Hydraulic accumulators...

[5030]

On the subject and not having to chase threads pertaining to them...

There are a number of them listed on Amazon as well as on the Motion Industries website but..

Be apprised of the maximum working pressure as well as their physical size and what the thead size is as well.

None of them are cheap simply because the containment vessel itself has to be built to withstand the working pressure and you can buy them pre charged or not charged but you have to have the equipment to charge them as well and they must be charged with an inert gas such as nitrogen for instance. They cannot be charged with compressed air because it's not inert and your compressor is not capable of attaining the required static working pressure required.

Having said that, you could charge them using inert gas in a welding bottle (which will have a regulator attached to it) and a welding gas bottle will have sufficient PSI to precharge one. Of course it will take specialized fittings to match the bottled gas regulator to the accumulator...

When purchasing ANY hydraulic accumulator, the static pressure in the vessel has to be set (charged) at just slightly below the maximum hydraulic pressure your tractor is capable of producing. If the static pressure is higher than the hydraulic pressure you unit is capable of producing, the cushion it provides is lost because the spike in pressure cannot overcome the pressure in the bladder in the vessel.

 

[screamin400]

I am running one on my 3 point hitch for a snow blower. Blower weighs in at 2k with no snow sitting on it. Tractor runs 2500 psi. I am now set at 900psi on the accumulator and can watch the blower even out the bumpy roads. It floats up and down about 4-6 inches and works great. Took a little time getting the pressures right.

 

[5030]

Hydraulic accumulators are much like a bladder tank on a well installation but the bladder tank operates ay much lower pressure and increased volume. Consequently, they don't have to be large because the volume they dampen is also much less.

 

[mikester]

Post some pics and specs when you install one.

I was thinking of adding one for my loader circuit with an electric valve I can toggle from in the cab. 3PH would be nice. Not sure off hand if that would affect my BH circuit.

 

[5030]

Keep in mind that any hydraulic accumulator must be pre charged with an INERT gas, not air and the pre charge pressure again, is way above when any normal compressed air supply can achieve. Curious as to how and what the one commenter charged his with and how he did it.

I know how I'd do it (using a bottle of inert welding gas like Argon for instance) but not everyone has that or has the proper equipment to achieve that either.

All the accumulators I see for sale, they all come not charged at all and must be charged on site, to work correctly.

 

[ruffdog]

I am running one on my 3 point hitch for a snow blower. Blower weighs in at 2k with no snow sitting on it. Tractor runs 2500 psi. I am now set at 900psi on the accumulator and can watch the blower even out the bumpy roads. It floats up and down about 4-6 inches and works great. Took a little time getting the pressures right.

I thought most 3pts float on their own?

 

[mike69440]

I have had a small 1/2 liter accumulator installed on my L39 TLB located downstream of the hydraulic pump since new. Recharged at 2,500 psi it is just enough to take some shock out of the system, but not enough to cause noticeable bounciness or be sluggish.

 

[Fixastuff]

The bomb for my excavator bucket quick coupler.

 

[rScotty]

I thought most 3pts float on their own?

The FEL accumulator is a combination spring and damping system for the lift arms.
Sometimes it is selectable on/off and also selectable rate

Some tractors come with an accumulator OEM installed with names like "easy ride".
We have that on our large JD.
On others you can add it as a kit. Larger Kubotas offer a kit. In fact I've got an OEM kit in the shop that may go on the M59 someday....maybe....

In use, you can see the lift arms move up and down - sorta like floating - a few inches when it hits a bump, but the lift arm movement doesn't shake the rest of the tractor.

3pts don't have any springing or damping at all except whatever is provided by the back tires... I guess they could, but I've never seen it. I'd bet some of the fancy European tractors have it though. On compact & utility size tractors here the 3pt arms are just hydraulic lift up and gravity down. Unless you add a kit yourself. The kits aren't expensive.

rScotty

 

[mike69440]

The FEL accumulator is a combination spring and damping system for the lift arms.
Sometimes it is selectable on/off and also selectable rate

Some tractors come with an accumulator OEM installed with names like "easy ride".
We have that on our large JD.
On others you can add it as a kit. Larger Kubotas offer a kit. In fact I've got an OEM kit in the shop that may go on the M59 someday....maybe....

In use, you can see the lift arms move up and down - sorta like floating - a few inches when it hits a bump, but the lift arm movement doesn't shake the rest of the tractor.

3pts don't have any springing or damping at all except whatever is provided by the back tires... I guess they could, but I've never seen it. I'd bet some of the fancy European tractors have it though. On compact & utility size tractors here the 3pt arms are just hydraulic lift up and gravity down. Unless you add a kit yourself. The kits aren't expensive.

rScotty

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