When to replace PTO shaft -Baler

farmallboy15 · Jul 1, 2021

When do you guys consider a PTO shaft worn out and ready
for replacement? I have a NH 273 square baler that is due for
some bushings in the front driveline. The driveshaft also has
about 1/8 of slop (pretty noticeable) at half extension. This is
currently a square bar type shaft and is fairly noisy in turns. Is
it it time for replacement of keep milking it along?

Matt in Oz · Jul 1, 2021

Got a NH 417. This hay season gone the front short shaft spun inside the tube while baling so was forced to replace it. This had already been changed from the rectangular original NH setup to the more generic triangular PTO tubing. If you don't want break downs do it in the off season and do the universal joints and replace the guards. I am good at spending your money, just depends on how reliable you want your baler? I went to replace the NH rectangular shaft on a 1038 stackliner and couldn't get the rectangular tubing so it got changed to the triangular type.

casecollectorsc · Jul 1, 2021

Are your two yokes line up on the front and rear of the pto shaft? Mis-alignment will cause rattling in a turn more so than a little slop in the two pieces.

showcrop · Jul 2, 2021

Look up timing of U-joints. The noise could be due to out of time.

farmallboy15 · Jul 2, 2021

I do have the U Joints timed correctly. How did you go about converting it to the triangular tubing? I believe I'm limited to the PTO series of the rear yoke attached to the baler.

paul · Jul 2, 2021

Ive found it hard to wear out an original pto shaft unless you physically harm it. The knuckles need new crosses every now and then that is where the looseness seems to be?

Those triangle ones I have wore down, but the old square ones last and last.

Paul

Tx Jim · Jul 2, 2021

I've seen square/rectangular telescoping pto shafts wear sufficiently to allow opposing u-joints to get out of phase(time).

fixerupper · Jul 2, 2021

The 1/8" play puts the shaft out of balance. An out of balance shaft puts more stress on the yokes and supporting shaft bearings. at 1/8" sideways play the shaft has 1/4" slop as it spins. At 540 or less RPM's the out of balance won't cause wear as fast as it would on a 1000 RPM shaft. You should be good to go for awhile depending how good the yokes are but maybe you should keep an eye out for a replacement shaft to have handy.

farmallboy15 · Jul 2, 2021

I think this is probably the best explanation for what's going on. I'll throw a new shaft on as well with
these bushings to take up the slop.

buickanddeere · Jul 2, 2021

Looks like a class 4 shaft . A class 6 is heavier .

Fritz Maurer · Jul 2, 2021

A torch , a welder, and the male and female telescope of your choice.

When to replace PTO shaft -Baler

farmallboy15

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Matt in Oz

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casecollectorsc

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showcrop

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farmallboy15

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paul

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Tx Jim

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fixerupper

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