600 Hydraulic Problem

[Hobo,NC]

Our notes just crossed. Are you saying to adjust the turnbuckle to adjust the position control also?

I am saying everyone I tried to get dead nutz I had to lift the cover up and shorten that adjustment the lift arm ends were to far off the ground.

 

[Btzj02]

I can't imagine that something suddenly changed that prevents you from adjusting correctly that wouldn't be very obvious. I am sure you are following the procedure in the shop manual but I would double check everything again before reinstalling and hope it works. Make sure the lift lever is in the correct position for Draft and Position control adjustments and verify the lift arms are in the correct position while making your adjustments.

 

[buickman]

I agree. Though I never used the draft control and it was frozen. The position control worked fine until one day, it did not. I don't know if anyone else had been in there before, but my guess is that it was never opened up. I think my next step is to ignore the draft control and adjust the position control to the .450, put the cover back on the tractor and see what happens.
I don't like to work this way, but I'm quite sure I have done the procedure correctly - 3 times

 

[Keith Williams]

I agree. Though I never used the draft control and it was frozen. The position control worked fine until one day, it did not. I don't know if anyone else had been in there before, but my guess is that it was never opened up. I think my next step is to ignore the draft control and adjust the position control to the .450, put the cover back on the tractor and see what happens.
I don't like to work this way, but I'm quite sure I have done the procedure correctly - 3 times

Again,
someone a while ago figured out that the draft control spring has worn into the casting over time. They found that if they put one or two washers (5/8 If I remember correctly) at that ware point, it would make up for that ware and allow the adjustments to be made.
This is from my memory, I don't remember who or when.
IHTH
Keith

 

[buickman]

Thanks Keith. There is no wear on the bottom that contacts the casting surface. I tried my idea of ignoring the draft control adjustment to no avail.
The bolt on the position control will run out of thread on the upper nut before I can lower the adjustment to make the .450 clearance.
I know the procedure in my sleep:
Cover is vertical
Lift arms are adjusted to 1/2" from full bottom
Draft control arm is set perpendicular to cover
Lift lever is set to "up" position (in relation to cover being vertical)
Turnbuckle is set so valve has .395 clearance to piston casing. Tighten turnbuckle.

Draft control arm is now set parallel to cover
Lift lever is set down
Draft position nut is loosened
Draft position bolt is turned to try and accomplish .450 clearance between valve and piston casing.
The closest clearance i can achieve is about .700 before running out of nut

Anyone see an error here? I hope so.

 

[Btzj02]

The last question I can think of: Is the follower pin installed correctly and is it touching the cam when you do the position adjustment.

 

[buickman]

Good question. I'll be at the shop again on Friday and see.
By the way, you guys have been wonderful.
I am so grateful

 

[buickman]

Just got back. Yes the pin is against the cam when I am adjusting the position control

 

[buickman]

Before I re-install. a couple of questions.
P1 - when I now change from draft control adjustment to position control adjustment the valve hits the top of the cylinder.
Also, anyone know why the valve is scored?
P2 is the gap of the position control spring assy. when the lift lever is in the center position
P3 is the gap of the position control spring assy. when the lift lever moved to the upward position. should the gap be there?
Should the valve hit the top of the cylinder?

 

[mhb@ufe]

Try moving the lift arms up as you move the handle up.

 

[Btzj02]

My last comment. Really! Do a search for the Chicken House Mechanic and watch his videos tearing down and reassembling the Hydraulic Top Cover. Something doesn't seem right and maybe his videos will help. You may not want to hear this but I would think it better to disassemble every part of the top cover, replace all gaskets, seals and O rings and reassemble while comparing your work to the CHM than to reinstall the Hydraulic Top Cover and hope it works. The top of your control valve that is scored looks nothing like the ones I have seen. ( See my previous picture. Good luck. If you get it working please post the fix.

 

[buickman]

Thank you, Yes moving the arms have no effect.
Does someone have any answers to my above question?
Before I re-install. a couple of questions.
P1 - when I now change from draft control adjustment to position control adjustment the valve hits the top of the cylinder.
Also, anyone know why the valve is scored?
P2 is the gap of the position control spring assy. when the lift lever is in the center position
P3 is the gap of the position control spring assy. when the lift lever moved to the upward position. should the gap be there?
Should the valve hit the top of the cylinder?

 

[buickman]

Update. I went through the video again, adjusted the position control to avoid any collision with the piston housing and reassembled the cover.
The lift arms will only rise about 2 inches no matter how far the lift lever is pulled back - Failure is so depressing.
If anyone knows who can fix this machine in the Georgetown SC area and if worse comes to worse, who I can send the cover to, to repair and send back to me, it would be greatly appreciated.

 

[mhb@ufe]

Get in touch with Just 8Ns,
704-482-9913
2505 South Post Rd.

Shelby, NC. 28152

Might be worth a road trip.

 

[buickman]

Thank you!
I will.
Anyone else?

 

[Hobo,NC]

work the control valve with a long screwdriver, go through the fill plug in the top cover.

 

[Gene in Mi]

Thank you!
I will.
Anyone else?

Update. I went through the video again, adjusted the position control to avoid any collision with the piston housing and reassembled the cover.
The lift arms will only rise about 2 inches no matter how far the lift lever is pulled back - Failure is so depressing.
If anyone knows who can fix this machine in the Georgetown SC area and if worse comes to worse, who I can send the cover to, to repair and send back to me, it would be greatly appreciated.

1. Don’t give up!
2. What do you mean in your second sentence? Raise hydraulicly or by lifting on them with your hand.
3. This began with something being stuck in the linkage. Maybe you bent something?
4. Don’t give up! Are you sure you have the little lever under the seat (position-draft) in the right spot when making your adjustments? Put it in a vise upside down and move the control handle and then the lift arms, it is a mechanical linkage, you should be able to figure it out.

 

[buickman]

Hi Gene,
The arms will only rise hydraulically 2". I can manually raise and lower them (slowly) by hand and did so several times, thinking there might be air in the system.
Did not work. I thought of the bent idea but did not see any indication. There was some scoring on the valve as seen in the picture, but no one seems to know why or how it could become marred. This might be a clue, but the valve is not bent.
I'm sure I made all adjustments correctly - 3 times. I do not think the valve should be hitting the top of the piston cylinder
The cover is now back completely assembled on the tractor

 

[Gene in Mi]

Hi Gene,
The arms will only rise hydraulically 2". I can manually raise and lower them (slowly) by hand and did so several times, thinking there might be air in the system.
Did not work. I thought of the bent idea but did not see any indication. There was some scoring on the valve as seen in the picture, but no one seems to know why or how it could become marred. This might be a clue, but the valve is not bent.
I'm sure I made all adjustments correctly - 3 times. I do not think the valve should be hitting the top of the piston cylinder
The cover is now back completely assembled on the tractor

Can you do as Hobo suggested? Force the control to lift?

 

[buickman]

I'm headed to the shop in a short while.
I'll be happy to report when I return this afternoon
Thanks so much