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NAA Hydraulic Check Valve Seat


 
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CAC63
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Joined: 18 Dec 2010
Posts: 28
Location: Central Indiana

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PostPosted: Fri Jan 04, 2013 6:35 am    Post subject: NAA Hydraulic Check Valve Seat Reply to specific post Reply with quote

I read in the I&T manual for Hydraulic troubleshooting if the loaded lift slowly dropped a foot or so and stopped when the engine was shut off, then there was a leak associated with the control valve. If the lift continued to fall all the way down when the engine was shut off, then the leak was associated with the check valve. My lift falls all the way down in about 10-15 minutes under a heavy load. I replaced the steel ball and saw no improvement. Can anyone recommend how to recondition the seat or is this a waste of time?

Thank you to everyone for your wisdom. Because of you, I have a great operating and reliable tractor.
 
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Dean
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PostPosted: Fri Jan 04, 2013 6:57 am    Post subject: Re: NAA Hydraulic Check Valve Seat Reply to specific post Reply with quote

Probably a waste of time, but you may try seating the ball into the seat with a hammer and brass drift IF you are certain that you have replaced the old one with the correct sized ball. I always use a different ball to seat the seat than the one that I plan to install.

Are you CERTAIN that the lift piston is not leaking?

Dean
 
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CAC63
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Joined: 18 Dec 2010
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Location: Central Indiana

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PostPosted: Fri Jan 04, 2013 7:07 am    Post subject: Re: NAA Hydraulic Check Valve Seat Reply to specific post Reply with quote

I am certain the lift piston is not leaking. I replaced all the orings, gaskets, and follower pin last weekend. I took out all the plugs and sprayed all passages and small holes with brake cleaner. I made all adjustments according to the I&T manual. I even had a friend machine a Nuway tool gauge for setting the lift. All works great.
 
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JMOR
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PostPosted: Fri Jan 04, 2013 7:42 am    Post subject: Re: NAA Hydraulic Check Valve Seat Reply to specific post Reply with quote

cac63 wrote:
(quoted from post at 11:07:48 01/04/13) I am certain the lift piston is not leaking. I replaced all the orings, gaskets, and follower pin last weekend. I took out all the plugs and sprayed all passages and small holes with brake cleaner. I made all adjustments according to the I&T manual. I even had a friend machine a Nuway tool gauge for setting the lift. All works great.
4 potential leak spots for situation that you describe & you seem certain to have eliminated at least the ram lift cylinder. Other 3 are check valve, ram cylinder safety valve, and control valve.
 
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