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Gary Singleton
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Joined: 23 Mar 2015
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 Posted: Tue Jan 31, 2023 7:28 am Post subject: 8n hydraulics |
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the top piston was redone lift works good when pump is running but when I slow the engine down the lift goes down slowly rev engine up lift goes back up where should I check seems like a valve is leaking down or could it be the piston any help would be apperciated
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JMOR
Tractor Guru
Joined: 13 Aug 2007
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| Posted: Tue Jan 31, 2023 7:52 am Post subject: Re: 8n hydraulics |
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| CVPost-Gary Singleton wrote: | | (quoted from post at 11:28:23 01/31/23) the top piston was redone lift works good when pump is running but when I slow the engine down the lift goes down slowly rev engine up lift goes back up where should I check seems like a valve is leaking down or could it be the piston any help would be apperciated |
You have to eliminate all nine potential leak points, by inspection, etc.
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Leroy
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Joined: 09 Jan 1998
Posts: 23764
Location: Wapakoneta, Ohio
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| Posted: Tue Jan 31, 2023 8:51 am Post subject: Re: 8n hydraulics |
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What you are describing is normal for a new tractor direct from the factory. The Lift piston cannot seal tight enough to keep oil from leaking past. The tractors I have had all do that, 41 9N, 44 @N bought new, NAA, Ferguson TO-30. even the 65 and 68 Ford 4000 and 68 5000
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TheOldHokie
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Joined: 08 Apr 2005
Posts: 11631
Location: Myersville, MD
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| Posted: Tue Jan 31, 2023 3:15 pm Post subject: Re: 8n hydraulics |
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| CVPost-Leroy wrote: | | (quoted from post at 12:51:45 01/31/23) What you are describing is normal for a new tractor direct from the factory. The Lift piston cannot seal tight enough to keep oil from leaking past. The tractors I have had all do that, 41 9N, 44 @N bought new, NAA, Ferguson TO-30. even the 65 and 68 Ford 4000 and 68 5000 |
Leaking down so fast position control on an 8N can't correct is not normal and indicates a very large leak somewhere.
TOH
This post was edited by TheOldHokie on 01/31/2023 at 03:16 pm.
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Abbby
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Joined: 28 Mar 2009
Posts: 605
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| Posted: Wed Feb 01, 2023 4:23 am Post subject: Re: 8n hydraulics |
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TheOldHokie is correct
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Leroy
Tractor Guru
Joined: 09 Jan 1998
Posts: 23764
Location: Wapakoneta, Ohio
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| Posted: Wed Feb 01, 2023 8:20 am Post subject: Re: 8n hydraulics |
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I don't see anything about leaking down so fast. New piston
and rings might or might not help.
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Leroy
Tractor Guru
Joined: 09 Jan 1998
Posts: 23764
Location: Wapakoneta, Ohio
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| Posted: Wed Feb 01, 2023 9:47 am Post subject: Re: 8n hydraulics |
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I did not say anything about full throttle but just a bit. So
explaine to me how the 8N was so different in not needing
anything above an idle when the 9N, 2N, NAA, TO039 , 65 4000,
68 4000 and 68 5000 all did reqyire a bit of throttle. And I
have had all these tractors and still have the 9N and the 2N
bought new in may of 44. So what is so much different in the
8N that it can do at idle what none of the others could do. I
am talking about a 50-75 RPM difference.
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