Pull type rotary mower

[tomturkey]

I purchased an older pull type rotary cutter. Unfortuunately the pto shaft did not come with it. I see pictures of pull types with a single pto from the gear box to the tractor. It appears that this particular mower probably had a two piece pto shaft with carrier bearing yoke. So what are the advantages/disadvantages of a single PTO and like wise the advantages/disadvantages of a two piece pto shaft.? I purchased this to be used with my non-3-point hitch tractors, 49DC Case, 46 H Farmall. I certainly appreciate your knowledge and experience on this matter. gobble

 

[Jim.ME]

The two piece shaft can make smoother operation in turns. If the dimensions are right the center of the front shaft should center over the drawbar hitch pin, which makes the two front shaft u-joints angle equally in turns. This requires the dimension from the end of the tractor PTO to the hitch to be the same dimension as from the hitch pin to the shaft in the bracket holding the bearing for the rear shaft. JD uses Equal Angle Hitch adapters on the drawbar for on drawbar pull equipment with multi-piece PTO shafts (MoCo and square baler we have use them).

Tx Jim, please correct if I got this wrong.

 

[Ray,IN]

The two piece shaft can make smoother operation in turns. If the dimensions are right the center of the front shaft should center over the drawbar hitch pin, which makes the two front shaft u-joints angle equally in turns. This requires the dimension from the end of the tractor PTO to the hitch to be the same dimension as from the hitch pin to the shaft in the bracket holding the bearing for the rear shaft. JD uses Equal Angle Hitch adapters on the drawbar for on drawbar pull equipment with multi-piece PTO shafts (MoCo and square baler we have use them).

Tx Jim, please correct if I got this wrong.

I agree, that dimension should be 14", end of PTO stub to hitch pin hole of drawbar.

 

[Jim.ME]

I agree, that dimension should be 14", end of PTO stub to hitch pin hole of drawbar.

14" is the standard drawbar length. It may be longer with an equal angle arrangement when you adjust to get the pull pin to the center of the PTO shaft section, at least with a JD adapter.

 

[showcrop]

Two piece for drawbar pull and one for three point.

 

[ss55]

I purchased an older pull type rotary cutter. Unfortuunately the pto shaft did not come with it. I see pictures of pull types with a single pto from the gear box to the tractor. It appears that this particular mower probably had a two piece pto shaft with carrier bearing yoke. So what are the advantages/disadvantages of a single PTO and like wise the advantages/disadvantages of a two piece pto shaft.? I purchased this to be used with my non-3-point hitch tractors, 49DC Case, 46 H Farmall. I certainly appreciate your knowledge and experience on this matter. gobble

A three U-joint PTO shaft allows much tighter turns without excessive PTO vibration and wear on the implement.

N

Thread 'JD 336 Baler Driftshaft/ujoint question'

Sep 28, 2013

Have a JD 336 that knots well, however I noticed yesterday when i turn even a slight amount there is a pretty significant vibration throughout the baker. This of course only happens with the PTO in gear which leads me to a driveshaft issue because baling straight there are no issues. There are some play in the ujoints. The u joint that goes into the baler is attached to what almost looks like a clutch disk, and there is a significant amount of play and slop in that, I assume that"s be a good place to start.

JD Seller if you can offer your two cents id be very thankful. With how you helped...

• NewEnglandFarmer
• Replies: 8
• Forum: Tractor & Farm Talk

 

[Tx Jim]

14" is the standard drawbar length. It may be longer with an equal angle arrangement when you adjust to get the pull pin to the center of the PTO shaft section, at least with a JD adapter.

IIRC use of JD equal angle hitch requires factory tractor drawbar to be set at 14'' from end of tractor pto shaft to center of hole in drawbar for 540 rpm.

 

[Tx Jim]

The two piece shaft can make smoother operation in turns. If the dimensions are right the center of the front shaft should center over the drawbar hitch pin, which makes the two front shaft u-joints angle equally in turns. This requires the dimension from the end of the tractor PTO to the hitch to be the same dimension as from the hitch pin to the shaft in the bracket holding the bearing for the rear shaft. JD uses Equal Angle Hitch adapters on the drawbar for on drawbar pull equipment with multi-piece PTO shafts (MoCo and square baler we have use them).

Tx Jim, please correct if I got this wrong.

