Super C disk brakes

BoonvilleKid · Apr 20, 2012

left brake now starting to grab and hold, almost to the point of lockup. Cannot gently apply a small amount, it's either all or nothing. Took disk housing apart. See nothing unusual, but since I don't know what I doing I wouldn't recognize the unusual. Disk pads are thin, maybe 1/32" to 1/16" left. All steel surfaces are shiny, no rust. What could be causing this grabbing and hold? I never removed springs between the two, steel plates to see the condition inside. Is the insides of the steel plates suppose to be lubricated?

mkirsch · Apr 20, 2012

Probably the thin disks... Its causing the actuator to move too far.

New disks will help for a while. Sometimes you need to get the drum lip machined down a few thousandths if the actuators are worn badly enough.

Janicholson · Apr 20, 2012

The balls and ramps are running out of ramp from thin discs and wear surfaces. New friction discs are in order. When stacked up with the expander, the stack height should be .040" to .060" thinner than the space from surface to surface inside the housing to the tractor trans wear surface.
Clean and shiny balls and ramp grooves with a touch of PTFE (triflow) based lube on the ramps.
Jim

LMack · Apr 20, 2012

These disk are supposed to be dry and free of oil. If the oil seal is leaking and the disk and friction surfaces are oily, it will cause the breaks to grab. First try using regular break cleaner to remove oil if you see any and that should solve the grabbing problem. You then have to find the source of the oil and get it stopped. It could be water in the trans/rear end. Check the oil level in the case by removing the plug under the operator platform on the rear right. If it is high try removing the main drain at the bottom and drain any water in the case. When oil comes out replace the plug. I would almost bet you have water in the trans/rear end. It may also be a bad oil seal. Enjoy!

BoonvilleKid · Apr 21, 2012

I did not take the expander assembly apart as I didn't know if I could ever get it back together due to those springs. I will take it apart now.
I assume the balls wear out before the ramps. Is there any IH minimum diameter on the balls?

Janicholson · Apr 21, 2012

Just roundness. Clean and roll them if they roll straight on a level surface they should be OK. Jim

BoonvilleKid · Apr 21, 2012

With all of your help and suggestions, I think I have found the problem. There was no leakage from trans. into the housing, which would also cause the condition. But, when I took the actuator apart I found the ball bearings to have a light coat of surface rust on them. The ramps were also lightly rusted. This condition, plus the thin disks was probably the cause of the brakes grabbing. I'll replace all disk pads, remove the rust from the ramps, remove the ball rust by placing them in a coin cleaner roller machine repeat that operation on the right side brake & the ole SC will be good for another 50-years.

Janicholson · Apr 21, 2012

You got it. If the housing and tractor surface wear is greater than the spec I gave, the angle of motion placed on the two pull links to the plates from the center pull pivot becomes less mechanically correct, so checking that aspect with new disks can make a big difference. Jim

LMack · Apr 21, 2012

I am glad you found your problem and have it solved. I did have water in my rear end and there was leakage at all the seals including the break shaft seals. Once I changed the oil in the transmission and lowered the oil level to the proper depth the seal leaking has stopped or at least slowed. I had to clean the break disk and surfaces to stop the grabbing. I may face having to replace the seals at some point.

BoonvilleKid · Apr 22, 2012

I'm thinking the trans. did have water in it at an earlier time. I have not owned this tractor but a few months. One of the first things I did was to pull the drain plug and check for water. None. The oil looked to be new. This means to me that at an earlier time it did have water in the trans. and it got drained and the fluid replaced. Maybe that is what caused the rust, as there is a slight leakage thru the seals.

BoonvilleKid · Apr 22, 2012

Can any one give a reason for the "slot" in the splined axle (brake pedal shaft) ? The brake housing has a removable cap or plug, which would give access to that slot. But, what was the purpose of the access to that slot?

Mark Peters · Apr 22, 2012

(quoted from post at 11:21:37 04/22/12) Can any one give a reason for the "slot" in the splined axle (brake pedal shaft) ? The brake housing has a removable cap or plug, which would give access to that slot. But, what was the purpose of the access to that slot?

Drive gears for front mounted side dressers/ corn planters mounted in them slots.

Super C disk brakes

BoonvilleKid

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mkirsch

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Janicholson

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LMack

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BoonvilleKid

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Janicholson

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BoonvilleKid

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Janicholson

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LMack

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BoonvilleKid

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BoonvilleKid

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Mark Peters

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