JD 4400 PTO Problem: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 4400 PTO Problem: John Deere Review -- John Deere Tractors Discussion Forum

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 08-07-2001, 17:17 Post: 30752
JD Brian



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 JD 4400 PTO Problem

I have a JD 4400 HST that I connect to a Bearcat PTO Chipper. When chipping is complete I reduce the tractor rpm, wait 2 minutes, then disengage the PTO (per instruction from dealer). My problem is that the PTO does not "free wheel" when disengaged. The PTO stops immediately and causes the chipper to come to a screeching halt. The JD dealer assumes that the PTO break is being applied upon disengagement, but does not know why.Any thoughts would be appreciated.






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 08-07-2001, 20:50 Post: 30756
Chris in IN



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 JD 4400 PTO Problem

The PTO on mine does the same thing. This is what the brake on the pto is for.






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 08-07-2001, 22:27 Post: 30757
DanaT



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 JD 4400 PTO Problem

I have a 4300. On mine there is 3 postions for the PTO. all the way forward pto engaged, middle detent is pto off but free wheeling (depends on how far the lever is pulled back) the closer you get to the last detent the brake will stop the pto. all the way back (last detent) pto is locked in stoped position.
The middle detent, mover the lever very slowly and you should be able to hear you pto driven machince slow down. I hope I helped you guys, at least this is how it works on mine.






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 08-08-2001, 01:47 Post: 30763
turfman



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 JD 4400 PTO Problem

there is a chance that you are doing some serious damage to your tractor. There is a PTO brake on our machines......the flywheel in a chipper is very heavy. they make a clutch device that mounts on the shaft it will allow the flywheeel to spin down without tearing out the clutch. I will find out the name of the thing for you and try to post it tomorrow. I know it works because a buddy of mine just got one on his JD4300. I will ask him.






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 08-08-2001, 06:48 Post: 30764
Rob Munach



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 JD 4400 PTO Problem

I guess JD is simply asking for the transmissions on these machines to get broken by installing a PTO brake. I can't even imagine the stress it must put on the machine to instantly stop a chipper flywheel or a bushog for that matter.






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 08-08-2001, 08:02 Post: 30773
TomG

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 JD 4400 PTO Problem

I think 'over-running' clutches are built in to PTO drives on most modern tractors. An over-running clutch allows the PTO shaft to turn faster than the PRO drive. Without an over-running clutch, the inertia from a heavy rotary cutter can still drive a tractor forward even when the transmission clutch is disengaged. Tractors without over-running clutches, such as Ford 8N's, have been pushed into things or over banks. Many people who have older tractors install an external over-running clutch, but such things aren't necessary on most newer tractors. I don't have a PTO break, but I imagine the design is such that the brake can't be engaged while the drive also is engaged. I do imagine that a brake would wear out quickly using it for heavy stopping of a chipper or cutter. It's probably better to let things spin down most times, and then apply the brake to make sure an implement has fully stopped.






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 08-08-2001, 14:58 Post: 30790
Rob Munach



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 JD 4400 PTO Problem

Tom G.
It is interesting that you called it a PTO "break" as that is exactly what it will do sometime in the future. I believe only modern tractors without live PTO's have the overrunning clutch. On my 790, if I cut the engine while in gear, clutch out, the PTO engaged and the bushog spinning, the bushog will push the tractor. As such, I doubt I have an overrunning clutch, but I do have live PTO.






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 08-09-2001, 07:52 Post: 30805
TomG

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 JD 4400 PTO Problem

Ops: Break the brake. Too much reliance on the spell checker, but the usage is ironic in this context. There always seems to be some confusion with the terms live and independent PTO. I'm not sure I've entirely got them clear. I think you're right that live PTO (meaning if TX clutch can be disengaged without stopping the PTO) largely eliminates the need for PTO over-running clutches. Live PTO on gear tractors generally means having a two-stage clutch. Transmission driven PTO usually aren't considered 'live' and do have potential for the PTO shaft to 'back-feed' the TX when the clutch is disengaged. I guess what I meant is that most modern transmission driven PTO's have a built-in over-running clutch. I think that gear tractors now generally have live PTO, so in that sense most modern gear tractors donít have an over-running clutch. There were two transmissions available for my mid-80's Ford 1710. The non-synchromesh TX used a TX driven PTO and had an internal over-running clutch, while the synchromesh TX used a live PTO and didn't have the clutch. I guess that if a tractor doesn't have one or the other design, the alternatives are to get an external clutch or shift to neutral when stopping. One or the other does sound like a pretty good idea. Of course, a PTO brake isnít going to do much if an external over-running clutch is mounted. I still canít see much need for a PTO brake, but then Iím always open to education. Dang terminology! I think an older version of Ďlive PTOí meant whether the hydraulics worked without the PTO engaged.






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 08-09-2001, 15:22 Post: 30820
Stan in Calif



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 JD 4400 PTO Problem

Tom-
I don't have a need for a pto brake, either. I think the manufacturer is the one who benefits the most- maybe it will keep him out of court.
The topic of pto brake recently came up over at the other place, and it went quite differently- very interesting.






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 08-10-2001, 07:54 Post: 30839
Ken Butner



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 JD 4400 PTO Problem

Guys, I agree with Dana Trumpp. I have a 4300 and the PTO lever has three positions (Run-Neutral-Brake). When I am shutting down a PTO driven implement, I always reduce my engine to an idle, wait a couple seconds, then I move my PTO lever to the MIDDLE POSITION. I allow the implement to coast to a stop. Then and ONLY then do I pull the PTO lever all the way back to the brake postion. Folks, they designed the tractor so you can stop an implement slowly before slamming on the pto brake so that nothing would BREAK! -Ken






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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