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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Are implement outputs supposed to be pressurized?

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Farmer in the D

08-24-2003 07:21:19




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My 1850D dual outputs are pressurized all the time. That is, when the tractor is running I can't plug in because there is too much pressure at the coupling. I need to turn the tractor off to connect or disconnect. I also have to shut the tractor down to attach a shaft to the PTO as well. Is this a safety on these or am I missing something?




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Sam M

08-25-2003 06:47:34




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 Re: Are implement outputs supposed to be pressuriz in reply to Farmer in the Dells (WI), 08-24-2003 07:21:19  
On the turning pto shaft , my 1850 does the same thing . BA Star had a post on this site about three or four weeks ago on properly adjusting the pto clutch and/or rebuilding the pto clutch to prevent this which included specs on the proper distances between the clutch plates . There is a brake on the pto shaft that is activated by pushing the pto engagement lever as far back toward the back of the tractor as possible . However , I would not trust this brake to hold the pto shaft while hooking up an implement and I always turn my tractors off when hooking up pto implements . I know a man who got his leg ripped off at the knee trying to step over a rotating pto shaft so I have always been afraid of the pto shaft starting up with my hands on it while trying to hook up an implement .

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Larry from MD

08-24-2003 11:16:00




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 Re: Are implement outputs supposed to be pressuriz in reply to Farmer in the Dells (WI), 08-24-2003 07:21:19  
All of my olivers have some preasure on the outlets most of them can be connected anyway as the preasure is low.I have one that is way to high.Thease tractors can have a restrictor inside that puts back preasure on the whole system.The manuels say to remove them and replace with a pipe that puts the oil to the bottem of the resivor.One of my tractors still has the restrictor in it and thats the one with high preasure on the outlets.

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J. Schwiebert

08-24-2003 13:13:21




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 Re: Re: Are implement outputs supposed to be press in reply to Larry from MD, 08-24-2003 11:16:00  
Larry has that pretty well in a nutshell. One other thing, the Olivers other than the 55-550 series do not have selective fit spools. They use an interlock which is nothing more than a double pilot operated check valve.This means it take pressure to unseat the ball and let the pressure away (when set up for double acting cylinders) Safety wise this is great as you need to have an operator to let the load down. For some of us over 40 remember when Ford had an accumlator. I think it was gone because somebody could get hurt.with that system. Now you have them for shock loads which is a whole new ball game so to speak.

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Dean Barker

08-24-2003 10:31:14




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 Re: Are implement outputs supposed to be pressuriz in reply to Farmer in the Dells (WI), 08-24-2003 07:21:19  
I agree with Ollie on the pto, however on a tractor with an open center system, there should be very little pressure in the whole system when none of the functions are being used. There will be some pressure temporarily in the line between the valve and the outlet if the lever is engaged with nothing hooked to the outlet, but that will bleed off in a short time. An exception to this is the American series of tractors. The whole system operated all the time with around 250 psi as I remember, unless a function is being used; then the system goes up to the max of the relief valve.

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Ollie

08-24-2003 07:45:46




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 Re: Are implement outputs supposed to be pressuriz in reply to Farmer in the Dells (WI), 08-24-2003 07:21:19  
Huh? You are expecting no pressure at a port when the pump is running?

I'm assuming your PTO complaint is that the shaft still turns when the lever is in the "disengage" position. I guess you could call this an unintended safety feature. Attempting to hook up a driveshaft to s spinning PTO shaft is a great way to get badly hurt. The engine should be "off".

Having said that, your tractor should have a PTO brake which either you don't know how to use or isn't working. Maybe Myron or someone with an 1850D can fill you in.

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Myron KY

08-24-2003 11:25:34




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 Re: Re: Are implement outputs supposed to be press in reply to Ollie, 08-24-2003 07:45:46  
Yep, Farmer in the Dells, my 1850 had both problems when I got it. The remote outlets were not original. even the mounting brackets were changed using (gasp) IH parts. It was all pretty much a Rube Goldberg setup. One outlet leaked all the time the other you could connect the hose alright but could not disconnect under pressure or not. Needless to say all that came off and was replaced with new Pioneer connectors and a bracket from TSC. I even splurged and got the more expensive connectors that are easily connected/disconnected under pressure. While still not original and more of a Myron Goldberg repair, it's very functional. Here's a pic. (please excuse all the dirt and debris.)

third party image


The spinning of the PTO is a common complaint. Assuming your PTO clutch disks are not warped, adjusted correctly and the PTO brake is still good, it sounds like you need to adjust the brake. If you look at your PTO engagement lever and linkage you'll see where this adjustment is made at. (Sorry I haven't a picture of this.) You'll know you adjusting the right direction when it gets harder to move the lever rearward to the Off and locked position. Please don't use the brake to slow down or stop any PTO operated equipment. This will only shorten brake life. And please, for safety's sake, turn the engine off before connecting/disconnecting the PTO on any tractor. HTH
Myron KY

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