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4th May 2016, 01:53 AM #46
Did some thinking today and I'm actually pretty glad I didn't get any paint down yet. Inside the rear section of the case are two bearings with a shaft that runs through the centre.
The bearings are fixed in place with circlips on either side (two external on the shaft and two internals in the case). From what I can tell I'll need to put one of the bearings on the shaft with its external circlip in place, drive it into the body until it's against the inner circlip and then repeat the process for the other side with the shaft already in the body.
First problem is getting the bearings on the shaft, I know I can heat them up on a light bulb to make them expand for an easy fit but I'm a little worried about how I'm going to get them seated in the case. My bearing drivers don't fit over the shaft and I'm a little bit nervous about driving them in using less delicate methods.
Thinking about making up some 4" thick drivers out of wood with an appropriately sized hole in the middle for the shaft but I thought I'd ask here to see if I'm missing something. I also considered heating up the case with a propane torch to make fitting easier but I'd need to buy one and money is tight at the moment (stupid cars, don't ask haha).
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4th May 2016, 08:55 AM #47.
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4th May 2016, 10:22 AM #48
A hot air gun, I think I have one of those somewhere. Cheers!
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4th May 2016, 03:46 PM #49Woodworking mechanic
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The external diameter of the external circlips that fit in the shaft should be smaller than the bore in the case so why can't you fit both bearings and external circlips to the shaft then press the assembly into the housing then fit the case internal circlips ?
Ive had similar setups in small engines I've overhauled.
I don't think a light on the bearings is going to do a great deal beside that if the bearings have synthetic seals applying enough heat to cause a change in bearing diameter may damage them. Find some one with a press - the whole process will be done in minutes.
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4th May 2016, 03:56 PM #50
I don't think what you're describing is possible, I've done a little illustration to describe the order in which they're placed.
====[EX][BEARING][IN]=[IN][BEARING][EX]=====
So basically you've got two internal circlips fitted to the bore behind each bearing with the external circlips in front of each. The internal circlips have to be fitted first from what I can tell.
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4th May 2016, 05:44 PM #51Woodworking mechanic
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4th May 2016, 05:54 PM #52
Sorry - I suck at explaining things, it's actually the reverse of your first illustration.
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4th May 2016, 06:16 PM #53Woodworking mechanic
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Love diagrams
O/K - seeing that, my suggestion is out.
Looking at your photo of the shaft, there appears to be a central shoulder that the bearings come up to - is that correct? If so,there really is only one way to reassemble.
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4th May 2016, 06:19 PM #54
I have a feeling the internal circlips are actually whats used for registration of the bearings. So yeah, looks live I've got some fun ahead haha
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4th May 2016, 11:13 PM #55Woodworking mechanic
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I was looking at these areas on the shaft. Hard to tell from the photo whether these are slight shoulders.
image.jpg
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4th May 2016, 11:20 PM #56
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5th May 2016, 07:43 PM #57
Success! Managed to get the first bearing seated with a minimum of fuss. Here's my ghetto bearing fitting kit, couldn't find the heat gun I bought years ago so I just used a hair dryer I use for heatshrink.
Placed the bearing directly on the bulb for about 5 minutes, once it was too hot to pick up with bare hands I grabbed it with an oven mitt and it slid right onto the shaft. Then I let it cool down and started heating up the case, it was actually pretty easy to fit as the case wasn't very tight to begin with.
Just waiting on everything to cool down again and then I'll fit the last bearing!
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5th May 2016, 08:28 PM #58
Well I'm glad I bought extra bearings! For some reason the second bearing didn't want to expand enough to fit over the shaft. Tried driving it with a hammer but it was way too tight so I wound up having to take it back off again and broke the seal. Have a feeling the shaft might not have cooled down enough, will have another crack at it tomorrow.
Patience...
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7th May 2016, 09:34 AM #59New Member
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Sorry
Here is the link for tyres
2 Blue MAX Ultra 125 Urethane Band SAW Tires 260mm X 22mm FOR Woodfast Junior | eBay
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7th May 2016, 03:07 PM #60
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