Nitrogen Accumulator for 3520

[MBJones]

I've read several post here discussing accumulators, but cannot find anything definitive. I'm looking to add one to my 3520 to act as a shock absorber for my Normand N74 Hybrid blower in hopes of protecting my 3 pt hitch components while motoring down the highway. Has anyone out there installed one or know where I can get more info. I know the theory, I need part numbers, and advice on where to T into my hydraulics as well as plumbing parts and schematics. So I need details, not theory. I've read post on here about folks with the same issue, but the posts end without resolution.

 

[ptsg]

If your tractor has internal lift cylinder for the 3 pt, I don't think it's possible to plumb the accumulator. It would need to be plumbed right after all the position/draft control valves.

Then you would need to figure out the volume of the accumulator and the pressure of the nitrogen that would work with the weight of the blower.

I think this is why tractors don't have this feature, because the nitrogen pressure would need to be constantly adjusted for different weights of implements. That's why you also don't see solutions on other posts.

 

[MBJones]

This mod seems to be routinely done in Canada on Deere and Kubota CUTs with large inverted blowers. These tractor do not have draft control and the load on the 3 point is known and constant, at least while it is elevated. I know it's being done, I'd just like to hear from those guys. Was it successful or just a failed experiment?

 

[ptsg]

It's probably done on tractors with external cylinders for the 3pt, where you have access to the cylinders and hoses to the cylinders.

If you can figure out the volume and nitrogen pressure needed and then a way to tap into the 3 pt cylinder, go for it. It has everything to work right.

 

[LouNY]

They are easily installed on loader lift arms,
if I was contemplating one for the 3 point I think I would go with it on the top link.
The toplink see's the most bouncing forces while traveling with a load on the rear lift.
What N2 accumulators I have seen most have been under a liter in size,
the ones I have seen are a bladder type with N2 at a bit over your system pressure relief.

 

[oldnslo]

Is there a gauge port to check the 3 point relief valve pressure on that model Deere? If yes you could potentially use that port to install an accumulator.

Nitrogen pre-charge pressure? Not sure but suspect would need to be around 70 - 80% of system relief. May also require a manifold assembly with solenoid valve to isolate the accumulator during normal use similar to FEL soft ride feature most soft ride systems also incorporate an orifice to restrict how quickly the accumulator discharges to prevent the pogo stick bouncing

 

[ptsg]

Using an accumulator on the top link as Lou suggested is the easiest route.

I've read on a German forum for Branson tractors, that someone used a 0.75L Accumulator with a 30 Bar (435 Psi) Nitrogen pressure for the loader with an empty bucket.