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Bomford hedge cutter hydraulic accumulator

  • 26-08-2013 7:30pm
    #1
    paudie2005
    Registered Users, Registered Users 2 Posts: 103 ✭✭


    Hi looking for a bit of help I am doing up an old bomford farm trim hedge cutter. It has an acummalator on the primary ram, I suppose to take the shock out of it when traveling but using it with the acumalator makes it difficult, has anyone ever come across one like this (picture attached) and am I correct in assuming its a matter of unsiezing the nut on the tread and twisting it to lock out the ram?
    Any information appreciated
    Thanks


Comments

  • #2
    pakalasa
    Closed Accounts Posts: 4,552 ✭✭✭pakalasa


    Ya you're right, hydraulic accumulators are there to absorb any shock loading from sudden movements. They should only work above a certain oil pressure. There is a pre-charged gas in there, that keeps a valve closed and only allows it to open when the oil pressure goes above a certain threshold.
    It sounds like the gas has leaked out of your accumulator. This would explain why the movement is bouncy. It may just need to be re-charged again with gas.
    Is there any writing on it? The company I work for, have often sent Accumulators overseas by air-freight, so we have to depressurise them first. Re-charging is standard practice with them. Nitrogen gas normally.

    http://www.machinerylubrication.com/Read/2305/hydraulic-accumulators


  • #3
    paudie2005
    Registered Users, Registered Users 2 Posts: 103 ✭✭paudie2005


    pakalasa wrote: »
    Ya you're right, hydraulic accumulators are there to absorb any shock loading from sudden movements. They should only work above a certain oil pressure. There is a pre-charged gas in there, that keeps a valve closed and only allows it to open when the oil pressure goes above a certain threshold.
    It sounds like the gas has leaked out of your accumulator. This would explain why the movement is bouncy. It may just need to be re-charged again with gas.
    Is there any writing on it? The company I work for, have often sent Accumulators overseas by air-freight, so we have to depressurise them first. Re-charging is standard practice with them. Nitrogen gas normally.

    http://www.machinerylubrication.com/Read/2305/hydraulic-accumulators

    Thanks for the response. There doesn't appear to be any writing on it, when you say it's standard practice is it a matter of taking off the unit and bringing it to get filled with nitrogen, what's the general process for making sure its correctly pressurized?


  • #4
    pakalasa
    Closed Accounts Posts: 4,552 ✭✭✭pakalasa


    I havent seem one recharged, but I gather it's just a matter of connecting it up to a N2 Gas bottle and filling it with gas. The bladder may be damaged inside, so it might be safer, considering the age of it, to get a new one altogether. A good hydraulic place shoud be able to check it for you and have it re-charged.


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