hyd accumulator

[Taylortractornut]

My favorite thing to do to an air start truck is to remove the air deflector and muffler off the starter exhaust of the truck.(Yes Im a Redneck) Its a safety feature then. Makes every one turn and look and make sure they arent in front of that truck lol. I usually put a valve stem on them to air them up if they leak till I can get the tanks sealed off on them. Most air start trucks here have a seperat air tank with checkvalves to keep them from gettin low. My proble with them is when one runs out or filters stop up ubleeding them you have to have another truck or mobile compressor.

 

[n4msl]

My Kioti dealer informed me today that I will have to install an accumulator to cure a high frequency squealing that occurs somewhere in the hydostatic drive system. Apparently it's a factory fix for the DK40HST. I never thought about it having side effects.

 

[Texan4Life]

had this idea too, so I googled it and found this thread.

Some were pointing out that this isn't really feasible. I say that it is because, well its already been done... that is add an accumulator to give a hydraulic circuit (like cylinders) some "spring".

They have been on combines (for the feeder house cylinders which pick up the header) since the 60's (our old massey super 92 had one, I think it was a option or aftermarket add on at the time). and have seen them on caseih 1680 and 2388 combines for example. Pretty much all combines have had them as standard features for decades.

Now most new row crop tractors (or at least deere and caseih that know of) have active front suspensions to make a more comfortable ride in the field.

And the accumulators on these apps are the size of a watermelon or smaller

Would be cool to see someone do it.

food for thought

 

[Zebrafive]

John Deere sells a Loader suspension kit that is just an accummulator, valve, hose and fittings to tie into the loader boom cylinder's head end. You charge the accummulator (once) with nitrogen based on the loads you expect to carry.

 

[swick1]

I'm building a grapple with a diverter valve for my 1026r. Now would be the time for me to try. How big would it have to be? I assume I need a way to turn it off for digging?

 

[Zebrafive]

I'm building a grapple with a diverter valve for my 1026r. Now would be the time for me to try. How big would it have to be? I assume I need a way to turn it off for digging?

I think JD uses about 90 cubic inch capacity. Yes you will want a valve to shut it off for digging. A manual high pressure ball valve would work.

 

[DaveOmak]

Technical Information :: Accumulators.com

This article outlines some of the many advantages accumulators provide whether they are hydraulic or pneumatic....

 

[Soundguy]

<font color="blue"> or if your tractor is parked in the garage and you want to move the loader to get to another greese fitting you wouldnt have to start the engine </font>

Something about the hydraulics being live without the engine running sounds to me like an accident looking for a place to happen. Especially if you have children, you know the ones that like to move all control surfaces out of curiosity.

ford 6000 had an accumulator on the 3pt, allowing you to move the hitch with engine off. I heard the same stories of injury / damage.. glad I don't have one.. etc..

 

[John47]

Only ever heard of hydraulic accumulators on hydraulic starting circuits on underground vehicles. Contractor got killed with one when an end cap blew off and hit him in the head. Don't recall the pressure they charged up to, but one side was full hydraulic pressure, the other side was nitrogen.

 

[EE_Bota]

We use accumulators at work for various purposes. Usually, we are storing up oil to buffer demands to make sure enough capacity is available. For example, imagine that your pump provides enough flow on average, but not enough for the worst peak flows. An accumulator is handy for that, but that accumulator will be on the pump side of things, not on the work ports side of things.

In one case, we have huge cylinders designed to provide pressure to the product, but the product is bucking up and down, and we need the cylinders to move such that nearly constant pressure is maintained, while allowing for expansion of the product. This is a "smoothing" function. This may be on the pump side of some systems, and is on the pump side on our system, but for a loader, it would need to be on the work port side of things. (I can use that accumulated capacity for some actions other than smoothing, but that system is likely to be far more elaborate than a tractor system. I can do a regenerative "pop" of the regen valve to start the ram raise, but my control is elaborate compared to a tractor too.)

In a simple system such as most tractors, using an accumulator for capacity accumulation is likely only feasible in a closed center system.

It is hard for me to see how a person could ever use an accumulator on a tractor loader to get both smoothing and speed increases. Rather, it will be the other way round...if it is used for smoothing, it will slow the loader down...since that accumulator has to get charged along with the cylinder end being pumped up.

So, listen to others who know better, but I think smoothing is doable for sure, but costs speed, and is available for closed or open center systems.
Capacity accumulation is separately possible, but only practical for closed center systems since for open center, a person would need to add valving to dump the pump flow after accumulator charging is complete.