8N Lift Shudder

Hi, all.

I've read some of the past threads about hydraulics that shudder, but it seems that the issues have been around bleeding the pump.

I had the piston replaced a couple of months ago (new piston, O ring, and leather gasket) because the hydraulics slowly lowered anything attached to them all on their own. With the repairs, everything worked great.

In the past week or so, the lift has worked fine but the travel on the quadrant has had some "dead" spots where nothing happens until I have the quadrant lever pretty close to the top or bottom of its travel.

Over the weekend I replaced the brush mower with a 6' blade. When I raised the blade today, the hydraulics shuddered quite a bit, even though the hydraulics still work.

Is it possible the system needs to be bled again? I have [b:e987f5b2df]no leaks and fluid level is fine.[/b:e987f5b2df]

Thanks.
 
One or more of the valves is hanging up, probably due to dirt and/or aftermarket parts.

No need to bleed submerged N pump.

Dean
 
I concur with Dean, no need to 'bleed' the N hydraulic pump. There is another issue causing this condition. You can try replacing the safety relief valve and see if that helps. What color is the oil? It should be a clear, honey shade. If it appears milky brown, you have contaminated oil with water. Contact me -my email is open -and I will instruct where to go to get a complete HOW-TO on doing simple 8N hydraulic system problem solving.

Tim *PloughNman* Daley(MI)
 
(quoted from post at 17:24:36 10/04/16) I concur with Dean, no need to 'bleed' the N hydraulic pump. There is another issue causing this condition. You can try replacing the safety relief valve and see if that helps. What color is the oil? It should be a clear, honey shade. If it appears milky brown, you have contaminated oil with water. Contact me -my email is open -and I will instruct where to go to get a complete HOW-TO on doing simple 8N hydraulic system problem solving.

Tim *PloughNman* Daley(MI)

RITE ON that's were I came up with slipping a clear hose over the end of the Safety valve so I could see it leaking. Another test is to install something heavy and long like a bush hog, raise it and jump on the tail to blow the safety valve clean if it works its a good guess the safety valve is a concern.
 
(quoted from post at 07:16:28 10/04/16)
(quoted from post at 17:24:36 10/04/16) I concur with Dean, no need to 'bleed' the N hydraulic pump. There is another issue causing this condition. You can try replacing the safety relief valve and see if that helps. What color is the oil? It should be a clear, honey shade. If it appears milky brown, you have contaminated oil with water. Contact me -my email is open -and I will instruct where to go to get a complete HOW-TO on doing simple 8N hydraulic system problem solving.

Tim *PloughNman* Daley(MI)

RITE ON that's were I came up with slipping a clear hose over the end of the Safety valve so I could see it leaking. Another test is to install something heavy and long like a bush hog, raise it and jump on the tail to blow the safety valve clean if it works its a good guess the safety valve is a concern.

I did play with it again this morning. It seems to shudder more when I'm not using the clutch pedal. If I engage the PTO and slowly let up on the clutch pedal as I raise the quadrant lever, the shuddering is minimal. If I just engage the PTO and don't use the clutch pedal at all when raising or lowering, then it shudders a fair amount.
 
(quoted from post at 06:24:36 10/04/16) I concur with Dean, no need to 'bleed' the N hydraulic pump. There is another issue causing this condition. You can try replacing the safety relief valve and see if that helps. What color is the oil? It should be a clear, honey shade. If it appears milky brown, you have contaminated oil with water. Contact me -my email is open -and I will instruct where to go to get a complete HOW-TO on doing simple 8N hydraulic system problem solving.

Tim *PloughNman* Daley(MI)

Tim, your email doesn't show on your profile.
 
(quoted from post at 14:34:08 10/04/16)
(quoted from post at 07:16:28 10/04/16)
(quoted from post at 17:24:36 10/04/16) I concur with Dean, no need to 'bleed' the N hydraulic pump. There is another issue causing this condition. You can try replacing the safety relief valve and see if that helps. What color is the oil? It should be a clear, honey shade. If it appears milky brown, you have contaminated oil with water. Contact me -my email is open -and I will instruct where to go to get a complete HOW-TO on doing simple 8N hydraulic system problem solving.

Tim *PloughNman* Daley(MI)

RITE ON that's were I came up with slipping a clear hose over the end of the Safety valve so I could see it leaking. Another test is to install something heavy and long like a bush hog, raise it and jump on the tail to blow the safety valve clean if it works its a good guess the safety valve is a concern.

I did play with it again this morning. It seems to shudder more when I'm not using the clutch pedal. If I engage the PTO and slowly let up on the clutch pedal as I raise the quadrant lever, the shuddering is minimal. If I just engage the PTO and don't use the clutch pedal at all when raising or lowering, then it shudders a fair amount.

