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24th April 2022, 03:25 PM #1Senior Member
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Can't tighten pad on Bosch GEX125
So I was sanding away this morning and the pad came off my Bosch GEX125 random orbit, I run the 150 pad on mine exclusively. So screw it back on and back to sanding I thought, but buggered if I can work out how to tighten it up.
The pad is held on by a single central bolt.
IMG_2930.jpg
That bolt screws into a threaded bush that is presumably a press fit inside a bearing, pictures below with the bearing retaining plate removed so you can see that it is a bearing.
IMG_2931.jpg IMG_2929.jpg
So I can start the thread OK, but the centre of the bearing spins, as bearings are supposed to do, and I have no way to lock it and stop it from spinning to tighten the bolt. I even got desperate enough to dig out the instruction booklet but that just says to tighten the bolt. What am I missing? I can not fathom how this was ever meant to work or what could be wrong that it doesn't work now. It will not self tighten when running, it unscrews itself. Any ideas?
Cheers Andrew
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24th April 2022 03:25 PM # ADSGoogle Adsense Advertisement
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24th April 2022, 05:24 PM #2
Does the motor turn the right direction so that the thread will automatically tighten when running? I assume that bush you refer to is attached to the bottom of the motor shaft and the thread is offset to give the orbital action.
Dallas
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24th April 2022, 05:58 PM #3Senior Member
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Originally Posted by Treecycle;[URL="tel:2277943"
The bolt doesn’t tighten when the motor is run, it unwinds itself, which also seems like a design flaw.
Cheers Andrew
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24th April 2022, 06:22 PM #4
20220105_3 601 C7B 161.jpg
After looking at the photo of the diagram above and your photos it appears to me that this piece is actually broken into two, one piece still in the bearing and the other around the thread on the pad
Hope this helps
Screenshot 2022-04-24 152007.jpg
Regards
Rick
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24th April 2022, 07:46 PM #5Senior Member
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Thanks Rick, that answers my question, exactly the info I was unable to find myself.
very disappointing, I have had the sander for a few years but I reckon it would be lucky to have done 20 hrs of work. Knew I should have bought a
Festool from the start.
Cheers Andrew
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24th April 2022, 07:53 PM #6
You can order online replacement parts
GEX 125 A - 0 601 372 037 | Product Detail Page | Power Tools | After Sales Service
Just make sure you select the correct model (the one in the link is my guess)
as you can see the cost isn't great for that part
or you can take to a repairer and have them give you a quote
Rick
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24th April 2022, 08:18 PM #7Senior Member
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Thanks again Rick, unfortunately the part for my model comes as a sub assembly for $112 plus postage, that's a lot of coin if they only last 20 hrs or so, on a $290 sander.
I have a metal lathe so might have a look at what's involved in machining one myself.
Thanks again.
Cheers Andrew
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24th April 2022, 08:51 PM #8
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25th April 2022, 12:59 AM #9China
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From what I have heard these sanders are not what they are cracked up to be contact Bosch and tell them what you think, you never know they may come to the party
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25th April 2022, 08:02 AM #10Senior Member
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Bosch sander
Two weeks ago we had exactly the same problem at my local Men's shed. Our solution was to order the broken part from a spare parts dealer in UK. About $35 plus postage. i cant get the web address until tomorrow but will post it here.
cheers.
Yachtie
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25th April 2022, 01:07 PM #11Senior Member
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OK here is the solution.
Firstly the problem once disassembled, these 2 parts should be one!
IMG_2932.jpg
At this point it seemed like the easiest solution was to bore out the flange, machine a new threaded shaft long enough to go through the flange and inside the bearing, making it a press fit. So that's what I did.
Parts machined.
IMG_2933.jpg
Then pressed together
IMG_2934.jpg
Its all reassembled and I have test run it for around 5 minutes and all seems good. Time will tell if this repair is better or worse than the original.
This sander seems to be a classic example of how the world has gone, Bosch made a pretty good sander and then cut just enough corners to meet a price point that ultimately made it a bit crap. I wouldn't rush out to buy another one.
Cheers Andrew
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25th April 2022, 06:27 PM #12GOLD MEMBER
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25th April 2022, 06:57 PM #13Senior Member
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25th April 2022, 07:59 PM #14
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27th April 2022, 08:10 AM #15Senior Member
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Bosch sander parts
The UK spare parts dealer we ordered from is Home - Spare Tool Parts
The order was placed 10 days ago but not yet arrived here, but early days yet.
cheers
john
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