Bushhog Question

Sapper55

Member
Hello,
I am using my MH44 as a working tractor with an old drag type bushhog. It works fine until I have to change direction, and then as I'm turning there is a loud "thunk, thunk, thunk," until it is straightened out and the sound smoothes out. My bushhog driveshaft is tight with no slop in each of the universal joints and no detectable looseness in the pto shaft. Any thoughts?? I appreciate this forum and all participants for any assistance.
Regards,
Sapper
 
Hello, PT,
I appreciate the input. I was thinking that The PTO was complaining, that some type of shim or thrust washer was beginning to fail. I'm pretty well versed in using my drag with my H Farmall but haven't seen or heard any complaining with it. I do notice that the pto on the 44 is about a foot higher than my H. I wonder if that is something to be concerned about.
Thanks,
Sapper
 
Hello, Gary,
I appreciate your response about turning too short. I have two limit chains on each side of the bushhog's hitch. The other ends have a hook and are adjustable so that either side of the bushhog won't strike the rear tires. Thanks again, Sapper
 
I have an old JD hog that used to do that until I aligned the hog shaft elevation more in line with the tractor shaft, made a lot less noise in turns. Also how worn is the tractor pto shaft? Is it possible you have the u-joints out of phase, esp. if the tractor end slips out easily, sometimes an issue with square pto shafts? Otherwise I would keep hoggin'.
 
The straighter the driveshaft the happier it will be. With one end being 12" higher than the other the u-joints have to run at 2 different angles when you turn, they really don't like that.
 
What I understand is that in a perfect straight line, the drive shafts drive at the same speed. On a turn, the first shaft still drives at whatever speed, but the one trailing first accelerates, a half turn, then decelerates a half turn, then accelerates a half turn, then decelerates a half turn, etc. The faster the first shaft spins, the more rapidly the secnd shaft accelerates / decelerates / etc. etc. etc. etc. It can go so fast it whap/whap/whap/whaps .
If the shafts were at 90 degreees, the trailing shaft would actually stop momentarily, then SPIN faster, then STOP, ten SPIN!! I think.
 
Agree with MF#1. Check to see if the joints are in phase. It may not be the problem, but it is so easy to check.
 
The distance from the end of the pto shaft to the center of the drawbar hole should be 14 inches(ASAE Specs). If you have any adjustment of the drawbar, this may help some. It did on our round baler, being pulled by a M4030 Kubota, especially in right turns.

Garry
 
Don't look for a zebra until you have ruled out the possibility if a horse. Do you get a huge clump of chopped grass out of the mower after the clunk, clunk? My old J-D mower does that. Could just be deck design that doesn't clear the chopped material out during a turn, so it wads up underneath and then comes out with big clunk.
 

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