What am I missing?

grandpa Love

Well-known Member
Got a " Bushhog" that we use on the ford 640 and the 960. 640 is better on hills ( safer) but when you raise the mower too high the shaft hits front of it ,bangs bad. 960 sits higher no such issue on it. What do I need to change ? I'm sure I'm overlooking something simple. Also could this cause the pin in orc to break ? Seems to be an issue on 640. Thanks
 
All sorts of things could break, that is not a good thing. Don't use it that way.

I assume you have the Orc on the 600, and do not have one on the 960.

That is what the difference is.

You need to trim an inch or three off both sides of the pto shaft. Trouble is you don't want it too short for the taller 960 without an Orc, it needs enough overlap to work properly. But you need it shorter then it is for the lower 600 tractor with Orc.

Paul
 
Previous owner cut an arc out of the front of my brush hog to clear the PTO shaft.

And it needs it on my NAA. Been using it for 15 years that way with out a problem.
 
It will raise about 3/4 of the way then it hits. I bent PTO on tractor few weeks ago. Sorta fell off the ol gooseneck. When mower hit ground it jambed way up and bent shaft. Got a new one in there now. Don't want to mess this one up. Had to get new over run coupler too.
 
Are you saying the pto drive shaft hits the front edge of the bush hog? Mine does that. Probably is the ORC changing the geometry. I just try to be careful when raising it up. A bolt on the quadrant lever to act as a stop will also work.
 
Does it have or could you make another set of holes higher up in the bush hog mounting plates? Maybe you could torch new holes.
 
Yep. Of course there are other
issues ,when you come off a hill
,or through a dip sometimes the
bush hog will raise on its own.
Not to annoying , until it goes to
banging.
 
Does your tractor and implement have more than one set of holes for the top link? If they do, put the top link in the lower set of holes on the tractor and the upper set of holes on the implement. This will raise the back of the implement as much as possible and thereby lower the front. If this is not an option and you can’t make another set of holes above the existing ones on the implement like the other guy advised you might want a hydraulic top link so you can shorten it at the same time as you are raising the implement.
 
careful about running without the over running clutch I do think you were just discussing a test . However Had a friends dad killed running his ford with out the clutch. Fellow was use to his bigger. newer tractors .
 
Wilson, I'm far from being a Ford expert or Ford lover, but I believe the models of tractors he is using have independent PTOs and don't continue to drive the tractor forwards like an N series tractor.
The 6" added to the PTO length not only stresses the bearings, but when he lifts the bushog the shaft is much closer to the front of the mowers frame when it is raised.
Loren
 
Middle digit "4" is 4 speed tranny and transmission driven PTO. Middle digit "6" is 5 speed transmission and 2 stage clutch.
 
Besides changing the length of the top link there are also longer and shorter toplinks. I had a three point attachment that would not work until I used a shorter toplink. Also , if there is an adjustable for height back wheel , that can be used to change angle of implement. For me , it is easier to look at it and figure it out than to read or write about it. I agree , I would not use it like that. Good luck.
 
Can you put a stop on the lift control lever that prevents you from raising the implement all the way up ? Mark
 
Ok. I'm getting more confused. To get the " bushhog" to sit level ,I adjust the top link. So a longer or shorter one ain't gonna help? On the 640 it only has one place to put top link. 960 has 3 sets of holes. 960 has a 2 stage clutch. When using PTO you gotta move the pedal. Makes it come up farther. You can stop tractor but bushhog keeps spinning. If you push it all the way down it stops too. 640 had to have orc been there drove it without. Not fun. Maybe that bushhog just ain't a good fit for the 640?
 
You'll have to shorten the top link so the mower will raise with the back higher. Won't take much adjustment for the PTO shaft to clear the front of the mower.
 
I use a piece of3/8 chain instead of top link on a 3910 solved the problem of hitting pto shaft when raising up plus gives more flexibility about backing up banks
 
His 640 Ford is only a 4 speed same as the NAA and they did not have a live PTO, Then there was the 650 that had a 5 speed but still no live PTO, you had to get up to a 660 to get the 5 speed with the live PTO. Now his bigger tractor does have the 5 speed and live PTO
 
Could you move the 3 point pins further forward on the bush hog by adding brackets to it? The hog would then be further back, behind the tractor. Make it the same distance as the ORC is long.
 
Thanks to all for the suggestions​. When this tropical storm goes away I will tinker with it and see what will work. Kevin in Central AL
 

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