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Forums > Active Threads > General Tractor Discussions > Mowers Field and Finish

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PTO shaft overlap required for rear mower

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charlieK
Join Date: Feb 2004
Posts: 107 kentucky
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2011-02-27          177071


how much of the 2 halves need to be together(when hooked up on level ground)

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PTO shaft overlap required for rear mower

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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
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2011-02-28          177075


This is one of those questions that has never successfully received one unanimous answer. Some folks say 6" overlap is sufficient, others say as much as 50% of the overall length. Sometimes the choice has to do with personal preference, sometimes with unusual hitch geometry. I'm towards the middle, cutting mine to a 33% overlap.

There's been nothing unusual about the geometry on the last 6 tractors I've owned, so my procedure is pretty consistent. Start on level ground, remove the PTO shaft completely, and connect the mower to the three point hitch. Measure the distance between the tractor PTO output shaft stub and the ground. Start the engine and use the hydraulics to raise the hitch. Stop at a point where the mower transmission input stub is the same distance from the ground. Measure the distance between the grooves in the two stubs. At that height, this is the shortest distance there will ever be between the two stubs. Raised further or lowered to the ground, this distance will increase. That's why the shaft has to expand and retract. Too short, and it will come apart. Too long, and it will likely bend/break something.

With that measurement recorded, pull your shaft apart into its two halves. Note that they have push buttons or bolt holes on either end. That's where they grip onto the grooves in the stubs. Position the two halves overlapping to the point where the push buttons/holes are the same distance as your earlier measurement. Ideally, you want to see half of one shaft overlap half of the other shaft. This constitutes a 33% overlap (based upon overall length). If there's more than half overlap, cut an equal amount off each shaft (and cover) to achieve that. If there's less than 33% overlap, I personally consider the shaft too short for that particular tractor/mower combination.

And remember; measure twice, cut once.

//greg// ....

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PTO shaft overlap required for rear mower

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
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2011-02-28          177087


Also depends on how much torque will be transmitted -- whether a small mower or a wide tiller. And on how much deviation from straight-and-level your operating will be. More overlap than required is better than less than needed. ....

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PTO shaft overlap required for rear mower

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charlieK
Join Date: Feb 2004
Posts: 107 kentucky
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2011-02-28          177097


thanks for the replys--my outer shaft(1/2 the total length) is 21" and i wound up w/over 9" mated on level ground---am satisified--the finish mower i bought had a little over 3" mated and i thought that's not safe!!!! PTO shafts aren't cheap--$287 plus tax at TSC ....

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PTO shaft overlap required for rear mower

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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
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2011-02-28          177102


Too much. Try AgriSupply: click below

//greg// ....


Link:   PTO shafts

 
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PTO shaft overlap required for rear mower

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
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2011-03-01          177116


"... PTO shafts aren't cheap--$287 plus tax at TSC...."

Well ya for a five footer, but I just got a replacement there for a hundred and change.

....

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PTO shaft overlap required for rear mower

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AbbasChild
Join Date: Aug 2009
Posts: 72 Western Pennsylvania
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2012-06-23          184003


HI!

I need to cut my PTO shaft for my manure spreader--when hitched to the tractor the shaft does not shorten enough to be able to slide it on to the PTO output-shaft. What is the best tool to use to cut the metal shaft (I have never cut one before)--a sawzall? hacksaw?

Would the same "30% rule" hold true for the length of the shaft for a manure spreader? I only need about 1/2 inch, but was going to take off about 2 inches.

Thanks! ....

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PTO shaft overlap required for rear mower

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2012-06-24          184009


If your metal-cutter is a hacksaw, that will do. File the cut-end true and beveled. ....

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PTO shaft overlap required for rear mower

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greg_g
Join Date: Jan 2004
Posts: 1816 Western Kentucky
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2012-06-25          184025


Any bi-metal blade will do, it's pretty soft steel. 2" may or may not be enough. The shortest the tubes compress is when the implement is raised to a point where its input stub is on a horizontal plane with the tractors PTO output stub. Above or below that horizontal plane, the tubes extend. Take your measurement at the horizontal, and then subtract another 2" to be on the safe side.

But remember, this shaft will then be cut for safe operation of the spreader. It may no longer be suitable for any of your other implements. Each of my PTO driven implements has its own dedicated PTO shaft.

//greg// ....

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PTO shaft overlap required for rear mower

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kthompson
Join Date: Oct 2005
Posts: 5219 South Carolina
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2012-06-25          184031


On manure spreader doubt this could be an issue but if the implement is such as some mowers that do allow some flip up to follow the ground you need to allow for that also. ....

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PTO shaft overlap required for rear mower

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AbbasChild
Join Date: Aug 2009
Posts: 72 Western Pennsylvania
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2012-06-25          184034


Thnks guys for the feedback. I used a sawzall and it cut with no problems--I thought it would be much harder steel.

Thanks again! ....

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