CA RH brake drums
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=15301
Printed Date: 04 Feb 2025 at 6:38am
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Topic: CA RH brake drums
Posted By: DaveKamp
Subject: CA RH brake drums
Date Posted: 16 Jul 2010 at 11:24pm
Hey all-
I got a call earlier about someone looking for a brake drum for a CA... apparently one side is close to unobtanium? Charlie tells me that the LH side is same as a B/C... but RH side, being with a clutch... is not.
Is this thing available through any aftermarket manufacturers? If not, is there sufficient need to have a foundry pattern made, and a bunch cast? I've got a friend who's an out-of-work patternmaker, I'm sure that if I had a worn-out drum, I could have him make a pattern for casting, and I could machine 'em accordingly...
Gimmie some input here!
DK :-)
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Replies:
Posted By: Brian Jasper co. Ia
Date Posted: 17 Jul 2010 at 7:31am
The hand clutch IS the right side brake drum. It can be eliminated by obtaining another left side pinion shaft and drum and installing, or just swap in a complete RH axle/final drive from a C.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: Dave(inMA)
Date Posted: 17 Jul 2010 at 7:58am
The RH drum is, as Brian says, part of the hand clutch on the CA. However, the drum is a separate piece of the hand clutch and the surface can get worn. On my CA, for example, the drum surface was badly scored because the brake band was allowed to wear down to the rivets - I have about 50% of the braking power you'd expect as a result. Since this part was used only on the CA - while the LH drum was used on the B/C/CA, it's hard to find. There were about 200,000 B and C tractors built and only 39,000 CA's. So......if someone were to want to manufacture the RH drum, why not????
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WC, CA, D14, WD45
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Posted By: Chris/CT
Date Posted: 17 Jul 2010 at 8:03am
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Most with worn drums have them turned down and re-sleeved to fac. spec. Also can spray weld and turn down to spec. You would not be able to cover your cost[s] associated with reproducing that part.
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Posted By: Dave(inMA)
Date Posted: 17 Jul 2010 at 8:07am
Chris - would any machine shop be able to turn down a drum and re-sleeve it? One bit of information that I haven't located yet is the factory spec for the brake drum diameter. Maybe one of the parts guys will run a measurement for me!
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WC, CA, D14, WD45
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Posted By: Chris/CT
Date Posted: 17 Jul 2010 at 8:15am
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I would think any machine shop could do the job, others on Forum have had it done trhis way maybe they will chime in. I think you can get the Factory OD off the worn drum at the innermost area where the band does not wear it down??
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Posted By: Dave(inMA)
Date Posted: 17 Jul 2010 at 8:16am
Good suggestion, Chris. I'll try that when I have it apart next time!
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WC, CA, D14, WD45
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Posted By: DaveKamp
Date Posted: 17 Jul 2010 at 11:25am
Well, if the OD of the right and left drums are the same, one could just measure the OD of either, and estimate the maximum- I don't think there's quite that much precision to contend with.
Are there any other wear factors of the drum? Does the hub break? Can a LH hub be machined to work in a RH application?
I was posed this question without reason, but I suspect the issue isn't a matter of friction surface wear, but of some other situation.
In any event, cost to recover expenses may not be as high as expected. If I carry a foundry-ready pattern to a local foundry, my costs will only be based on what I have cast...
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Posted By: Brian Jasper co. Ia
Date Posted: 17 Jul 2010 at 12:15pm
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The brake drum part of the clutch is one half of the complete clutch if I remember correctly. It's been a good 10 years since I rebuilt mine. I wonder if something like a Speedi Sleeve could be machined to repair the damaged surface. I guess it all depends on how much could be cut off the clutch housing half. They don't have a "wear surface" that is pressed on them originally, that I do know. I just this spring decided to install the friction kit on my original bands. I usually have a back blade on the tractor and for probably 5 years now that has been my braking system. My drums are somewhat rough, but with new material, it has no problem skidding the wheels going forward now.
The left drum kind of resembles a flat belt pulley and is pressed on the pinion shaft. The clutch is supposed to be a slip fit with a woodruff key, but if it's rusty, and the upper final seal is not leaking on it, I'm told they can be a challenge to remove.
Oh, the brake lining kit and bands are the same both sides.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: Brian Jasper co. Ia
Date Posted: 17 Jul 2010 at 12:21pm
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Dave, if you plan to make any patterns and get stuff cast, I'd be interested in a D262 block...
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: Ray
Date Posted: 17 Jul 2010 at 2:22pm
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I have three CA parts tractors,may be able to come up with something. 785-353-2392
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Posted By: GregLawlerMinn
Date Posted: 17 Jul 2010 at 8:12pm
I had a machine shop machine down my right hand drum and install a sleeve on it. It was a press fit and they also spot welded the sleeve in several locations. Cost was very reasonable and the fix was very good.
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What this country needs is more unemployed politicians-and lawyers.
Currently have: 1 D14 and a D15S2.
With new owners: 2Bs,9CAs,1WD,2 D12s,5D14s,3D15S2s, 2D17SIVs,D17D,1D19D;1 Unstyled WC
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Posted By: Dave(inMA)
Date Posted: 17 Jul 2010 at 8:19pm
Sounds like a good answer, Greg.
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WC, CA, D14, WD45
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