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Transmission Question

T

Tom in Iowa City

Member
I am going to put a transmission into my McCormick-Deering 22-36.
This is a replacement transmission from another 22-36.
How do I check for proper gear mesh between the Bevel Pinion of the transmission and the Drive Bevel Gear (see illustration below)?
Feeler gauges?
Paint the teeth with bluing and check for rub off?
There are no specs given for this in any of the books on this tractor.
Tom


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the first thing is you will need to use the crown and pinion as a matched set. either use the pinion from original in this trans. or you need to install this crown gear in your tractor. before taking apart you need to check the pattern with bluing to see where the pattern is on the gears. then you need to set it up in the tractor and get the pattern matching. it is quite a time consuming job and can require adding or deleting shims as required. backlash should be around 0.008 to 0.012 . the pattern is more critical than backlash. best to get your self a shop manual from something a little newer and you can study up on the concept and get an idea what is happening when you add or subtract shims. even take a pic. of the pattern to refer to. you check the backlash with a dial indicator and try to get it set up with the same as before taking apart.
 
(quoted from post at 08:13:26 01/14/11) the first thing is you will need to use the crown and pinion as a matched set. either use the pinion from original in this trans. or you need to install this crown gear in your tractor. before taking apart you need to check the pattern with bluing to see where the pattern is on the gears. then you need to set it up in the tractor and get the pattern matching. it is quite a time consuming job and can require adding or deleting shims as required. backlash should be around 0.008 to 0.012 . the pattern is more critical than backlash. best to get your self a shop manual from something a little newer and you can study up on the concept and get an idea what is happening when you add or subtract shims. even take a pic. of the pattern to refer to. you check the backlash with a dial indicator and try to get it set up with the same as before taking apart.
Click to expand...

Yes, that is the ONLY way to do it. Too many folks do not realize that transmission gears that mesh together DO ACTUALLY wear into each other and become a perfect match for each other.

Yes, you can use the crown from one transmission, and mate it to the pinion from another transmission, and the two gears will mesh, but you will never get them to be a perfect match, and the result, while functional, will always be very noisy, and you will never get rid of the noise.
 
Hi Tom.

In reference to your question. What you are looking for is a good set of beveled gears, and to obtain that the manufacturer uses a master gear and a new cut gear and inspected on a rolling gear tester. The master gear would be red leaded and the new cut gear would be blued. This should give a good wear pattern for Involute, Tooth spacing, the Lead and composite errors. If not then the operator has to make adjustments to his gear cutting machine. When a gear is assembled into the casting and meshes with another it may be indicated for proper fit like .012-.015. Thses gears wear together and if one of them breaks down and needs replacing the proper way is to replace both. If not you may receive noise, uneven wear, excessive wear, etc. I am not saying it will not work and if it were me I probably would change just the bad gear and use Red Lead and Blueing to get as proper fit as possible. Hope this helps.

Bob
 
I'd get those gears cleaned up before you take it apart, check the pattern with some bluing, record the backlash and then keep the shims in order when removed, probably three stacks of shims. Then you can put it back together and you got somewhere to start, move a shim here and there to get closer.
Maybe you can google how to set up a differential and get a better idea.
 
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