BRAKES IN TRACTORS

More details please:

1. Farm tractors?

2. "Dry" brakes - please explain

farm tractors are those which are used in the fields for agricultural processes and dry brakes are the brakes on the rear wheels of the farm tractors, self enegising mechanical disc brakes. I just wanna know their working and what other types of brakes are present.

edignan, I thought you were a Mind Reader, Anybody should know what Dry Breaks are???????

Typical for a lot of post's. These post's often get just as meaningless answers.

can u please explain me how dry brakes work in tractors. their exact working and from where i can get the videos of their working and some more stuff on the dry brakes in tractors!!

Guest, Dry brakes in tractors refers to brakes that are typical of most older automotive braking systems. They incorporate brake backing plates carrying typical looking brake shoes and an axel mounted brake drum clamped in place when the wheel rim is installed. Instead of a wheel cylinder for spreading the shoes you have a cam on a shaft connected to the brake peddle. The other type system typical to later model tractors are known as wet brakes, they are mounted inside of the rear axel housing and constantly run in hydraulic oil. I hope this gives you a basic understanding of wet and dry brakes, it does not refer to hydraulic or manual operations but the environment enwhich the brakes run. J.Conway

thanks a lot sir. But there is problem of stickiness in the dry brakes. why is that caused??

in swaraj tractors we use the dry brakes and the liner cotaining the asbestos material in it. the dry brakes sometimes get jammed and hence jamming the rear wheels. what is the cause of the stickiness in dry brakes and how can it be cured??

is there any problem in the spring action or sumthing like that??

Guest, I would check the brake drum inside diameter against a new drum or specifications to see if the wear is excessive. If it is and the break shoes are excessively worn the cam that spreads the brake shoes may be going past its maximum travel preventing the brake shoe springs from returning the cam to its neutral position. If you have replaced the brake shoes its possible that your shoes have a front and a rear and they are in the wrong position. A lot of brake shoes have a long and a short lining and they must be installed correctly. The only springs in the system are the 3 that pull the break shoes away from the drum and the 1 or 2 that hold the break peddle in the up position when not in use. These should be changed periodically to insure there strength. The break peddle should have grease fittings to keep it operating freely and there should be some bushings in the rest of the linkages that may need to be checked for condition, they could have contamination that would prevent the brakes from releasing. Good luck and please let us know what you find. J.Conway

Hello guest:

On very old tractors, roughly prior to 1953, a smooth drum had a flexible steel band around the outside which had an asbestos based material riveted to it. This band was anchored on the ascending side of the brake drum and tightened with a rod or cam on the other. This band almost completely encompassed the drum, and when applied tried to tighten itself through the friction developed creating a self energizing action.

On tractors made roughly from 1953 to 1965, disk brakes were used which were energised by expanding devices usually containing balls or radiused surfaces arranged in such a way that the friction between the disc and the fixed surface caused the mechanism to try to "climb the ball" increasing pressure on the friction surface thus providing a "self energizing" factor. From about 1965 on, "wet " brakes were used, using hydraulic power generated by a pump to apply braking action. There was so much power available from this source that self energization was deemed unnecessary.

THANK YOU SIR FOR THE INFORMATION.

THE BRAKES CONTAINING THE BALLS ARE USED IN OUR TRACTORS. THERE IS PROBLEM OF STICKINESS IN THE TRACTOR BRAKES. THE BRAKES ARE JAMMED AND AFTER TWO MONTHS THE BRAKES HAVE TO BE OPENED. WHAT WUD BE THE CAUSE OF THAT PROBLEM AND WHAT WOULD BE THE SOURCE FROM WHERE I WILL BE GETTING THE DETAILED KNOWLEDGE ABOUT THESE BRAKES??

Mr. Honeydhanoa:

What make if tractors do you have? Do you still have the instruction manuals for them? Sometimes it is possible to "Google" the manufacturer and read instructions. In this country manuals are sold for this purpose.

I will look through my tractor repair manuals and try to send you a picture by e-mail which may help some.

The fact that you have to disassemble the brake units every couple of months puzzles me. Is there oil and earth on the brake linings when you "fix" them? Are the brake linings considerably worn from original specifications? if so the balls may be getting slightly out of place and if oil and dirt are present the "self energizing factor may be keeping them in a locked position. Will the brakes release if the tractor is backed up slightly? If the brake linings are not excessively worn and the surfaces are clean, the problem is most likely in whatever kind of linkage is used to work the brakes. Are the tractors old and in general worn considerably? Is a small hydraulic cylinder used to work the brakes?

Where do you live? If you had a map of North America I live just South of the "great lakes".

I will try to help you however long it takes.

bill michaels

Have you tried one of the research engines as google for instance?

You can get much more detailed informations as on this forum.