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Allis Chalmers Discussion Forum

AC5040 brakes

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Author  [Modern View]

11-27-2019 15:37:36

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I have the operator's manual and a service manual for this tractor. The instructions in the service manual to adjust the brakes are confusing to me. The diagram and the picture provided are a bit different than what I see looking at the tractor. The instructions mention tightening a nut (I beleive it adjusts the internal brake bands) but also loosening it one and a half turns and then tighten a collar nut. The free play adjustment makes more sense and I can see the adjusting collar and locking nut on the brake pedals. Anyone familiar with this procedure?

I usually mount my snow plow and put on the chains Thanksgiving weekend to get ready for winter in Wisconsin. Hoped to adjust the brakes while working on the tractor.



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12-03-2019 15:24:47

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 Re: AC5040 brakes in reply to Stoughtonfarmboy, 11-27-2019 15:37:36  
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I used to live in WI, don t miss the winters! In GA now. Hopefully you can help. My 5040 is stuck in gear. Happened when I was in the process of shifting gears. Shifter fork out of alignment? Do you know how to fix?



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01-02-2020 08:54:04

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 Re: AC5040 brakes in reply to scratch67, 12-03-2019 15:24:47  
This is a reply to the fellow with the tractor stuck in gear. It happened to me a couple times. Remove the bolts holding the cover the shift lever sticks up through. Take a big screw driver and move the internals. Usually, just one "fork" to move and it will be in neutral. You will feel when they move freely. Put shift lever in neutral position and reassemble. Should work.

Mine happened when shifting between Reverse and 3rd gear while under load,


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11-28-2019 07:29:12

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 Re: AC5040 brakes in reply to Stoughtonfarmboy, 11-27-2019 15:37:36  
I donít have a whole lot of experience with the 5040, but they were made by the Long tractor company in Romania. I believe the 5050 tractor was made by Fiat.

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11-28-2019 04:19:37

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 Re: AC5040 brakes in reply to Stoughtonfarmboy, 11-27-2019 15:37:36  
I've been around very few of those Fiat tractors. I can tell you this, just tighten each side up tight enough that you can still set the parking brake. Too tight and that can't happen. I remember two nuts on each side. One is the adjusting nut and the other is a jam nut to keep the first nut from moving after you get it set where you want.

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11-28-2019 06:27:15

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 Re: AC5040 brakes in reply to DrAllis, 11-28-2019 04:19:37  
So, no screw that adjusts the internal parts? Your procedure makes some sense. Brakes are only OK when I use them. But, if I set them using parking brake lever they hold.

I will work on them later today. Wind has calmed down from yesterday.

Thank you.

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11-28-2019 07:18:14

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 Re: AC5040 brakes in reply to Stoughtonfarmboy, 11-28-2019 06:27:15  
I've got an Oliver 1365 built by Fiat. I think they're probably about the same set up. Just loosen the lock nut and tighten the one behind it. On mine,I can still feel resistance in the pedal alright,just weak brakes. Tighten that nut up a little and it'll slide the wheel again. You'd think the pedal would go to the floor when it gets out of adjustment,but for some reason mine just acts like they're worn out and need to be replaced,but that doesn't seem to be the case.

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11-28-2019 10:17:19

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 Re: AC5040 brakes in reply to rrlund, 11-28-2019 07:18:14  
rrlund: where is the lock nut? I can adjust the pedals with the nut and adjusting collar on each pedal. Left side brake skids wheel. Right side slows tractor. I opened little inspection cover on bottom of tractor. There is a cover on both sides of the tractor. I could see a large bolt. Looked to be safety wired. Is that the nut to adjust?


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11-28-2019 11:10:52

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 Re: AC5040 brakes in reply to Stoughtonfarmboy, 11-28-2019 10:17:19  
All I've ever adjusted are the ones with the collar that the linkage from the pedal hooks to. I never took any cover off to get to anything inside. Like I said,I can't figure why there's still pedal but the brakes don't work well if at all,but adjusting them right there seems to fix them. When I bought mine,I had no right brake at all,but the pedal only went down about half way before it felt like I should have a good brake. When I tightened that linkage,it worked.

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