Put the tractor in neutral and leave the clutch alone. By slipping the clutch at the same time you raise the 3pt you are adding another variable to the mix. The shudder is in the hydraulic lift circuit - not the drive line.

TOH
 
reading this post, lower right corner in BLUE has [Send Email] -just click on that and you'll get an info box to fill in with your name and message...My original post works for me but I posted it again below...
 
(quoted from post at 16:34:53 10/04/16) reading this post, lower right corner in BLUE has [Send Email] -just click on that and you'll get an info box to fill in with your name and message...My original post works for me but I posted it again below...

i DON'T SEE THE EMAIL LINK Tried classic view and not there either.
 
(quoted from post at 17:34:53 10/04/16) reading this post, lower right corner in BLUE has [Send Email] -just click on that and you'll get an info box to fill in with your name and message...My original post works for me but I posted it again below...

No email link/button in either Classic or Modern View.

You can email me directly at my name at yahoo.
 
this is interesting. in modern view here, nothing. in classic view, SOME posts have the email link, and some say No Email.
 
(quoted from post at 06:45:57 10/05/16) try refreshing your browser??? I use classic view, can see my email info, even sent a TEST email and it works for me...

Tim

I can find no email link in this response - Modern or Classic view. I have reloaded the pages and examined the source code for both. The page for Classic view does contain a "No Email" link with a target URL of:

[color=red:b6d2d5d7ea][i:b6d2d5d7ea]http://www.yesterdaystractors.com/no_email_addr.htm[/i:b6d2d5d7ea]
[/color:b6d2d5d7ea]
I suspect this is another one of the coding gremlins that infest this site, A simple work around would be to post your email address for him :idea:

TOH
 
(quoted from post at 08:47:11 10/05/16)
(quoted from post at 06:45:57 10/05/16) try refreshing your browser??? I use classic view, can see my email info, even sent a TEST email and it works for me...

Tim

I can find no email link in this response - Modern or Classic view. I have reloaded the pages and examined the source code for both. The page for Classic view does contain a "No Email" link with a target URL of:

[color=red:49813bcc1b][i:49813bcc1b]http://www.yesterdaystractors.com/no_email_addr.htm[/i:49813bcc1b]
[/color:49813bcc1b]
I suspect this is another one of the coding gremlins that infest this site, A simple work around would be to post your email address for him :idea:

TOH
ight have something to do with browser being used? I just guessing. I can see Tim's email link in Classic on two of his four postings, but not at all in Modern. The one with "try this...." and the one starting with "I concur with Dean...." Same with Firefox (49.0.1) and with MacBook (Safari 6.1.2)
 
(quoted from post at 09:37:39 10/05/16) Maybe it's easier for Tim to email Caleb... or better yet, post here. :wink:
41170.jpg



The screen grab is what shows in Edge, IE, Firefox, and Chrome. No email links whatsoever in any browser, nor in Classic vs Modern views.
 
I don't know, but the administrators/moderators/owners of this site have determined that if one posts anything about any other web site other than this one that can help folks with old iron/vintage tractors, they disallow you from even posting. Seems we are all in the same position seeking help and information so any and all that are out there should be shared...

Tim *PloughNman* Daley(MI)

Published FORD HISTORIAN author
 
(quoted from post at 08:41:33 10/07/16) I don't know, but the administrators/moderators/owners of this site have determined that if one posts anything about any other web site other than this one that can help folks with old iron/vintage tractors, they disallow you from even posting. Seems we are all in the same position seeking help and information so any and all that are out there should be shared...

Tim *PloughNman* Daley(MI)

Published FORD HISTORIAN author

Not exactly. They maintain this public forum for free and they have some simple rules of the road.

First and foremost they don't allow referrals to other businesses that compete with their parts business. Their filter only gets the bigger players and smaller ones often get through.

They also have a somewhat loosely enforced policy against "advertising". They seemingly have no problem with links to little guys like me that try to be discrete and pose no threat to their business.

They have no problem with links to informational sites with one notable exception. They specifically don't allow links to NTC because of past personal differences between the principles.

Unless you have an email address at NTC I don't think your email issue falls into any of those categories. Try posting your address as part of your message and see. Modern view will even automagically morph it into a clickable link just like it did to mine below.

TOH
[email protected]
 
(quoted from post at 07:41:33 10/07/16) I don't know, but the administrators/moderators/owners of this site have determined that if one posts anything about any other web site other than this one that can help folks with old iron/vintage tractors, they disallow you from even posting. Seems we are all in the same position seeking help and information so any and all that are out there should be shared...

Tim *PloughNman* Daley(MI)

Published FORD HISTORIAN author

Tim, I found the PDF of your "8N Hydraulic Lift--How to Repair Economically." Is that what you were talking about?
 

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