Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Harry Ferguson Tractors Discussion Forum
:

Lift Leak

Welcome Guest, Log in or Register
Author 
Dan from Petosk

10-02-2005 18:00:56




Report to Moderator

I recently aquired a 1953 TO-30 and with a 6' back blade the lift arms will drift down within 20 seconds of shutting it off. I started my trooble shooting with a hyd. pressure gage and with the lift arms held down I could only get to 1250 PSI. I also removed the side covers and there was no leaks from the lift cylinder. I am planninng to rebuild the pump and replace the pressure relief valve and control valve.

Am I on the right track?

I am also looking into one of the aftermarket position controls. What is your opnion?

[Log in to Reply]   [No Email]
LesWV

10-03-2005 19:00:47




Report to Moderator
 Re: Lift Leak in reply to Dan from Petoskey, 10-02-2005 18:00:56  
Sounds like the same problem I had with a 1952 TE20 that I bought.
The lift would hold good while the engine was running. But would drop soon after it was shut off. The heavier the load. The quicker it would drop.

Problem turned out to be a bad cylinder. It had a groove cut/worn into it on the bottom that allowed the fluid to leak past the packing. Replaced the cylinder and installed new packing and have not had a problem in over 20+ years.

[Log in to Reply]  [No Email]
Jerry/MT

10-03-2005 15:27:07




Report to Moderator
 Re: Lift Leak in reply to Dan from Petoskey, 10-02-2005 18:00:56  
I agree with John. You need to find the root cause of the problem and not start changing out components or rebuilding the pump. Open the access plates on the side of the tractor and actuate the 3 pt and look for leakage. (DON"T STICK YOUR HAND IN THERE WITH THE ENGINE RUNNING!)
The fact that your pressure is at 1250 psi doesn't mean your pump is necessarily bad. If there is a leak, the pump will supply flow to the leak as well as the cylinder but at a lower pressure due to the pump's pressure-flow characteristic.

[Log in to Reply]  [No Email]
dan frim petoskey

10-03-2005 18:06:26




Report to Moderator
 Re: Lift Leak in reply to Jerry/MT, 10-03-2005 15:27:07  
thanks for the reply, pulled it into the garage and took another look at it. checked out the pressure pipe going to the top, no leaks found. looked at the piston again, and only a few drops comming from there. took apart the the lift spring control and found no problems there. i removed the seat and listened at the top casting and heard oil leaking when the arms were pushed down. i suspect the leak to be under the oil level where the pressure tube exits the pump. my shop manuals show no details of the pressure tube. How is the pressure tube fitted to the top casting, O-ring? How is the pressure tube fitted to the exit of the pump, O-ring? I can't drain the oil low enough to see if the leak is there. Any help would be appreciated!!! Sounds like you have already saved me $350.. I guess I owe you a beer if you get to Petoskey Michigan.

[Log in to Reply]  [No Email]
Jerry/MT

10-04-2005 21:33:40




Report to Moderator
 Re: Lift Leak in reply to dan frim petoskey, 10-03-2005 18:06:26  
Maybe John (UK) can help you. I have looked at my parts manual and it doesn't show the connection between the pump and the cylinder. I believe it's a tube that goes up to the cover and then through a drilled passage to the cylinder/piston. My gues is it would be o ringed, but it's just that- a guess.Oh oh wait a minute, I found a tube on the page that shows the rear axle casting. There is a tube that is on the right hand side between the first and second bolt hole. That must be it.You should be able to see it looking from the left side access port over to the right side ahead of the rt side access port. No more details on the tube though.

[Log in to Reply]  [No Email]
john (UK)

10-03-2005 06:06:00




Report to Moderator
 Re: Lift Leak in reply to Dan from Petoskey, 10-02-2005 18:00:56  
Position Control for a back blade is good, it will give you more positive control but the tractor is capable of controlling the blade when the hydraulics are ok and if you have a wheel fitted, just lengthen and shorten the top link to give more or less pressure onto the control spring to control the draft. Try Zane Sherman for a Position Control kit:[email protected] or
Link
Can't say that you are on the right track with the hydraulic problem, all you have done is confirm that you are low on pressure and that there is a leak, which you knew any way as it was dropping. You need to find the leak as once you remove the pump you cant find it as there is no pressure to leak. It may not be the Pump and you could rebuild it and still have the same problem. You need to locate the leak first then repair it. It is most likely a gasket and for that there is no need to rebuild the Pump and it will be expensive to do that. You need to check properly where the leak is, is it in the bottom right front corner where the pressure leaves the pump to go up to the ram cyl. or is it the top right front corner where the pressure leaves the pipe to go to the ram cyl. check this from the left side of the tractor through the port hole using a flashlight. Check the end of the ram cyl. that it isn't cracked or the gasket on the ram isn't leaking (front end) If you need more information on what to do and how to do it I have an Information sheet with pictures, if you need this email me at:- fergusontractors (at) tiscali (dot) co (dot) uk....replace the () with . and @ as required. and tell me again what you need.

[Log in to Reply]  [No Email]
Dan from Petoskey

10-07-2005 07:15:11




Report to Moderator
 Re: Lift Leak in reply to john (UK), 10-03-2005 06:06:00  
Well the saga continues. I looked again for the leak and could not find it in the upper right corner. Even with the oil level lowered there was no turbulence in the lower right corner either. So I removed the PTO shaft (which has a leaking seal I need to replace anyway) and dropped the pump. Let me say here how impressed I am with John (UK). He not only replied to my postings but sent along descriptions and photos as well. Very helpful stuff. Thanks John.
Upon inspection I found the control valve needle to be bent and presumably leaking. Looks like someone before me tried to remove the pump without disconnecting the control fork. Also the seating surface on the check valve, located on the end of the pressure relief valve, was rough. The bottom gasket seemed fine. I left the top cover on as the cylinder is not leaking. FYI, the pressure tube looks to be pressed into a through drilled hole in the casting and the designers rely on the top and bottom cover gaskets to seal it?? Not he way I would have done it but you can�t argue with success.
I have ordered the PTO seal and gasket / $25, pressure relief valve / $25, control valve / $23, and the pump gasket / $3. So far only the control valve has arrived. Hopefully the remaining parts will show up so I can work more this weekend. I will clean the inside of the casting, change the oil, reassemble and test the results. I also noticed some light scratches on most of the hydraulic pump pistons. I hope I can get along with 1250 PSI for now. I don't want to rebuild the pump. I am also hoping that replacing the bent needle on the control valve will solve my problem.

I will keep you posted on my efforts.

Thanks to all for your comments and ideas.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy