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Backlash

C

CNKS

Well-known Member
I disassembled my Super A transmission to replace the bearings. I need to set the backlash of the ring and pinion. With the countershaft and differential installed it appears next to impossible to measure the .005-.007 required backlash because the housing, etc is in the way and I can't see or feel what I am doing -- the only possibility I see is to take the side and pinion gears out of the differential (really don't want to), then perhaps I can get the ring and pinion in the correct position to measure -- perhaps not. There seems to be excess play, as it is easy to feel a "click" as I begin to turn the gears. Any suggestions?
 
Put a dial indicator on the ring gear set so that the plunger is taangent to the direction of rotation (like a string unwinding off of a spool).
It should be on a bolt head, or other surface to allow a clean push.
Hold the pinion still, and measure the backlash by moving the ring gear until it touches the tooth on the pinionboth forward (drive side) and reverse side of a tooth. Jim
 
Those little tractors are difficult to get a good reading off due to their location. That being said though, I would sure set it back with the same shims on the pinion and diff if at all possible an even then you will be on a slightly different spot on the gear due to the looseness that develops in bearings as they wore. It is a science to set them gears using prussian blue or other markers that not very many people can do well, including me.
 
I think I have the shims like they were, but due to the looseness I'm not sure as it's been several months since I disassembled -- I may have to reverse them -- thanks.
 
I probably should get a dial indicator, but I am not sure I can get it positioned correctly because I don't have good access to the gears. There is simply too much in the way.
 
You can also use the pinion to assess the backlash. The countershaft drives the pinion directly, if I remember correctly, if you measure the movement of a gear on the shaft that is approximately the same radial distance from the CenterLine of the shaft as the pinion teeth, it will measure the backlash precisely. Jim
 
CNKS Whenever I take as used ring and pinion apart, I always check backlash before dissambly. If you put them back together to factory specs it will surely be noisy. Just my experiance. Bernie Steffen
 
Yes the pinion gear on the end of the countershaft drives the ring gear. The book says to hold the pinion steady and measure the gap between the pinion and ring gear teeth. The trans gears are too big, the closest is 4th. I may remove the 4 gears next to the ring gear, then I can see the ring/pinion easily, but due to the distance it will be difficult to measure. The biggest problem is that to change shims, I have to remove the differential. There is a press-fit bearing on each side that the bearing cages must come off of. No way to pull them, "gently" prying them out is the only way. Then if it still needs adjustment, I have to do it again. I'm probably going to switch to a shim that will get it close and hope it works.
 
I didn't do that, but again there is no easy way to measure it on the Super A. Is it noisier if too tight or too loose? I would guess too tight?
 
Come on... those little tractors are so easy to do. You need a dial indicator. Lock the counter shaft so it wont move and measure the backlash. Pretty simple. good luck
 
Not necessarily easy -- I can't get to anything. Size doesn't have much to do with it.
 
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