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Restoration & Repair Tips Board

Pulling brake drums.

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AWB

12-31-2003 14:03:10




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I have an Allis Chalmers Model G tractor. I am trying to remove the brake drums from the axles. So far have tryed penetrating oil daily for 2 weeks, heat and pressing on axle with hydraulic press. What am I not doing that should be done to remove the brake drums? Any help would be gratefully appreciated. Thanks.




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tools

01-02-2004 07:29:10




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 Re: Pulling brake drums. in reply to AWB, 12-31-2003 14:03:10  
Hey, good news I just did this. Not necessarily an expert though...

Can't imagine a hydraulic press won't do it, so, we need to make sure everything is ABLE to move.

First, did you remove the little "bolts" that are (or were) safety wired at the ends of the axle shaft housing? They retain the entire assembly (axle shaft, bearing, bearing retainer, and therefore the brake drum as well).

Second, make sure you are holding the axle shaft housing and pressing on the axle shaft. The drums are held only with a friction fit, there aren't any secret hidden set screws on the drums anywhere (the types that have gotten me on other projects). I had to worm the entire assembly inside my hydraulic press, which was a tight fit. I had to lower the cross piece, get it in, then raise it back up, kind of a pain (cheap press, no neat little winches).

As well hidden as they are from the elements, and the tight machined fit, there shouldn't be any corrosion to cause a real problem. Might (just for kicks) clean the shaft that's exposed inboard of the brake drum. But I seem to remember that where the brake drum sits is slightly raised, so you're not removing the drum over any more shaft (at a tight fit diameter) than the drum needs. Some corrosion, dirt, whatever, shouldn't interfere with removing the drum.

Good luck, let us know how it works out.

Tools

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jdemaris

01-01-2004 12:12:15




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 Re: Pulling brake drums. in reply to AWB, 12-31-2003 14:03:10  
I'm not an expert on Gs either. Generally speaking, though, I run into lots of stuck brake drums. Usualy, they get stuck where they slip over the hub on the axle. Once on for a long time, they get rusted fast and don't "slip" anymore - unless the last person to assemble it used Never-Sieze. I often break them loose using a slide-hammer type axle puller. Such a puller is used to pull axles by fastening it to axle studs with lug nuts. However, if you hook one of the ears of the puller on the edge of the drum, and then use the slide hammer, and work your way around the drum, it will usually get it off. This is for the type of drum that, when not rusted, slides easily onto the axle raised flange (round hub into a round hole in the drum) and is held on by the wheel and lug nuts. I don't know what a G uses. I've encounted, on some old equipment, where drums have a tapered and keyed bore, and fit tight to a tapered axle shaft and are drawn on by one big nut. If so, that's a whole differnt story (kind of like what 4WD Subaru cars use now).

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Wayne

12-31-2003 19:43:32




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 Re: Pulling brake drums. in reply to AWB, 12-31-2003 14:03:10  
I'm not an expert on an AC G by any means, and to be honest I don't how your brakes are set up. Still in my experience when a drum doesn't won't come off no matter what you do, what's holding it is usually the shoe itself. Depending on the composition of the shoe I've seen them rusted to the drum, but more commonly they wear a groove around the inside of the drum and then catch on it when you try to pull it off. Like I said, I'm far from AC G expert, and may be way off base, but it may be something to look at.

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