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Bevel Gear Box Info wanted


SmilinSam

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How much backlash(play) should there be amongst the gears when properly reassembled? And how do you accurately measure it? Thanks, Sam
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I just priced new parts for one of mine, asked the guy the same question, he told me the output shaft with the pulleys on should have .004 - .006 of endplay. The way he said to check it is to put an indicator against the PTO end of this shaft, something to rotate the shaft (visegrip,pulley, etc.)back & forth. You must also keep the input shaft from turning. By doing this, the gears will push and pull the output shaft to allow you to get an accurate measurement of the endplay you have. Hope this helps. PeppyDan P.S. I havn't tried it yet so I hope it works as well as he says it does!!!
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I put this one back together and in the frame with only the slightest amount of play in the gears. It has less than some of the other tractors I have and work hard. That was my best guess at being the right amount. Thought I'd ask before I reassemble the other 3 I have to do.. Thanks, Sam
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DLC, I assume you are talking about measuring the movement of one shaft aganst the other. The one I just fixed has about 1/16" of turn or less. Most of my other good units in the tractors I'm using have about 1/8" or less . The ones I've torn down had more than 1/4". So in your book, I guess I'm standing pretty good then??.. Thanks all--------Sam
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As long as there is no whine when running it can have darn near no play in it.In due time it'll loosen up.When buying a used unit I look for betw 1/8"-1/4" no MORE than that!
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Incredibly, my manual is silent on that subject. Just took a “read” down memory lane, and looked at some of my first posts, because I thought I had asked the same question myself. I couldn’t find anything. Perhaps I didn’t. Anyway, I’ve only overhauled one BGB in my own tractor, so I’m no expert. But, I WORK the tractor almost every day and the BGB hasn’t crapped out in over a year (old timers say they’re good for 20, so I’m 5% there). What I did was add shims until I had just a slight backlash. Since I didn’t have any specs, I didn’t bother using a dial micrometer. If I had to guess, I’d say the backlash was between .005”-.010”. Understanding that the BGB should be installed before backlash can be adjusted, I set up a jig in my press to set the backlash, and just doubled checked it during and after installation. Hope you get a better answer than this.
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