Posted by Dave jensen on Sunday, March 23, 2003 at 2:35AM :
In Reply to: Re: PTO spacer plate posted by Dave Speed on Sunday, March 23, 2003 at 1:18AM :
Hope this is more helpful than misleading. I'm no mechanic, but for what it's worth: I have seen PTO units on Dodges and IHCs that were identical except for a larger gear. The spacers I have seen used in this case have been aluminum and were just the right thickness, about 3/16s as I remember, to make up for the difference in gear size. I think it would have been impossible to bolt up the PTO unit with the larger gear without using the spacer because the gears would have bottomed out on each other with a gap remaining around the PTO and mounting area. The idea with the shims is you want the PTO unit to fit so the gears meet sufficiently but not so tight they bottom out. When I changed PTOs on my military IHC, it took a couple of times to get it right. I used white lithium grease on the pto gear as marker, to see how the gears were meshing when the pto was tightened. I don't know if you really need to do this, but it made me feel important. My '62 manual says to set the pto unit in place with no shims and measure with a feeler gauge how much space you have between the pto and mounting area. You can then add shim/gaskets of that thickness. As you tighten the PTO unit on, watch that you don't loose the necessary clearance due to gasket compression. Specs are: .005 to .012 backlash. It also says to put tranny in neutral, engage pto, and rotate pto drive shaft by hand before starting engine to make sure nothing's sloppy or binding up. Then you run the pto with engine power to make sure everything's ok before you hook up the u-joint shaft to whatever you're powering.
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