Re: PTO Driveshaft Length Calculations

[Richgvt]

Re: PTO Driveshaft Length Calculations

I am installing a rotary cutter on my BX23. It is a 4' tebben that came off a larger tractor. On one of the threads it said to attach the implement so that the drive shaft would be level and that would be the shortest dimension. I had about 3" to spare in this configuration. When I raised the mower up it would actually bottom out. It appears that with the shaft level it is not the shortest distance. I am now cutting 1 1/2 " off each shaft. Maybe I misunderstood but thought I would pass it on. I tried the cutter and have to say it really shakes when you ease the pto in gear. Tractor also seems kinda tippy when you hit a dip. Kinda scary. This cutter is a little bigger than what is recommended. I had to move the pins where the side arms attach to the inside of the cutters frame. I could spread the arms wide enough but the frame hit the side arms where the check chains attach. This is the first time using the 3 pt hitch. Oh, A 3 pt hitch for the B25 will fit a B23. There are some differences. You don't need the lower link pin that comes with the hitch. BX23 already has a two piece pin installed.

 

[RoyJackson]

Re: PTO Driveshaft Length Calculations

The shortest PTO shaft length depends on the geometry of the 3PH. In theory, the shortest should be as the PTO is level, but theories aren't always right. If you have a PTO driven implement you know is OK, you can eyeball or measure between the yokes to determine the at what position the shaft is shortest. I think you'll find most are shortest at full lift height.
I've only had to cut down one PTO shaft. I determined the shortest position by measuring the distance between the tractor and implement shafts (with the PTO shaft removed). BTW, I believe the correct term for the drive shaft between the tractor and implement is Cardan Shaft.

As far as the cutter vibrating a lot....that's normal. Those blades pivot and at first rotation, the cutter will be unbalanced. Once the blades pivot out, the vibration will smooth out.

As far as the "tippy", you're probably on rough, uneven ground. Also, make sure your top link is extended far enough that the tail wheel maintains contact with the ground...at least, most of the time.

 

[nap61]

Re: PTO Driveshaft Length Calculations

EverythingAttachments.com has a video on proper sizeing of pto shafts.

Norm

 

[Arcane]

Re: PTO Driveshaft Length Calculations

EverythingAttachments.com has a video on proper sizeing of pto shafts.

Norm

Couldn't find it on the website. Would you pls post a link?

 

[GreenWannabe]

Re: PTO Driveshaft Length Calculations

Couldn't find it on the website. Would you pls post a link?

Measure and Cut Tractor PTO Shaft - Everything Attachments.com

The directory to their video library is here: How To Video Demos - Implements & Attachments.

 

[Richgvt]

Re: PTO Driveshaft Length Calculations

It is a good video. Wish I saw it before I finally figured out mine. Since this is my first tractor I learned a lot watching some of the other videos. Thanks

 

[Mock1]

Re: PTO Driveshaft Length Calculations

I'm running a four foot Tebben on a GC2610TLB. I know what you mean about shutter. I leave the FEL as a counterweight. Most of the ground I have to negotiate is relatively flat, but if I see something questionable I'll crawl to
a snails pace. We went through two shear bolts on Saturday trying to clear
the unknown. I don't mind changing the bolts, but the shield sucks.
Happy mowing....

 

[Richgvt]

Re: PTO Driveshaft Length Calculations

I don't have any shields on my mower. I did hit the top of a rock and felt some debris hit me. I think it ricocheted but makes me wonder about using it without a shield in front. Those chain shields look like they would work well but I bet their pricey.

 

[Mock1]

Re: PTO Driveshaft Length Calculations

I have got rubber on mine. Chains are probably expensive, but I was looking at weight. Two times four feet at five inches of chain adds up. The rubber seems to help with any objects thrown. Ultimately, it will NOT protect all bystanders.
If any one is coming close , I will just shut it off. The rubber guards do help,
but you do have to be aware of the discharge of the cutter.Our Loved one's that really need to see how things are going tend to not heed the warnings.
Happy cutting.

 

[RoyJackson]

Re: PTO Driveshaft Length Calculations

I don't have any shields on my mower. I did hit the top of a rock and felt some debris hit me. I think it ricocheted but makes me wonder about using it without a shield in front. Those chain shields look like they would work well but I bet their pricey.

Rubber shields are a lot cheaper. You can make them yourself if you can find some old truck mudflaps or similar materiel.