Posted by Janicholson on January 06, 2013 at 09:16:51 from (74.60.94.18):
In Reply to: Brakes on SMTA posted by Ellis Kinney on January 06, 2013 at 08:53:24:
Check this potential solution. Total internal clearance needs to be in the .030 to .060" range for good operation. As the brakes wear, the surfaces of the housing, the expander,and the flat surface of the pinion carrier all wear at the same time the friction disks wear. Because they look good, they are assumed to be in spec. If the disks, expander, pinion carrier plate, and housing are a loose stack, the balls and springs and particularly the linkage to the expander from the pull rod going to the pedal spring will be at a bad angle for correct operation. The application pressure becomes higher, the disks lock easier, and they become inconsistent. The measurement of the stack is pretty easy in that the disks and expander are one thickness when stacked up on the bench, and the housing is another depth to where it hits the tractor"s carrier bearing plate. The dimensions above, and clean shiny balls with dry lubricant (I like PTFE spray that drys to powder) make good brakes. Machining the housing mating surface to get the dimension is a pretty simple machine shop task. Best of luck with it. Jim
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