Front suspension accumulator

[Claas Andy]

Looking to find a new accumulator for a Claas Axion 820. I have priced one from Claas and it seemed a bit expensive and I know that it is 1.4 litres capacity but does anyone know the pressure it should be charged at? It is a DANA front axle which i think is used on the bigger Masseys as well. Thanks.

 

[Tractortech]

Now Then..
Usually, the pressure is stamped on the actual accumulator.. How do you know it's faulty?? Is having it repressurised not an option??

 

[Claas Andy]

There seems to be lots of numbers on it but wasn't certain which was the actual pressure. I opened the allen key at the end and oil came out so I thought it must be buggered

 

[Tractortech]

Ahhhh,,,, sure sign of failure... The pressure will be followed by 'Bar' I would say..
I've adjusted the pressure in a few so that's an option..

 

[Claas Andy]

Do you think it will be around 50 bar?

 

[Tractortech]

For reference, a John Deere 5125R is 44 - 46 bar... They'll all be similar.

 

[Colliedog]

Before you go and buy one just check the thread on the end. Most accumulators have 1/2 or 3/4 BSP threads but most large manufactures have bespoke ones made with there own fitting so as customers then have to buy them though the manufacturer. Sometimes you can get an adaptor to make them fit but finding the thread in the first place is often a challenge. Your local Claas service manager will have the pre charge pressure in his service manual but whether this is the optimum pressure is a completely different matter!

 

[john432]

Manufacturers are cunning.... but we need to think outside the box. The accumulator could be mounted somewhere else... side of the engine, under the bonnet etc, with a flexable hydraulic pipe connecting to the hydraulic valve/ manifold.. a 1.4 ltr accumulator can be had for around £150...even a lot less.

 

[4440]

Fastrac ones can be had for £40 each.
I had two accuumulators moved from the front axle on a MF due to them hanging below the axle. An easy job, just added a short length of hydraulic hose to the new mounting Place.

 

[4440]

I don't think un doing the Allen key on the end of the accumulator would be a very good idea.
If there is still 40 bar in the cylinder, I would think it could do some very serious damage to your self.

 

[Matthew Britton]

I don't think un doing the Allen key on the end of the accumulator would be a very good idea.
If there is still 40 bar in the cylinder, I would think it could do some very serious damage to your self.

I may be wrong but I think you will find that behind the Allen screw is a Schroeder valve of sorts so no pressure should escape until you fiddle with that valve.

 

[4440]

I may be wrong but I think you will find that behind the Allen screw is a Schroeder valve of sorts so no pressure should escape until you fiddle with that valve.

Thanks for clearing that up, that makes sense.

 

[cosmagedon]

I've never seen a Schroeder valve underneath but that's not to say there isn't a type out there somewhere. If your checking to see if it's popped you want to drain the hydraulic pressure first and then only crack the Allen bolt to see what comes out. The Allen bolt is more like a bleed valve with a o ring under the head.

 

[Claas Andy]

Just an update we worked out it should be 20 bar pressure so we bought one of the Polish ones off Ebay and bought an adaptor to go from the accumulator BSP thread to the Claas thread. Seems to be working fine and it ended up £300 cheaper than getting one off Claas

 

[Tractortech]

And here's another update. I just did the accumulators on a JD6330 premium.
One has 609 Psi in and the other 2 which operate as a pair should have 580 Psi.
The single one only had 450 Psi in and the other 2 were at 250 psi. When I loosened the screw with a 6mm Allen key, a couple of spoonfuls of oil came out of the pair. There is no Schrader valve in them. The recharging adapter has a 6mm hex drive to open the valve under pressure when connected to the nitrogen.
As there was only a small amount of oil present, I set all 3 to the correct pressure and calibrated it.. We can only see how it goes before we start spending bigger money

 

[Farmer_Joe]

And here's another update. I just did the accumulators on a JD6330 premium.
One has 609 Psi in and the other 2 which operate as a pair should have 580 Psi.
The single one only had 450 Psi in and the other 2 were at 250 psi. When I loosened the screw with a 6mm Allen key, a couple of spoonfuls of oil came out of the pair. There is no Schrader valve in them. The recharging adapter has a 6mm hex drive to open the valve under pressure when connected to the nitrogen.
As there was only a small amount of oil present, I set all 3 to the correct pressure and calibrated it.. We can only see how it goes before we start spending bigger money

how do you test the pressure in them, I’ve got 2 clutch ones on my mf would be interested to know if there anywhere near the pressurevthey should be!

 

[Tractortech]

You need one of these,,,,
Or a dealer with one..

 

[Suckndiesel]

You need one of these,,,,
Or a dealer with one..

Does this look any way decent to you? Seems cheap, other kits I seen were £300 or £400

 

[Tractortech]

Yes, it looks as good as anything. Mine was kinda expensive, supplied by tractor manufacturer and an awful thing to use in my opinion. I have used others in the past which were simpler than mine. You'll need a cylinder of nitrogen and a suitable regulator for it too..
I don't know what thread the JD accumulator was,,,, but 32mm spanner took the protective cap off..

 

[Colliedog]

Yes, it looks as good as anything. Mine was kinda expensive, supplied by tractor manufacturer and an awful thing to use in my opinion. I have used others in the past which were simpler than mine. You'll need a cylinder of nitrogen and a suitable regulator for it too..
I don't know what thread the JD accumulator was,,,, but 32mm spanner took the protective cap off..

Most Accumulator charging port threads are M28x1.5. I've got the kit above and its fine for farm use and very good value for money. The only thing against it is it has a 400 bar gauge with an obscure thread which makes charging low pressures less accurate