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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD500-A accumulator

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Ken in Mich

04-16-2005 05:41:24




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When I shut off the engine, my brakes immedialy dont work. Checking the service manual, it says that the dealer has to recharge the accumulator with nitrogen. Is this the only way to fix? I was thinking of trying compressed air, but thought I check here first. Its not a big deal not to have breaks when its not running, I just drop the bucket. The breaks work great otherwise. Thanks, Ken




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jdemaris

04-16-2005 20:21:05




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 Re: JD500-A accumulator in reply to Ken in Mich, 04-16-2005 05:41:24  
As I recall, the accumulators Deere used don't have bladders. Just a separation wafer with sealing rings. You'd probably waste your money recharging it. They leak off, I've charged many of them. Nitrogen is used because it is dry - compressed air retains moisture and moisture freezes and/or causes corrosion. A good accumlator wouldn't gain you much anyway. Some machines have one for the steering and one for the brakes. When they are in GOOD working order, it gives you a few pumps on the brake pedal before it loses its charge - and that's it. Same for the steering, a few wobbles back and forth and the accumlator is all done. Just enough reserve to build up your hopes when in a bad situation - and then - just when you think you;ve been saved - everything is gone - no brakes, and no steering. It's happened to me more than once. Deere had quite a few lawsuits over the tractors with full-hydraulic steering and brakes and don't build them like the 2520,3020, 4020, or 440 skidders anymore. One note - the accumlator was not put there just to provide reserve hydraulics. It absorbs hydraulic shocks in the system, acts as sort of a "shock absorber."

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NC Wayne

04-16-2005 18:13:56




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 Re: JD500-A accumulator in reply to Ken in Mich, 04-16-2005 05:41:24  
I've never seen an accumulator charged with compressed air. Nitrogen is always used because it's a dry gas as well as being inert so it won't react with the bladder material, etc. Something else you have to consider also is what type fitting the accumulator has on it as well as what pressure it needs to be charged to because both can make it harder than it sounds. There are several different types of charge fittings, one is the schrader valve (looks like the standard valve stem fitting) type which uses a small screw on type coupler. They can often be bought fairely cheap at a motorcycle store where they use them to charge gas shocks. The other types of charging tools are a bit more complicated and as of the other week were running in the $750 range for each individual type. If you have the schrader type charge port then you can charge it yourself for the cost of the tool and the rental on small cylinder of nitrogen which shouldn't be more than maybe $20. As far as the pressure you need to find that out too before you do anything. Even if it had a schrader fitting on it and you decided to put in 100psi of compressed air that's not gonna be worth anything if it's supposed to be charged to 2000psi. Too you could go through all the trouble to buy the needed tools, etc and charge it and find out the bladder itself has burst. Then you've just spent money on tools you really didn't need and are still gonna have to spend the money for a new accumulator. Charging an accumularor isn't all that big of a deal but it can get expensive depending on what you have. I'd call the dealership and see what they'd charge to charge it for you. if it's easily removable from the system you can take it off and take it to them and let them do it in the shop and save yourself a field service call if you wanted to. Hope this helps. Wayne

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