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spool valves

  • 24-11-2014 5:20pm
    #1
    oldsmokey
    Registered Users, Registered Users 2 Posts: 802 ✭✭✭


    Someone please explain single-acting and double-acting hyd spools...wots it mean?We have 4 spools in total on our old 7610, and 2 levers to work em..are they singe or double-acting?
    Ta


Comments

  • #2
    Tail Docker
    Closed Accounts Posts: 2,954 ✭✭✭Tail Docker


    oldsmokey wrote: »
    Someone please explain single-acting and double-acting hyd spools...wots it mean?We have 4 spools in total on our old 7610, and 2 levers to work em..are they singe or double-acting?
    Ta

    Should be Double acting(D.A). That means that the oil is pumped under pressure through both strokes of a service ram attached i.e it extends under full pressure and retracts under full pressure, pressurised oil on both sides of the ram slider seal, depending on wether the lever is pulled or pushed.

    Single acting is where oil is pumped out at full pressure when the lever is moved one way and flows back under gravity/by the action of the load returning the ram when the lever is moved the other way.

    4 spools and 2 levers is D.A. 4 spools and 4 levers would be S.A. UNLESS, your hydraulics are plumbed to give 2 S.A spools operated by the one lever, but that's unlikley.


  • #3
    oldsmokey
    Registered Users, Registered Users 2 Posts: 802 ✭✭✭oldsmokey


    Thanks for that, a succint reply :)...another one for ya taildocker, whats involved in getting a 1000 rpm pto in this old girl...is it a matter of swopping pto shaft for one with more splines, or is there more required...far as i can see theres only one lever with one position for the pto in the tractor,
    ta.


  • #4
    Tail Docker
    Closed Accounts Posts: 2,954 ✭✭✭Tail Docker


    oldsmokey wrote: »
    Thanks for that, a succint reply :)...another one for ya taildocker, whats involved in getting a 1000 rpm pto in this old girl...is it a matter of swopping pto shaft for one with more splines, or is there more required...far as i can see theres only one lever with one position for the pto in the tractor,
    ta.

    AFAIK there's a supplementary gear(s) that goes in the back end to alter the ratios as well as a 1000 rpm shaft itself. Not as simple as whopping in a new shaft. That's if it's an after-production option to uprate on your model, which I'm far from 100% that it was. You may be stuck with 540. I know one lad who took a 1000 rpm hydraulic set-up and made it work, but that was on an older 7700 and took a lot of spannering(I helped, but it was ages ago)


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