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Pto angle

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Larry806

08-23-2004 21:28:14

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Does any one know if there is any rule of thumb on drive shaft's? My after supper project now is putting a 6'finish mower behind a Super C. The orignal shaft was only 18" I moved it back to 31" but the pto is 10" higher than the gearbox. I guess if I have to I can build a jack shaft & pully

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Larry806

08-24-2004 09:36:42

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

Thank you for all the help well maybe except the comment about only being a C ( just kidding) I'm going to put it together tonight. Everything is clear down right now so if I raise the mower the angle will be a little less. I'll let you know how it works Larry

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Rod (NH)

08-24-2004 09:24:37

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

Hi Larry,

As someone else mentioned, the rule of thumb is 15 deg at each joint but that can be pushed significantly, especially for low speed, intermittent, agricultural use. By your dimensions you are at about 18 deg. You should not have a problem. As others have said, make sure the phasing is correct so you don't a cyclic rpm effect at the mower.

Rod

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Mike M

08-24-2004 06:05:52

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

You might not have to worry too much because you still aren't as steep an angle as the jacked up pick-ups used to be.

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jCarroll

08-24-2004 05:57:46

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

A non-obvious (but VERY IMPORTANT) factor is that the two U-joints be connected so that the joints are in phase. This means that the halves of the joints which "face" each other are in the same rotational position. Not 90 degrees out of phase.

On old mowers with square telescoping shafts, it was possible to insert the tractor end in two positions - 90 degrees apart. One position is in phase - the other is wrong. newer equipment has rectangular shafts so that you can only connect then in the correct position.

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TheRealRon

08-24-2004 10:30:05

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Re: Pto angle in reply to jCarroll, 08-24-2004 05:57:46

Great point! It's not just tractors either. I've worked on a few trucks where someone had ignored phasing. Feels a lot like having square tires and does serious damage. Not just to the u-joints but transmission/transfer case output shafts/bearings/seals as well.

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txblu

08-24-2004 09:21:50

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Re: Pto angle in reply to jCarroll, 08-24-2004 05:57:46

Just never ceases to amaze me what information you pick up on this site. Here it is again.

In the last couple of days I have put together at least 3 pto shafts (keep the tractor end in the shop) and lined up the RECTANGULAR shafts not thinking as to why they were deliberately (didn"t know that) built that way. And low and behold here"s the answer.

What a deal.

Mark

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txblu

08-24-2004 05:40:42

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

Worst that can happen is a couple of U joints every 10 or so years. Keep em greased. That"s what U joints are for is to transfer power in varying angles from gen to load. At worst it will vibrate from not being balanced but you can control that by finding a speed it likes. Doesn"t have to be 540.

Mark

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James in NC

08-24-2004 05:27:48

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

The angle from the mower back to the tractor is 18.8 degrees. This is from horizontal to the drive line.

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Nebraska Cowman

08-24-2004 04:41:26

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

10 inch drop in 31 inches? fairly sharp but the finnish mower don't take a lot of horsepower. you might get away with it.

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david val

08-24-2004 02:33:02

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

i don't know about pto, but if my memory servs me right, in automotive driveshafts, max angle of the driveshaft is 15 degrees from the input or driven shafts line.
david

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dhermesc

08-24-2004 08:01:35

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Re: Pto angle in reply to david val, 08-24-2004 02:33:02

Two totally differant animals, the automotive drive shaft could easily see extended periods of 2500 to 3000 RPM, with 160 to 300 HP driving it. Here we are talking about 22 HP at a maximum of 540 RPM. The less the better, but a good U joint will take more, especially with only a C driving it.

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rustyfarmall

08-23-2004 23:11:28

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Re: Pto angle in reply to Larry806, 08-23-2004 21:28:14

The only rule of thumb I know of is to be certain you maintain parallel lines from the tractor PTO to the driven gearbox. This should be done both vertically and horizontally.

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buickanddeere

08-24-2004 06:53:10

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Re: Pto angle in reply to rustyfarmall, 08-23-2004 23:11:28

There's the key point right there from Rusty farmall.

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Scott Green

08-24-2004 04:20:33

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Re: Pto angle in reply to rustyfarmall, 08-23-2004 23:11:28

Yes , the straiter , the better.

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