wide and flat. Trying to wedge a steel pin between pulley and pullers is another complication. (Just occurred to me: a ball bearing might be a better option)

Looking at the youtube vid it will need serious heat and force.

The machine has given long service. Shame to give up on it for the sake of a (cheap) bearing.

The Red Ace · 03-05-2018 10:51PM

if you heat it you will break down the insulation in the armature windings and probably loosen the plastic cooling fan, you will need a hydraulic pullers and a 1/4 drive 8mm socket to extract it or a press as has been suggested. the pulley will go back in ok just put a drop of locktite on the shaft

two wheels good · 06-05-2018 10:52PM

gctest50 wrote: »

Hydraulic press is really what you need to take it off and push it back on again

The hydraulic press was the solution - and seeing how much pressure it required any use of heating and pullers I could have applied would have been futile.
[EDIT - oops! premature submit]
New carbon brushes and all reassembled. Makes a change to look forward to doing the laundry.
Plus I've now discovered a helpful local engineering company who'll do some small welding jobs for me.

Thanks to everyone for input.

W/Machine Motor: removing pulley

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