am I getting the runaround?

[JeffTerry]

long story short, call your tractor rep/manufacture and make a complaint

 

[MHarryE]

My top and tilt both leak, speed dependent on load. Pilot operated checks needed jst like most people with experience with top and tilt have answered.

 

[daugen]

well, what I've learned here really clearly is the dealer sold me the wrong cylinders. But they are the "name brand"; wonder if that same company also offers units with check valves or if there is an add on solution that doesn't require buying new cylinders. This is very disappointing. Yes, I need to check my angles occasionally, and I understand that...gravity and load are doing everything possible to pull that piston down.

Well, from now on, let's suggest check valves to newbies folks. But first I'll swap the lines and see if I get lucky.
And for now, I have to take the cylinders off, replace them with the manual ones, and then put the big mower back on.
Now that's annoying. The dealer suggested that I only use it with a rear or box blade. Really. Ok.

 

[J_J]

As you probably know all cyl can bypass with some wear and a load on them.

Even a check valve will not prevent the bypassing.

A new cyl with check vale works great,

As they said, remote valves can leak but it is probably the cyl.

You can try needle valves in line with the cyl.

This is a pilot operated check valve.

Surplus Center - 1/2 NPT 16 GPM BRAND PC50C PILOT-OP CHECK VALVE

 

[johnnyvol]

I haven't installed a TNT yet, so this is probably a noob question. Are they leaking down under power also, or just when left overnight? I've had a few hydraulic operated implements over the years and can't recall any of them leaking down while under pressure (while the tractor was running), but they almost all seemed to leak slowly over time if not used. All I ever had to do to correct it was to fire up the tractor and wiggle the lever and everything would tighten up.

With all that said, a TNT might be different, hence my question. I want things to stay put while in operation but am not too concerned with how they act during idle time.

 

[daugen]

I want things to stay put while in operation but am not too concerned with how they act during idle time.

:thumbsup:
that sure works for me. But an inch drop in less than an hour is ridiculous. Might have been double that...

I guess I'll go to the dealer for a can of Instant Check Valve. Just pour it over both ends of the cylinder and it will fix me right up.
:confused3:

 

[J_J]

There really is no difference in the process of leaking down.

When a valve is in neutral, there is supposed to be a hyd lock.

Should a cyl move, then it is simply seal bypass.

With a valve in neutral, most times there is no pressure on the spools. However, should the last valve in a hyd system be activated up to the the relief pressure, then all spools upstream will have pressure on the spools, and could force some fluid past the spools.

So if it leaks down operating, then it might have some help.

Different hyd machinery have different leak down rates. I would assume that the more precise the spool is to the valve, it will have a leak down rate less than a less precision spool and valve assembly.

Of course the wear and tear on a spool valve assembly will add up over time.

You can see old machinery with hyd that will hold a load up for weeks it seems. Just good workmanship and precision parts.

You can also see hyd on new machinery descend with no help as you watch it.

 

[brain55]

There's a big difference in an inch an hour versus 3" in half an hour. An inch an hour while operating is quite reasonable in my opinion, 3" in half an hour would be totally unacceptable. So I'm not sure which it is now.

 

[oldnslo]

The PO check will reduce the drift problem. Downside of a PO check is it will also eliminate the option of having float capabilities.

 

[Gator6x4]

I haven't installed a TNT yet, so this is probably a noob question. Are they leaking down under power also, or just when left overnight? I've had a few hydraulic operated implements over the years and can't recall any of them leaking down while under pressure (while the tractor was running), but they almost all seemed to leak slowly over time if not used. All I ever had to do to correct it was to fire up the tractor and wiggle the lever and everything would tighten up.

With all that said, a TNT might be different, hence my question. I want things to stay put while in operation but am not too concerned with how they act during idle time.

They leak or drift down when in use or setting. You attach a rotary cutter or rear finish mower get the side to side level and the front to rear set. You use for a few minutes and the right side is scalping and the front controlled by the top link is also out of kilter. You stop, re-adjust and a few minutes later repeat the process.

Using a scrape or box blade in level mode, look back and the right side is cutting a trench. Using a tiller is really an experience. Hang a sixty gallon sprayer on the rear and spray one side at 28 inches and the other at 20.

My first experience with top and tilt was with Gannon Cylinders. Dealer replaced, Gannon said all cylinders leak or drift down. No more help. That is when the experienced hydraulic person advised to install cylinders with check valves. This was years ago. Cylinders still operate like they did when first installed.

Sure is nice, adjust one time and use all day.