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Power up/Power down

Discussion in 'Truck & Equipment Repair' started by Gmgbo, Feb 25, 2009.

  1. Gmgbo

    Gmgbo Senior Member
    Messages: 159

    Does power down actually pull the body down or does it just slowly release the pressure? Also, Im in the process of changing my 85 k30 from PTO dump to electric hydrolic. What size pump should I use? psi?
  2. wild bill

    wild bill PlowSite.com Addict
    Messages: 1,239


    power down entails the electric motor running to bring the unit down .it's a bit faster coming down ,especially when it's cold .you need to find out how big the pump is on the hoist now ,before you can spec the new elec pump .small pick up or trailer hoist is generally no biger than 1-3 gpm and about 1800-2000 psi .:salute:
  3. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    power down also pumps fluid into the other side of the cylinder as it comes down. if it comes down w/ gravity it wont fill the back side of the cyl, thus pouring oil out of the resevoir fill cap onto the ground. is your cyl double acting or telescopic? double will have 2 hoses. a tele will have one on the bottom.
    Last edited: Feb 25, 2009
  4. cretebaby

    cretebaby PlowSite Veteran
    Messages: 4,162

    Oil will flow into the other side of the cylinder by suction if left down with gravity
  5. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    negative, without the pump running it will overflow the tank. the back side of the cyl acts as a resevoir. that is on a scissor hoist. a tele cylinder has no back side.