PTO shaft engagement
- Thread starter jezorek
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bjcsc
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jezorek said:
Assuming by "engagement" you are are referring to the overlap between the two halves, most of the shaft manufacturers spec 6"...
Jimmyp5
Silver Member
Agree, 6 inches seems to be the suggested overlap. The brushhog instructions are the best I have seen on how to cut and overlap etc...
I just rebuilt a FL850 tiller and installed it on my BX 24, my overlap is only 4 inches. The short 3 point hitch on the BX 24 draws it tiller in close. Even to get the 4 inches I had to make some adjustments. I just have to keep in mind that I will not get a 6 inch bite when tilling, just means multiable passes
(good thing I am retired). No big deal, knew that with a BX 24 is a small tractor so things take longer. The FL850 was designed for a larger tractor, but the BX 24 handles it well.
I just rebuilt a FL850 tiller and installed it on my BX 24, my overlap is only 4 inches. The short 3 point hitch on the BX 24 draws it tiller in close. Even to get the 4 inches I had to make some adjustments. I just have to keep in mind that I will not get a 6 inch bite when tilling, just means multiable passes
(good thing I am retired). No big deal, knew that with a BX 24 is a small tractor so things take longer. The FL850 was designed for a larger tractor, but the BX 24 handles it well. 
greg_g
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Ideally you want to cut your shafts so that there's at least an inch of collapsable length left at the shortest point of travel - AND - no less than 6" of overlap left at the longest point of travel.jezorek said:
//greg//
For shafts that are too short, I bought an overrun (over riding) clutch... which extends the pto shaft 6 3/4" and lets the impliment run faster than the engine. For the tiller, if you add a slip clutch, it adds 7" to the pto length and gives you added protection if you hit a big rock or root.
OVER RIDING CLUTCH - Agri Supply
SLIP CLUTCH W/1-3/8X6 MALE X 1-3/8X6 - Agri Supply
OVER RIDING CLUTCH - Agri Supply
SLIP CLUTCH W/1-3/8X6 MALE X 1-3/8X6 - Agri Supply
greg_g
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Whereas an ORC will secondarily serve to compensate for a short PTO shaft, it's an unnecessary expense - and one extra moving part to break. More appropriate to the task is the simple PTO adapter. Same catalog, different part number(s):teg said:
Agri Supply - Where we have Something for Everyone for your Farm Shop & Home
//greg//
Highbeam
Super Member
I just extended my PTO shaft last night that had been cut to a custom tractor and was too short. It was a very short shaft to start with and I only have about 2 inches of engagement.
Rather than use the adapter wouldn't it be wise to just order a new PTO shaft? That is, if the shaft is to be used for a long time?
My application is one of those crazy unicorn log splitters so not a lot of torque is being transmitted.
Rather than use the adapter wouldn't it be wise to just order a new PTO shaft? That is, if the shaft is to be used for a long time?
My application is one of those crazy unicorn log splitters so not a lot of torque is being transmitted.
Soundguy
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greg_g said:
Good point about more parts to wear, if the ORC properties are not needed.
I can think of one situation where the ORC may not be needed.. but might be usefull.. like in a situation with a large flywheel load on the pto, where you might want to save your pto brake.. IE.. a large mower or a chipper.. with an ORC.. it could spin down instead of havinghe pto brake grind it down to a stop.. etc..
soundguy
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jezorek said:
Here is the hookup to attach my rototiller to the Kubota B7510HST
The overlap on the pto shaft sections is not more than 5 inches. It works fine.
Had to cut a shaft that I bought at TSC to get it to fit between the tractor and the slip clutch (the tiller doesn't have shear bolts, hence the slip clutch).
Don't need an overruning clutch since this is an HST tractor.
Needed to add that pto shaft extender onto the tiller to keep the slip clutch from rubbing on the tiller sheet metal.
This made the drive train too long for the 26" lower arms that are standard on the 7510. Had to use the 35" arms from my 1964 MF-135 diesel to get enough room to handle all that drive train stuff.