Proper way to adjust pto shaft

[vtmbz]

I snapped off my pto shaft on my b7100 and now I begin to think the reason why was because I never adjusted my pto shaft to the tractor when I bought my brush hog. I drove over a log, it raised the BH and the pto snapped.

I fixed it taking advice from this site, but then realized I never gave the shaft a second thought when I bought the BH. Was it too long?


Is there a methodical way to check the length for proper operation?

[smstonypoint]

Is there a methodical way to check the length for proper operation?

Here's a video from Ted Corriher: How To Video Demos - Implements & Attachments

Steve

[gwdixon]

I snapped off my pto shaft on my b7100 and now I begin to think the reason why was because I never adjusted my pto shaft to the tractor when I bought my brush hog. I drove over a log, it raised the BH and the pto snapped.

I fixed it taking advice from this site, but then realized I never gave the shaft a second thought when I bought the BH. Was it too long?


Is there a methodical way to check the length for proper operation?

The only "adjustment" to the PTO shaft is to make it shorter so that it fits between the tractor's PTO shaft and the implement's PTO connection. A minimum of 6" overlap engagement is recommended - more is better, to a point.

Assuming that the PTO shaft could be put on while the tractor and implement were hooked up, the shaft was probably not too long. The forward motion of the PTO shaft to hook up to the tractor indicates the safety margin. Without seeing a photo of the set-up, 4" to 6" of forward movement to hook up is likely enough.

My bet is that the log you drove over jammed the stump jumper (if the implement has one) and the shear pin or slip clutch did not protect the system.

You are lucky that serious damage wasn't done to the tractor's PTO function.

[nybirdman]

If you purchased your BH used,make sure the slip clutch is working or if equipted with a shear pin that it is a shear pin and not a grade bolt.

[RoyJackson]

After reading gwdixon's post...are you sure the PTO drive shaft snapped? Or, could it be just the shear pin functioning as designed?

The only way I can see the PTO drive shaft snapping is if the log pushed the forward end of the cutter up and hit the drive shaft.

I agree with gwdixon...if it's not just the shear pin sheared, you're lucky it didn't damage the tractor's PTO stubshaft or gearing. That can be expensive.

[vtmbz]

I definately snapped the pto output shaft since I had to replace it. I guess I just didnt realize what a binding pto drive shaft will do to the output shaft.

And now I do! I guess I thought the lift arms on the 3pt had a stop on them but maybe they dont.

3pt hitch geometry is not something I understand very well.

[RoyJackson]

Oh, you snapped the tractor's PTO stub shaft?
Ouch!