MYSTERY CLATTERING NOISE IN TRANSMISSION SOLVED!!--)))))TO FIND OUT CLICK HERE(((((
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Posted by Ken McWilliams on October 02, 1998 at 11:59:02:
Many thanks to all for the many suggestions as where to look and what might be the cause. As you may recall, my description of the clattering noise in my Ford 9N transmission "WAS" like this: When the engine power was applied, the usual and expected noises emanated from the transmission case in all 3
forward speeds and reverse. However, when the gas was let off or the engine was holding back the tractor when going down a grade, a loud clattering would occur in all 3 forward speeds and in reverse.
When I first tore the transmission apart, I found the main shaft to be very loose and actually it could be shaken back and forth by hand. Upon this observation and subsequent tightening of the tapered roller bearings by changing shim thicknesses to give the proper pre-load on the bearings, I thought I had solved an ordinary loose gear/backlash problem in which the gears were rattling when the load was taken off the transmission. Consequently, I rejoined the front and back halves of the tractor and reinstalled all the items removed, thinking the mission was accomplished until the first test drive- the CLATTER was still there! Two more "break aparts" of the tractor resulted after the first failed diagnosis and first non-fix of the problem. Yesterday (Thursday, 10/1), I tore the transmission apart for the third time and determined to find the source of this frustrating problem. Concentrating on the input shaft and front gear of the counter shaft, because this is the only area that would have the same gears engaged in all 3 forward speeds and reverse, I began a very close inspection of bearings, teeth, gear geometry etc. I was almost ready to give up in frustration again when I noticed that something in the past had been pinched between the gears and slightly dented the top of a tooth. Closer inspection revealed a slight bulge on the back (or non-power side) of a tooth on the input shaft gear. At first, I thought this was too small and inconsequential to matter, but, on the other hand, I was not going to leave any stone unturned. I placed the input shaft on a table, sat on a chair and began the slow, arduous task of stoning the bulge on the back side of the tooth with a stone. Two hours later, and using a black marker (poor man's dykem) on the tooth as a "witness," I had the surface to where I thought it would be satisfactory to reinstall. This morning I arose early and chipper ready to reassemble the tractor and not having to go to work because I have no work to go to anymore because my employer of the past 15 years deemed it not necessary to keep me nor 58 of my senior coworkers. I reassembled the tractor and took it for a test drive. The outcome was euphoric- no clatter! Apparently, the bulge on the back side of that tooth only contacted the opposing gear's tooth when the tractor was decelerating. When that tooth came around and contacted the opposing gear's tooth, the bulge would momentarily bind and make the opposing tooth "pop" over the bulge and accelerate the tooth and entire gear's mass in the opposite direction which took up the slack in the opposite direction causing a hammering effect and resulting with a CLATTER only when the tractor was decelerating. IT'S A BEAUTIFUL DAY IN THE NEIGHBORHOOD, A BEAUTIFUL DAY IN THE NEIGHBORHOOD.......CAN YOU SAY: "CLATTER," BOYS AND GIRLS ---Mr. Rogers. Ken McWilliams
euphoric in Dayton,
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