4850 PTO Quit - The Combine Forum
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post #1 of 32 (permalink) Old 10-22-2018, 10:28 PM Thread Starter
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4850 PTO Quit

Was baling with the 4850 today on one of our Krone 4X4 balers when the PTO just stopped turning. No bang, no ratcheting, no slipping - it just silently quit without warning. PTO lever stayed in gear when it quit and feels perfectly normal. Hooked up a pressure gauge and the PTO pressure is right on spec (a little above actually, right where we set it). The PTO shaft at the rear spins freely by hand with the engine running and shut off but never tries to turn with the engine running.


Has anyone heard of the PTO shaft failing and twisting in two? I would think that it would make a lot of noise if it did but that is what it is looking like happened. I guess we will know in a day or two when we get ambitious and drain all the hydraulic oil out and pull the PTO shaft...


Any other ideas on what could have happened? I have always heard that 30/40/50/55/60 series Deere's had the toughest PTO's known to man...


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From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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post #2 of 32 (permalink) Old 10-22-2018, 11:11 PM
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Never seen it on a 4850 but on a 4630 I have broke about mid way threw trans housing. You should only be able to turn it about a 3rd of a turn with pto off because the pto brake only has 3 splines on it.

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post #3 of 32 (permalink) Old 10-23-2018, 08:39 AM
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I don't think you have to drain the oil, as we don't when we switch the 540 to 1000 on the 4250
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post #4 of 32 (permalink) Old 10-23-2018, 08:57 AM
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take pictures when you start working on it. very interested how it broke as a 4850 is on my short list of tractors that I want in the future. I've bent PTO shafts when lifting a 3 point mounted implement too high, but never broke one.
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post #5 of 32 (permalink) Old 10-23-2018, 04:21 PM Thread Starter
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I don't think you have to drain the oil, as we don't when we switch the 540 to 1000 on the 4250

Different setup. 4850 is 1000 RPM pto only with a single shaft that runs all the way through the transmission case.


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Never seen it on a 4850 but on a 4630 I have broke about mid way threw trans housing. You should only be able to turn it about a 3rd of a turn with pto off because the pto brake only has 3 splines on it.

Agreed on the PTO brake - PTO shaft spins freely like there is nothing but a set of tapered roller bearings holding it.


How did you break the shaft on the 4630? Did you twist it in two or get it in a bind from the implement?

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Originally Posted by Duchek View Post
Quote:
Originally Posted by IHC560 View Post
From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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post #6 of 32 (permalink) Old 10-23-2018, 04:22 PM Thread Starter
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take pictures when you start working on it. very interested how it broke as a 4850 is on my short list of tractors that I want in the future. I've bent PTO shafts when lifting a 3 point mounted implement too high, but never broke one.

Will do.

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Quote:
Originally Posted by IHC560 View Post
From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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post #7 of 32 (permalink) Old 10-23-2018, 10:26 PM
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The 48S did not have very good pto s at all. When running up to their horse power limit they were weak . Seen several 4850s running forage harvesters , including our own , have a few failures . The splines would strip out of the hub in the clutch pack ( I heard a short zing sound ) ....this is possible what has happened but it should only turn 1/3 of a turn if the pto brake is working . The seal on the clutch pack is known to blow out but you said the psi was good so that shouldn’t be the problem ......it might be a broken shaft as you are guessing ...good luck
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post #8 of 32 (permalink) Old 10-24-2018, 12:39 AM
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Not sure if the 4850 is the same but our neighbor broke the bolts off that bolt the pto drive hub in the clutch on a 4760. 5$ worth of bolts after you split the tractor
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post #9 of 32 (permalink) Old 10-24-2018, 12:54 AM
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Originally Posted by 1972RedNeck View Post
Different setup. 4850 is 1000 RPM pto only with a single shaft that runs all the way through the transmission case.





Agreed on the PTO brake - PTO shaft spins freely like there is nothing but a set of tapered roller bearings holding it.


How did you break the shaft on the 4630? Did you twist it in two or get it in a bind from the implement?
It was a customer unit shredding silage bales I just fiqure from the shock loading it finally snapped clean off.
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post #10 of 32 (permalink) Old 10-24-2018, 08:31 AM Thread Starter
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Not sure if the 4850 is the same but our neighbor broke the bolts off that bolt the pto drive hub in the clutch on a 4760. 5$ worth of bolts after you split the tractor

All large frame 15 speed powershifts are the same as far as I know.

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Originally Posted by Duchek View Post
Quote:
Originally Posted by IHC560 View Post
From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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