I agree

 

[Jim.ME]

IIRC use of JD equal angle hitch requires factory tractor drawbar to be set at 14'' from end of tractor pto shaft to center of hole in drawbar for 540 rpm.

Right the drawbar is set at 14” and the adapter moves the implement pin point out several more inches

 

[Texasmark]

The two piece shaft can make smoother operation in turns. If the dimensions are right the center of the front shaft should center over the drawbar hitch pin, which makes the two front shaft u-joints angle equally in turns. This requires the dimension from the end of the tractor PTO to the hitch to be the same dimension as from the hitch pin to the shaft in the bracket holding the bearing for the rear shaft. JD uses Equal Angle Hitch adapters on the drawbar for on drawbar pull equipment with multi-piece PTO shafts (MoCo and square baler we have use them).

Tx Jim, please correct if I got this wrong.

That's the reason for the "CV joint" (constant velocity) device....keep the distances equal.....every front wheel vehicle on the road is benefitting from this fact. I had a JD 1209 (sickle bar swather), my first experience with balancing the distance and it came with a drawbar extension to ensure that dimension. I could cut a field of hay and have square corners without undue vibrations with that rig....no need to have to go back and cut the X that was left at the corners the field.

 

[Jim.ME]

That's the reason for the "CV joint" (constant velocity) device....keep the distances equal.....every front wheel vehicle on the road is benefitting from this fact. I had a JD 1209 (sickle bar swather), my first experience with balancing the distance and it came with a drawbar extension to ensure that dimension. I could cut a field of hay and have square corners without undue vibrations with that rig....no need to have to go back and cut the X that was left at the corners the field.

Due to the design of a CV joint it maintains speed as it rotates when not straight compared to a u-joint and yokes with have a bump in speed every time they go by a yoke ear when not straight as there is a slight change in length as those points pass each other when rotating. The equal angle I was referring to relates to the relationship of hitch length to the length of the PTO shaft between the tractor and the first bearing mounting point in the implement in the hitch area. A multipiece shaft allows for matching those a longer one-piece shaft that goes from the tractor to the implement gear box several feet in on an implement does not.

The drawbar extension you mention is what JD calls an "equal angle hitch" as I posted. They designed it and matched their tractor end PTO shaft for implements with multi-piece drivelines to the dimensions they layout for the drawbar with their hitch adapter in place. Regular u-joints in yokes is generally the standard drive line and work with the adapter. Your 1209 apparently had the optional CY joint drive line. Even today for some implements the u-joint driveline is the base, and CV is an option, it was that way on the new MoCo we got a few years ago. I agree the CV driveline is the way to go if it is available.
.

 

[Tx Jim]

The equal angle hitch adapter when installed on a drawbar set the correct length will cause the pivot point between tractor pto & implement splined shaft that u-joint attaches to on towed implement to be identical distances from pivot point on hitches in between tractor & implement. Equal distance allows both u-joints to remain at constant rpm's which lessens vibration of telescoping pto shafts without the need of an expensive CV joint. The equal angle hitch works but some farmers didn't like having to use it.

 

[Texasmark]

The equal angle hitch adapter when installed on a drawbar set the correct length will cause the pivot point between tractor pto & implement splined shaft that u-joint attaches to on towed implement to be identical distances from pivot point on hitches in between tractor & implement. Equal distance allows both u-joints to remain at constant rpm's which lessens vibration of telescoping pto shafts without the need of an expensive CV joint. The equal angle hitch works but some farmers didn't like having to use it.

I can't imagine that other than they were too lazy to install it when they used their cutter or baler. Considering the reduction in equipment stress and the fact that you can make nice cuts without having to go back, I can't support their reasoning. Even if due to laziness, not having to buy and replace equipment parts and not having to do the X would be incentive enough for them to install it.....one would think!!!!!!!

 

[Tx Jim]

I witnessed more than once when I was employed at JD dealership for 21 yrs during the introductory years of the Equal Angle hitch of farmers electing to attach balers & hay cutters without utilizing the EA hitch extension.

 

[Texasmark]

I witnessed more than once when I was employed at JD dealership for 21 yrs during the introductory years of the Equal Angle hitch of farmers electing to attach balers & hay cutters without utilizing the EA hitch extension.

As you surely know, it depends on the lengths of the shaft and drawbar to PTO output. Or they may have made the turn and let their equipment just vibrate, or just preferred to come back and whack the X. I chose not to do that.