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Got my powertrol valve housing off,,,

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Ray

06-09-2003 19:21:19




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My lift was not holding the brush hog up. It would lift it but it would fall fairly quickly when I put the control handle in neutral position. It got so that it would fall even if I had the the handle in lift position but engine was running slow. I pulled the piston out thinking it the piston cup was shot.

I found the piston cup is only somewhat bad in one area around the circumference. The piston is galled on both sides. The left side of the piston is pretty rough about 45 degrees around the pin. The cylinder is scored in only one small area about one quarter inch square. Unfortunately, it is near full "up" position.

Question: I can either hone the cylinder with an engine cylinder hone or try to free hand it with an emory cloth. Which is best? I use the tractor maybe 15 hours a year. I really don't want to remove key 51 (the basic housing) in order to replace the cylinder. I figure I'll replace the piston just to minimize chance of further scoring the cylinder.

Deere offers the leather cup like mine has or they offer a plastic U cup for a different piston(newer?). Which will hold up better in an imperfect cylinder?

Please tell me if there is another reason the lift droops. Key 81 the throttle valve looks good. I have not checked any other parts. I'm trying to leave it as much undisturbed as possible so I don't have to adjust stuff.

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chris in wi

06-10-2003 06:05:51




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 Re: Got my powertrol valve housing off,,, in reply to Ray, 06-09-2003 19:21:19  
Ray-

If the lift cylinder is galled, you'll probably want to replace it, especially since you say that the gasket between the cylinder and the basic housing is potentially bad. These cylinders are probably widely available at scrapyards, call around. I'm not sure you'll be able to geta good seal again if the cyliner is galled. You'd probably have to fill in the galling to really get it right.

Don't be overly concerned about removing the basic housing, it's not a big deal, really. Just be sure to support it, as they are not held on by anything but the bolts around the perimiter, and your foot could be in for a big surprise if you unbolt the assembly without blocking it. I just put my "A" powerlift and basic housing back on the day before yesterday. Did it by myself and it took about 40 minutes. Helps to have blocks stacked in "steps" up to the rear of the tractor so you can "walk" the housing up if you don't have any help around.

chris

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Ray

06-10-2003 10:20:16




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 Re: Re: Got my powertrol valve housing off,,, in reply to chris in wi, 06-10-2003 06:05:51  
Thanks for your tips. I have a loader on another tractor. I was thinking that would be helpful to lift it a bit as I manipulated it. I'd still block it in case the loader dropped it unexpectedly. What's your experience tell you?



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chris in wi

06-10-2003 11:45:06




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 Re: Re: Re: Got my powertrol valve housing off,,, in reply to Ray, 06-10-2003 10:20:16  
Blocking should be sufficient by itself. I took off the drawbar assembly first, then piled oak blocking up to just below the bottom of the bull-gear housing, then added small, flat wood wedges until I had them up tight against the bottom of the bull-gear housing, which is just about flush with the bottom of the basic lift housing. Then I unbolted the bolts on the perimeter of the basic housing. Still needed a little persuasion to break free the old gasket, but when it breaks free, be sure you're holding it! After it's free, if you've stacked your blocking like steps, you can hold the basic lift by the rockshafts, snug your stomach up against the back of the housing (where the power-trol used to be mounted) so you don't hurt your back, and "walk" the basic lift down the blocking. If you're strong enough, you can just lift it off and set it down somewhere else. Lean it against a wall with the otside against the wall, as you need to work on the cylinder, and it sticks out too much to lean the unit securely against it. On my "A", I'd estimate the basic lift weighed about 80 pounds, maybe a hundred, but I had the power-lift assembly and the PTO pump removed. If you're not taking the PTO pump apart (don't if you don't need to) you'll get the pump shaft too, which is connected to the PTO shaft drive by a linkage that will slide right out. Having a helper on hand would be nice too, to have someone "spot" you or grab one end of the rockshaft.
As for the loader, I think that even though the basic lift is heavy, you're better off doing it by hand, as it's sort of delicate too. And by all means, if the power-trol unit and pump are still attached, get help, as the sucker will be heavy!

From there, it's pretty easy to see how to get the cylinder off!

Hope I've been helpful-


Chris

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Ray

06-10-2003 15:14:32




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 Re: Re: Re: Re: Got my powertrol valve housing off in reply to chris in wi, 06-10-2003 11:45:06  
Chris

Thanks for your advice. I'm on vacation for a few days so I'll work on this late next week. I'll post again to let you know how it went. I checked the JD dealer today and learned that the cylinder and gasket are out of production. I can make the gasket. I'll need to dress the cylinder as best I can. Unless there is after market parts available. Does anyone know of a source?

Ray



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morgan

06-12-2003 08:06:49




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 Re: Re: Re: Re: Re: Got my powertrol valve housing in reply to Ray, 06-10-2003 15:14:32  
Ray- I just ordered a gasket for the cylinder about 6 weeks ago from Deere. got it the next day! Check another dealer maybe your dealer just didn't want to mess with it. It seems that when I call my JD dealer(50 miles from me) they always say the part is unavailable BUT when I make the drive in and order it in person, and they have to look it up, most of the time they can get the part. I just found my receipt; -cylinder gasket-part#A623R-$2.07 and the leather cup #A626R-$26.20
and the big gasket for the rear end cover# A412R $ 12.56. My 'A' is a 46 model. hope this helps-morgan

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F-I-T

06-11-2003 08:05:49




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 Re: Re: Re: Re: Re: Got my powertrol valve housing in reply to Ray, 06-10-2003 15:14:32  
Ray:

Greg Stephen might carry that gasket. You can reach him by phone or through his website.

Frank-in-Tallahassee
70D // 855



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Bill

06-11-2003 06:05:42




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 Re: Re: Re: Re: Re: Got my powertrol valve housing in reply to Ray, 06-10-2003 15:14:32  
Ray I think you need a high quality gasket, I ordered mine thru my deere dealer, Mr Clooney says a cheapie will blow out easy, ,,,,Bill



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Ray

06-11-2003 20:27:33




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 Re: Re: Re: Re: Re: Re: Got my powertrol valve hou in reply to Bill, 06-11-2003 06:05:42  
I checked the Deere dealer here and they said it has been out of production since '52. I'm within an hour of the Deere Waterloo factory and 3 hours from their Davenport facilities but I doubt that will help me. Where do I go to find this part, other than touring other dealers?

Thanks

Ray



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Moye

06-10-2003 18:41:54




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 Re: Re: Re: Re: Re: Got my powertrol valve housing in reply to Ray, 06-10-2003 15:14:32  
Ray, I just pulled my housing about umpteen times trying to get the PTO right on my 70D. I used an engine hoist to pull the entire housing as a part by my self. If I had not had it and did have a loader, I would probly use the loader with a come-a-long between the loader and the housing. That way, you can add pressure a little at a time without much trouble. When I went back on, I took a piece of threaded rod, cut two sections and threaded them in two holes on the rear end of the tractor. Used these as line up tools until I could get some bolts started. Made my gaskets from gasket paper and used a sealer when I went back together. Good Luck, Moye

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Bill

06-09-2003 20:42:51




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 Re: Got my powertrol valve housing off,,, in reply to Ray, 06-09-2003 19:21:19  
Tore down my G to find gasket blown as you describe, my lift was settling fast too,bet thats your problem,it aint to bad a deal to pull that housing Good luck Bill



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Ray--Key 5 gasket bad als

06-09-2003 19:40:42




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 Re: Got my powertrol valve housing off,,, in reply to Ray, 06-09-2003 19:21:19  
I forgot to mention that I noticed a bad spot on the lower side of Key 5, the gasket between the cylinder and the basic housing. It appears to be gone between the center bottom hole and the cylinder itself. Is that center bottom hole in that gasket passage for the high pressure fluid? If it is, I suppose I am loosing my pressure there. What do you think?



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