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John Deere Tractors Discussion Forum
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49 B JD Powertrol

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Jeremy Brault

08-03-2003 14:48:00




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I have A 49 B JD. The powertrol is messed up. I was wondering why it pushes the oil out of the pto shaft seal. It will also damn near kill the tractor when you put it in gear. Is there a stuck relief valve? I also hooked it up to a cylinder and it doesn't do anything. Any help will be great. Thanks
Jeremy




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Clooney

08-03-2003 18:42:32




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 Re: 49 B JD Powertrol in reply to Jeremy Brault, 08-03-2003 14:48:00  
Jeremy, That "almost kills the tractor when you put the PTO in gear" says you have a blockage in the system somewhere. If it was the relief valve it would only cause a problem when the Power-Trol lever was moved & there was a restriction. When the lever is in neutral the oil flows freely back into the sump. ~If that tractor ever had an aftermarket live hydraulic pump on it might still have the block-off plate between the Power-Trol housing & tractor rear housing [look for 2 gaskets & steel plate between the P/T housing & tractor rear housing].
~If the pump is working that hard it is probably making more pressure than the seal can handle..
~If your problem isn't that block-off plate you probably have a restriction in the P/T housing somewhere. ~If your high pressure problem only happens when the operating lever is moved to raise or lower the rockshaft you could have the wrong block off plugs in the rear of the P/T housing [you need open front plugs] If you are the using closed front remote cylinder plugs with pipe plugs in them you will make too much pressure & the rockshaft won't work...

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Jeremy Brault

08-03-2003 18:54:28




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 Re: Re: 49 B JD Powertrol in reply to Clooney , 08-03-2003 18:42:32  
Clooney.
This is not the problem. i have had it all apart. it does it no matter where the lever is. i have had the pump apart, found a bad bearing, still not it. I am clueless.

Also had the box all off and cleaned it all out. it used to work till we tried to change the powertrol box off of another tractor (AJD)with a magneto pump. we put ther magneto pump on to. would not work so we changed it all back. still does not work. but was fine before we changed the boxes. we did this to get live hydraulics, and because the box off of the B neede to be rebuilt. we neede a tractor for snowremoval, thought it would be quick. i am clueless.

any help will be good.
thanks jeremy

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Clooney

08-04-2003 03:34:36




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 Re: Re: Re: 49 B JD Powertrol in reply to Jeremy Brault, 08-03-2003 18:54:28  
Jeremy, I still think you will find your problem in a blockage between the P/T box & tractor rear cover area. I'm thinking you have that square hole covered up on the bottom between the P/T box & tractor rear cover. That add on pump you tried to install came with a steel block off plate & 2 gaskets. Either that plate is stuck to one side or the other or you have a mounting gasket with that square hole not punched. ~Pull the P/T box back off & MAKE SURE the oil can flow from the pump channel [turn the PTO shaft with the P/T box off to find the pump outlet square hole]. Then MAKE SURE the P/T box has a matching hole that isn't covered up & that the oil can flow into it.
~While the P/T box is off use LOW PRESSURE compressed air or a garden sprayer with diesel fuel in it & add pressure to the bottom square hole in the P/T box. It should freely flow into the P/T sump cavity with the hand lever in neutral. If it doesn't you have a problem in the P/T box.
~One last thought..If your P/T has the live power elbow on the bottom, remove that & install a pipe plug...

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F-I-T

08-03-2003 16:27:43




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 Re: 49 B JD Powertrol in reply to Jeremy Brault, 08-03-2003 14:48:00  
Jeremy:

The Powr-Trol pump is on the PTO shaft behind that 6 or 7 hole cover, so if the seal on the shaft for the pump had failed, that's likely where your leak is originating.

If you have a stuck or sticking relief valve, that could have caused the failure, or it's just old and needs replaced.

Does the rockshaft work ? Can you force the rockshaft down with a pipe wrench and watch it raise back up via the pump ? Or does the pump stall the engine as soon as you try ?

On the cylinder, are you using the rear facing ports and the adapters with the pipe threads ? Or are you using the side plugs ? It's possible that you might have the wrong combination of plugs.

Let us know exactly what you have.

Frank-in-Tallahassee
70D // 855

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Jeremy Brault

08-03-2003 19:02:52




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 Re: Re: 49 B JD Powertrol in reply to F-I-T, 08-03-2003 16:27:43  
Frank
the hydraulics used to work till we tried to change the powertrol box off of my A JD with a magneto pump. we bolted just the powertrol box to the rear Cover on the B JD. that is when it all started. We also had the magneto pump on. so then we put the old B jd box back on, and still was bad. took the magneto pump off too, at the same time, so everything that was on the B is on there now. no extras. so did we srew something up by tring the magneto pump. i am clueless. we took the pump apart, and found a bad bearing. thought it was that. also put a new seal and put it together. still didn't do it. it stalls the tractor no matter where the lever is. we tried the different plugs so we could tri the rockshaft. same thing still. no matter what we try, kicks oil out the pto seal

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Jake

08-03-2003 20:53:36




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 Re: Re: Re: 49 B JD Powertrol in reply to Jeremy Brault, 08-03-2003 19:02:52  
With the live pump there would have been a thin steel plate and and gaskets on the mounting face of the power-trol unit. Sound like you have that steel plate in there which blocks off oil flow from the PTO driven pump. You'd better check again for that plate in there as mentioned before.
While the power-trol box is off you should be able to run the tractor and PTO and oil should shoot out a rectangular/square (I think) hole until the oil reservoir is empty.

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