TnT question

[Gordon Gould]

I leave the hydraulic lift link on all the time. To compensate for bleed down, I use a manually adjustable lift link on the opposite side. I adjust it to match the length of the fully extended hydraulic link

Simple idea - but I never thought of doing that. Thankyou sir !

gg

 

[John_Mc]

As far as shock load goes if you have the hoses disconnected from the cylinder, it seems to me that shock felt would be no greater than if you had the hoses connected to the cylinder. Other than due to some leakage through the control valve clearances the shock might be reduced slightly. But I imagine not significantly.

Wouldn't the pressure relief valve in the system set a max pressure seen by the cylinder when hoses are connected? When disconnected, there is no pressure relief

 

[John_Mc]

I leave the hydraulic lift link on all the time. To compensate for bleed down, I use a manually adjustable lift link on the opposite side. I adjust it to match the length of the fully extended hydraulic link

I use a similar tactic when I am working with something where I need to find level on the side links quickly: I have the manual link on the left and my hydraulic link on the right. I adjust the manual link so that the implement is level when the hydraulic link is as short as it will go. If the hydraulic link leaks down (or if I've adjusted it down to crown a road or something) I just hit the remote lever, retract the hydraulic link all the way, and the implement is level.

 

[Fallon]

Wouldn't the pressure relief valve in the system set a max pressure seen by the cylinder when hoses are connected? When disconnected, there is no pressure relief

The pressure relief valve on a tractor is at the pump or before the first valve. It protects the pump. There are no relief valves after any of the valves, unless you have something on an impliment or uncommon ride controll or cushion valves. Your loader lift, curl, 3pt & whatever else see full shock loads & overpressure every time you hit a bump or overload things.

 

[Henro]

The pressure relief valve on a tractor is at the pump or before the first valve. It protects the pump. There are no relief valves after any of the valves, unless you have something on an impliment or uncommon ride controll or cushion valves. Your loader lift, curl, 3pt & whatever else see full shock loads & overpressure every time you hit a bump or overload things.

This is true. But after thinking about it a bit more, my understanding is that some control valves, like loader control valves for example, have pressure relief valves (PRV) built in that exist on the cylinder side of the valve. In this case, shock load felt by whatever is connected to the cylinder would be limited somewhat when the cylinder was connected to the valve.

When the cylinder is not hooked to the valve, but essentially capped off (when the hoses are separated from the system) the cylinder/load would feel the full impact of the shock force (which would be limited by the PRV in the control valve, should there be one).

Accumulators (similar to an expansion tank in a home water system) are sometimes used to limit shock spikes in hydraulics. I think these are marketed by someone of use with tractor loaders.

However, I don't think PRVs are common in valves used in T&T control schemes. Mine certainly do not have any.

 

[Fallon]

Ya, accumulators definitly exist & I'm sure cylinder side relief valves exist. But they pretty uncommon to rare on CUT or utility tractors. The accumulators are somewhat prevelant as options on backhoes or bigger tractors.

An accumulator itself is going to be a few hunded bucks & you generally are over a grand to plumb it all up appropriately with a valve to lock it out when you need precision not comfort. I've got a crossover double relief valve on my hydraulic post hole digger. It was under $200 or something. But you won't find them on common loader valves or standard tractor hydraulics from the OEM.

 

[John_Mc]

Somebody posted a link on here some time ago to an aftermarlet supplier of accumulators for FELs on compact tractors.

... but I guess we are getting way off the topic here.

 

[MtnViewRanch]

Somebody posted a link on here some time ago to an aftermarlet supplier of accumulators for FELs on compact tractors.

... but I guess we are getting way off the topic here.

Here ya go. Comfort Ride Valve Kit | W.R. Long Inc.