Toplink DO I NEED A CHECK VALVE ON MY HYDRAULIC TOP LINK ?

[tc35dforme]

Hi,

I recently installed a Tisco Hydraulic top link on my TC35D. The rear remote is a factory NH setup. I notice when using the box blade that the piston will move in and out with the force created by the movement of the tractor against the blade. If I twitch the lever, the problem seems to go away for a while.

Do I have an air bubble trapped somewhere in the loop ?? The unit has been on for a month and has been moved full stroke many times.

Do I need to add hydro check valves on the piston ??

Thanks ...again

 

[Mosey]

I'm starting to regret buying a Tisco! See Hydraulic side link settles. My Gearmore top link has never settled or moved unless I move the lever.

 

[tc35dforme]

Danny,

I think I had an air bubble in the cylinder. I dropped it down and let it hang...cycled it full stroke several times and it seems fine. We'll see how it runs over the next couple of weeks.

It seems to be plenty tight when I operate it ( good seals ). It can flop my heavy duty boxblade ( Midwest BB30-72 ) back and forth even when full of dirt. And it will stay there now that the air is out.

 

[Mosey]

</font><font color="blue" class="small">( I think I had an air bubble in the cylinder. I dropped it down and let it hang...cycled it full stroke several times and it seems fine.)</font>

I guess I'll give that a try. I usually leave it most of the way up, so I'll extended it all the way out and let it sit overnight that way and see if that helps. Thanks.

 

[Slamfire]

If you were to put a check valve in the hydraulics, and hit something immovable you couldn't see the implement will be unable to kick up, and the tractor can go over backwards.

 

[John_Mc]

Re: DO I NEED A CHECK VALVE ON MY HYDRAULIC TOP LI

</font><font color="blue" class="small">( If you were to put a check valve in the hydraulics, and hit something immovable you couldn't see the implement will be unable to kick up, and the tractor can go over backwards. )</font>

Can't see how this would be much of a danger, since a cylinder with a check valve should work pretty much like the manually adjustable link that came standard with the tractor... at least as far as not letting the implement "kick up".

John Mc

 

[Slamfire]

Re: DO I NEED A CHECK VALVE ON MY HYDRAULIC TOP LI

Oh yeah, that was them old drawbar tractors that flipped over. Danged old timers disease. /forums/images/graemlins/crazy.gif On your 3 point, if the top link is ridgid and you hook somethin' immovable, you either run out of traction or bend the heck outa your implement. /forums/images/graemlins/blush.gif

 

[OkieG]

tc35dforme, Mosey, John Mc, and anyone with hydraulic Top Link experience,

Can you give an update on the Top Link settling issue?

Last weekend I finished my hydraulic Top Link project (Prince control valve and cylinder), and though I am pleased with it, it allows implements to settle. But, that's no different than with my Front End Loader or BackHoe. They also settle.

While at first, a faulty cylinder was what I was thinking, I've been told that hydraulic fluid most likely leaks back through the control valve (rather than the cylinder) and tolerances are such that leak back should be expected. Something about "metal to metal fits" in the control valves always allow some leakage.

I haven't used my BoxBlade yet, but I've noticed that the back end of the BrushHog drifts down about an inch a minute when up in transport mode.

Thanks,

OkieG

 

[Rowski]

I have a toplink from CCI. It has double pilot valves. No setting, even if not in use for a while.

My thread about my HTL... with pictures of the double pilot valves.

 

[OkieG]

<font color="blue"> I have a toplink from CCI. It has double pilot valves. No setting, even if not in use for a while.
</font>

Rowski, your feedback is appreciated. Good to hear settling is not a problem using the check valve. Does having the check valve cause any problems that you know of??

I have talked to CCI (Mark) several times over the past months. First time, the end of May. I wanted the HTL for summer. Mark had just sold his last Top Link cylinder with the intregral check valve. New ones were to arrive in July. July came, and no cylinders. Exchange rate was the culprit. Maybe new cylinders by September, I was told. September came and no cylinders. Cylinders are a side-line and not our bread and butter business. Maybe this winter or next spring, I was told.

Well, I don't blame Mark. Cylinders are not his main business. I was willing to wait, cuz I thought a built-in check valve was a too cool idea and I couldn't find that type cylinder anywhere else. But, I got tired of waiting.

Some folks may be lucky enough to not have any drift down of their implement cylinders, but I have noticeable drift with my FEL, BackHoe and my new hydraulic Top Link. Each uses a different control valve and different hyd. cylinders. So, for me, I think check valves are the solution.

I don't know anyone who has check valves on their tractor, so Rowski, you are answering my main question...check valves work!

Is there any downside to having a check valve in the circuit?? I've heard the double pilot valves can chatter sometimes. Is that a problem?? Do you notice any difference, in general, using a circuit with a check valve versus one without?

Has anyone used a single pilot check valve for anything? To keep a BackHoe boom from drifting down, it seems like a single pilot check valve would be the ticket. Any ideas?

OkieG