Thread: Can't tighten pad on Bosch GEX125

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.

Originally Posted by Treecycle;[URL="tel:2277943"

2277943[/URL]]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.

The bush it attached to the bearing which I believe is attached to the motor shaft, and yes it is offset for the orbital action.

The bolt doesn’t tighten when the motor is run, it unwinds itself, which also seems like a design flaw.

Cheers Andrew

Originally Posted by AJ.

IMG_2930.jpg


IMG_2929.jpg



Cheers Andrew

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

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

Originally Posted by AJ.

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

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

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

Originally Posted by AJ.

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

You obviously have some skills AJ so post pics if you manage to create one

Rick

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

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

Originally Posted by warrick

You obviously have some skills AJ so post pics if you manage to create one

Rick

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

Originally Posted by AJ.

IMG_2932.jpg

Is that a zinc casting? I've got one of these sanders and that's the third one of heard of with that problem. Nice recovery.

Originally Posted by aldav

Is that a zinc casting? I've got one of these sanders and that's the third one of heard of with that problem. Nice recovery.

It is Zinc plated, it could be cast steel, definitely not cast iron. Now I realize what the problem was my googling shows that this is indeed a very common fault with these sanders.

Cheers Andrew

Originally Posted by AJ.

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

Well done AJ, hope this lasts a while

Rick

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