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#1
11-28-2011, 10:51 PM
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Cadet 123 hydro speed control
I ordered up a new cam and damper plate assembly for my Cub 123 hydro, and see a few potential issues. As I understand it, gradual self accelleration/decelleration is caused by play between the cam and damper, and any play between the damper and trunion will usually result in more abrupt jerking. My tractor exhibited a little gradual self-accelleration problem, and none of the unpredictable jerking I've heard with others running original speed controls of this age.
Anyway, issues with the new parts: 1. The post which engages the cam on the 903-0194 damper plate assembly is longer than the original, such that it protrudes well thru the cam plate. I believe it will interfere with the trans tunnel, and because the tunnel is not removable on a 123, so there's not much opportunity to test fit. Has anyone else seen this on a 123? I'm not sure whether to just grind it down to match the original, or if I should be exchanging it for another damper part number. 2. More interesting on hydro theory, I think I've come up with a new fix for the worn trunion problem. Both my old damper plate and the trunion itself have a slot that is 1.210" long. I'm not sure if that's what they were when manufactured, or if they've both just worn evenly to this number, but they work wel together. The tractor exhibits none of the jerking problems exhibited by hydros with worn trunions. However, the new damper plate has a slot for the damper springs which is only 1.190" long, resulting in 0.020" play in the spring assembly. I'm guessing this is the source of the jerking so many have observed, and the reason for the recommended trunion fixes. However, it seems it would be much easier to simply file the new damper plate slot to match the worn trunion (1.210"), than to weld repair the trunion. The extension springs in the assembly easily hold in the 1.210" slot, and as already observed by using this tractor, the 0.020" difference in slot length seems to make no difference, assuming the trunion and the damper are well matched to one another. Am I missing something? 
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