I have an early 80s jd 540b cable skidder that turns fine to the right once pressure builds up it will not go back to the left we changed the steering valve both cylinders are New we put in a New system relief valve all that did was smooth out the lifting of the blade need help... Changing a pressure line today we fear may be collapsing hope it fixes it anyone have any other suggestions please help
- Thread starter jdjr
- Start date
glennster
Well-known Member
if it uses hydraulic drive motors, one on each side, it could be a bad drive motor. i replaced one last year on my older prime mover skidsteer. it was driving weak on one side and i had a mystery hydraulic leak. turns out the drive motor was leaking into the chain case and filling it with oil.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Is serial number below or above 400572 as there's 2 different steering valves?
Ken Macfarlane
Well-known Member
1. Make sure your new orbital valve has the same port pattern as the old one. It sounds like a couple of hoses are swapped.
2. Tee in a gauge and see whats going on.
2. Tee in a gauge and see whats going on.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
With that serial number your machine should have a
steering valve similar to a 4020 which could have a valve out of adjustment.
that's the box we have we have the books to the skidder that's the diagram we have as well the steering valve has been rebuilt and tested and it worked properly on AIS's testing equipment there is something else goin on we removed all 4 lines to the turn cylinders and the pressure is going to the right spots on them we replaced hoses for fear of one being collapsed I'm at a loss here
Kent Petersen
Well-known Member
Glen i think he talking about a log skider not a skid steer
Ken Macfarlane
Well-known Member
Read up on a few others, didn't realize it doesn't have a normal rotary style steering valve. Every thread I read says either valve was bad or plastic from cylinders or locknut stuck
in the valve. There is apparently a bleeder on the valve too but its not supposed to cause this issue.
Does it do anything funny when you try to steer and operate the blade, or run the blade against the stops so its in relief?
in the valve. There is apparently a bleeder on the valve too but its not supposed to cause this issue.
Does it do anything funny when you try to steer and operate the blade, or run the blade against the stops so its in relief?
I read them issues as well... done all I can do to flush the system I disconnected the 4 lines to the turn cylinders from the valve to make sure the pressure from the valve is going to the head end of the cylinders that was all good... while turning left and right with the lines disconnected from the steering valve the fluid flows like it should I feel like it's on the return side maybe cause when u release the pressure either loosen the bleeder or a hose it will turn both ways smoothly also once pressure builds up and it stops turning left fluid pours from the steering valve around the pressure line to the right cylinder only while holding left turn pressure on the wheel .... I'm not sure about the nut ...I do remember reading about it not sure what nut specifically tho... Ty any and all help appreciated
Ken Macfarlane
Well-known Member
It sure sounds like a check valve was assembled wrong on the return side of the cylinders. From reading a bit its supposed to be a closed centre system so a closed centre 2 way
closed neutral spool valve could be fitted in a pinch to steer like a timberjack. A regular orbital valve may not work, the ones I've used are meant for open centre. I'll see if I can
find out.
closed neutral spool valve could be fitted in a pinch to steer like a timberjack. A regular orbital valve may not work, the ones I've used are meant for open centre. I'll see if I can
find out.
Ken Macfarlane
Well-known Member
Sure enough there are closed centre orbitals, I'd guess thats what newer machines use.
Ken Macfarlane
Well-known Member
Not my writing but found on net:
There is a bleeder valve on the left side of the steering valve, under the cowel. Turn the steering wheel all the way to the left, open the bleeder valve (a little bit) then very slowly turn the wheel back to the right. If the machine actually starts to turn, you're going too fast...slow down. When only fluid comes from the bleeder close it.
There is a bleeder valve on the left side of the steering valve, under the cowel. Turn the steering wheel all the way to the left, open the bleeder valve (a little bit) then very slowly turn the wheel back to the right. If the machine actually starts to turn, you're going too fast...slow down. When only fluid comes from the bleeder close it.
well here's what I know there are 6 individual lines coming from the steering valve 4 go directly to the turn cylinders and the other 2 go out to the hydraulics manifold on top of the transmission none of them are hooked together unless it ties together inside the steering valve which is kinda what is illustrated in the manual
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Here's the steering line schematics for OP's machine serial number range.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
I still think steering valve body valves aren't adjusted correctly
(quoted from post at 10:00:27 12/08/15)
I still think steering valve body valves aren't adjusted correctly
If you have it connected as shown that is correct, the same circuit goes to the but of one cylinder and the rod of the other, I am not a JD person and some here have much more knowledge than I, follow their lead and you will get it going.
I'm with u tx.. I believe AIS did nothing to it and sent me a $1300 Bill. Said it was work in n I fell for it I've heard some of these horror stories about AIS since I had it rebuilt ohhh agony(quoted from post at 07:24:44 12/08/15)(quoted from post at 10:00:27 12/08/15)
I still think steering valve body valves aren't adjusted correctly
If you have it connected as shown that is correct, the same circuit goes to the but of one cylinder and the rod of the other, I am not a JD person and some here have much more knowledge than I, follow their lead and you will get it going.
Ken Macfarlane
Well-known Member
I agree, it sounds like a spool that locks the cylinder when not steering isn't opening to let fluid pass.
the illustrations of the valve u r posting look like the one I have that Being the lower portion of the entire valve that portion of the valve contains the feed return and the returns from the cylinders and the upper section that connects to the top of the illustrated section contains the feeds to the cylinders the feed to the left cylinder comes from a plate that mounts between the top and bottom sections of the valve and the feed to the right cylinder comes from the top of the right side of the upper portion of the valve... I agree it sounds like it's out of adjustment not allowing the fluid to flow back thru the system on a left turn it's all I have left I've exhausted all other possibilities I can't come up with any other logical reason for this
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
All I'm basing my information on is the serial number you posted plus my very limited JD industrial experience. Can you post a photo of steering line routing?
JonathaninMa
Member
How did the problem begin? Was it after you replaced the steering valve?
JonathaninMa
Member
.. If its the original steering vaalve , just "rebuilt" I'd lean towards someone not adjusting it correctly. I was asking as I got involved in a similar head scratcher--- someone rebuilt the same valve in a 644B loader and would lock in one direction.. I finally figured out that the "rebuilder" added a plug that he thought he misplaced during dis-assembly to a port on the bottom of that valve thats been pictured here--- some systems used a plug in the port but this one didnt---removed plug and all was well. But if this is the original valve and the problem just happened during use, I'd look for someone to double check the valve settings and other items in there-- The book says to set the valves tight at something like .001 and .003 or something similar--- I usually go a couple thousandths over that so the valve isnt so touchy as your usually holding onto the wheel bouncing through the woods, so with it a little looser on the settings i think it isnt trying to steer left right so aggressively.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Ditto on maladjusted valves. If it was my problem I'd ship valve to Tim s in Ohio and let him test it on his test stand.
Similar threads
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.
Copyright © 1997-2024 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