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JD 60 power-trol Question

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Lenn

09-19-2002 07:14:58




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1953-60,I just mounted a rotary cutter on my 60 to find out the three point won`t hold in the up position.It has good lifting power but seeps down.
I took out the two check valves and cleaned and inspected the ball seats and they look fine.
I seen in a post in the archives that the o-rings on the lower hose coupling if bad could cause this problem,what is the likelihood that thats the problem? I can see o-rings in there,can they be replaced from the outside? Or is it probably a blown gasket or bad rings on rockshaft piston.
Trying to feel this out a little before getting to excited,any thoughts are appreciated.
Lenn.

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Bob K

09-20-2002 07:50:30




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 Re: JD 60 power-trol Question in reply to Lenn , 09-19-2002 07:14:58  
My 50 power-trol crept down as well. When I removed everything in the back end during restoration, I replaced both the O-ring and the leather seal on the rockshaft piston. Holds great now. Didn't have to fix or mess with anything else.

Unfortunately in your case, this means removing the rockshaft housing and it can be pretty heavy. Be careful. You will also have to replace the rockshaft cylinder gasket, the housing gasket, and the O-rings on the pipes from the pump. Soak the leather seal in engine oil overnight before installing it on the piston.

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Lenn

09-20-2002 10:55:31




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 Re: Re: JD 60 power-trol Question in reply to Bob K, 09-20-2002 07:50:30  
Thanks Bob K.,I`m going to leave it for now too much work to do with it,i set the brush cutter at the right height with the three point arms in the down position so all i need it for is to lift it over stumps and such and it will do that.
Thanks all for the replies.
Lenn



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Clooney

09-19-2002 08:51:01




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 Re: JD 60 power-trol Question in reply to Lenn , 09-19-2002 07:14:58  
Lenn, if it has a bad cylinder gasket the oil level in the power-trol would drop as the oil would be going into the trans.
~It could be a leaking "O" ring but more than likely it's the piston seal.
To check the piston seal; raise the rockshaft with a load & back the throttle valve adjusting screw all the way out until it is clear of the valve so the valve stays seated, if the rockshaft drops, it is either the piston seal, blown cylinder gasket [if the oil is staying in the P/T that is good] or a cracked or porous housing casting. If it stays up with the throttle valve closed suspect an �O� ring or valve housing gasket���..

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Matthew

09-21-2002 19:56:56




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 Re: Re: JD 60 power-trol Question in reply to Clooney, 09-19-2002 08:51:01  
I was reading up to determine the best plan of attack on my 720 for the same problem. The manual I have recommends installing a test fixture made by R.B. Precision Tools in place of the regular throttle valve. The idea appears to be the same. If the lift leaks down with the fixture in, the problem is in the piston/cylinder assembly. Otherwise, it is in the control valve housing. Questions - Can I apply the same process described above for the 60 and accurately diagnose a 720? If so, shouldn't I screw the valve in instead of out to seat it (not sure if a 60 and 720 adjust the same way)? Thought and ideas appreciated.

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Lenn

09-19-2002 09:43:14




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 Re: Re: JD 60 power-trol Question in reply to Clooney, 09-19-2002 08:51:01  
Thanks Clooney,but you lost me on the backing the throttle valve out.
Which and where are we talking about with that,excuse my lack of knowledge.
I`ll have to keep a eye on the oil level,i haven`t had the tractor too long.
Lenn



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Clooney

09-19-2002 17:46:01




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 Re: Re: Re: JD 60 power-trol Question in reply to Lenn , 09-19-2002 09:43:14  
Lenn, the throttle valve adjuster is the adjustment screw under the cap on the lower rear of the power-trol housing. It is the same valve that is used to control the implement fast drop speed. Remove the cap over the throttle valve screw, loosen the loc nut & back the screw out until you can feel by turning it that it isn't contacting the valve. The location, & what it looks like is in your owners manual. If you still can't figure out what it is & looks like, E-Mail me & I will E-Mail you a picture of the throttle valve adjusting screw.....

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Lenn

09-19-2002 18:03:13




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 Re: Re: Re: Re: JD 60 power-trol Question in reply to Clooney, 09-19-2002 17:46:01  
Yep,i know what you are refering to now,i new it by the fast drop name.
Its backed out about 7 turns and the rockshaft drops. It`s looking more and more like the piston seal or gasket.



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