Farmall Super H brakes

Anonymous-0 · Jan 15, 2011

I got a 54 Farmall Super H. However, I cannot seem to kepp good breaks on the tractor. I bought brand new discs over the summer but they do not last. In fact I may have brakes for about a week and then I lose them. I continually have to take them apart and scuff the disks back up because they glaze over so quickly. I do not use this tractor very often either. Is there another kind of disc they make that would last longer?

Stuart · Jan 15, 2011

Take all the steel brake surfaces off the tractor and sandblast them, dont touch the fiber disks.

Janicholson · Jan 15, 2011

The measurement from the mating surface of the housing casting (where it attaches to the tractor) to friction surface down in its depths is important.
The stack of the inner disk, the outer disk, and the expander (when placed all together with the expander fully collapsed) is also measured. The purpose is to measure the total difference between the tractor friction surface and the housing friction surface then subtract the thickness of the stack. The amount of clearance should be about .050". If it is dramatically more than this the linkages will need to pull so far that they loose effective angle. The gap increases when the tractor surface the expander surface, and the housing surface wear during use.
To reduce excessive clearance, the housing is machined to make this wear disappear, returning it to near new condition. Readjustment of the pull rods will be needed. Jim

GordoSD · Jan 15, 2011

As stated if you didn't have the brake drum surfaced planed it likely won't work very well.I'm not sure where Jim got the .050 spec but that seems pretty close. I use the KISS method and just plane off .100.
Your discs are glazing because they aren't being pushed together hard enough and are slipping even with extreme pressure on the pedal.
Let us know how they work after the planing.
Gordo

Anonymous-0 · Jan 15, 2011

Never had any trouble with the old drum and band brakes,but the disc have been nothing but trouble. Good luck

pete 23 · Jan 15, 2011

Good advice on all counts. Be doubly sure to polish those machined surfaces around the outer diameter of the actuators and inside the drums. I always use a light coat of lube on those and on the ball grooves also but that is my way. That actuator has to spread out to brake so it needs to move free outward over those surfaces, and don't overlook the splines on shaft as well.

Janicholson · Jan 16, 2011

The .050" came from experience. I figure it needs clearance at all 4 friction surfaces, so I gave it a little more than .010 each. This works, I have never seen a specification. The angle of pull on the short links going from the plates to the pull rod is very important small changes make large pressure differences. With wear on the metal pieces this .050" can become more like .175". The plates then need to move so far that the geometry is wrong, even with new plates. Jim

Farmall Super H brakes

Anonymous-0

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Stuart

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Janicholson

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GordoSD

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Anonymous-0

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pete 23

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Janicholson

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