Gareth J
Member
- Messages
- 3,338
- Location
- North Cornwall
Just changed all the bearings on my Bosch 4,1/2"
http://m.bosch-professional.com/gb/...=true&sPath=/dispatchToProductInCategory.html
The main disk bearing had been grumbling for a while but finally gave up and all but seized. For the sake of a few quid, I figured it was worth a try replacing all the bearings. Thought I'd post here in case anyone else's tempted.
Main bearing is sandwiched under large crown gear which is press fitted onto disk shaft. Needed carful heating (plastic housing!) And a press out setup in the vice to remove.
Once this is off, another problem presents itself- the bearing is molded into the plastic housing. I turned the molded lip off in the lathe but it could be chipped away at with a knife. I tried to keep a bit of a lip, just enough to be able to pop the old bearing out and squeeze the new in.
Two, small motor end bearings much more straightforward to get off, did have to destroy tail bearing to get it off though. These were ok really but while I was ordering...
I had to ditch a thin sprung steel dust washer the sits under the disc shaft as it was damaged when pressing off the big gear. Now runs an old school felt dust washer.
It's all back together and works fine. If you're presented with the same trouble though, it's a lot of faff, bearings cost me almost a tenner, I still only have an old grinder and new ones aren't all that expensive. Satisfaction to effort ratio; not bad. Sensible use of my time? Probably not.
http://m.bosch-professional.com/gb/...=true&sPath=/dispatchToProductInCategory.html
The main disk bearing had been grumbling for a while but finally gave up and all but seized. For the sake of a few quid, I figured it was worth a try replacing all the bearings. Thought I'd post here in case anyone else's tempted.
Main bearing is sandwiched under large crown gear which is press fitted onto disk shaft. Needed carful heating (plastic housing!) And a press out setup in the vice to remove.
Once this is off, another problem presents itself- the bearing is molded into the plastic housing. I turned the molded lip off in the lathe but it could be chipped away at with a knife. I tried to keep a bit of a lip, just enough to be able to pop the old bearing out and squeeze the new in.
Two, small motor end bearings much more straightforward to get off, did have to destroy tail bearing to get it off though. These were ok really but while I was ordering...
I had to ditch a thin sprung steel dust washer the sits under the disc shaft as it was damaged when pressing off the big gear. Now runs an old school felt dust washer.
It's all back together and works fine. If you're presented with the same trouble though, it's a lot of faff, bearings cost me almost a tenner, I still only have an old grinder and new ones aren't all that expensive. Satisfaction to effort ratio; not bad. Sensible use of my time? Probably not.