Dump bed rising VERY slowly

Discussion in 'Trucks and Trailers' started by Markf, Jan 20, 2008.

  1. Markf

    Markf LawnSite Senior Member
    Messages: 406

    We have a 2001 F550, 7.3 l with an electric lift. I started the truck yesterday without a problem and pushed the up switch to raise the bed. It moved at a snail's pace. This has never happened before. It also moves up quite quickly. It has sat in the driveway for several weeks without being started and the temperature was 30F.

    Any thoughts?

  2. Landrus2

    Landrus2 LawnSite Fanatic
    Messages: 5,020

    The hydraulic oil got to thick you are back in bushiness when temperatures rise not to worrier :drinkup:
  3. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 26,801

    Did you look at the volt meter when raising?
  4. Markf

    Markf LawnSite Senior Member
    Messages: 406

    NO. Will do and let you know. Would it matter if the truck is running or not? I assume that if there is a problem, I should see a major drop in the volt meter. Correct?
  5. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 26,801

    If the volt metor nosedives it is probably time for a new battery. If battery is somewhat new it just may be weak, you did say it hasnt been run in a while , correct?
  6. AceFinish

    AceFinish LawnSite Member
    Messages: 98

    Yah check the battery first which if it is bad will help the lifting power but it sounds like the fluid is cold this happens every year to our trucks because our shop where we store our dump trucks is not heated. Once the fluid heats up you will be golden.
  7. Markf

    Markf LawnSite Senior Member
    Messages: 406

    If the oil is too thick from being cold, wouldn't that stop machinery (e.g. backhoes) from functioning on a cold day?

  8. PORTER 05

    PORTER 05 LawnSite Senior Member
    Messages: 642

    same thing happened in our 89 dump - we where doing clean-ups when it was very cold out---

    i then checked the hydro-fluid and it was almost gone, so i put in 2 full QTS and it still dint top it off, but it started working perfect! , but the temp had come up to about 40 though......

    nothing works in the cold...

    plus you shouldnt let the truck sit all that time and not run it, + it being a diesel.
  9. SpruceLandscape

    SpruceLandscape LawnSite Senior Member
    from ohio
    Messages: 502

    Was probably a combination of the truck sitting for a while in the cold and the battery being week. Did you try to cycle the dump right after you started it? This could also have been part of the problem if the glow plugs were still cycling, the truck was cold, battery was discharged, and then you put another big load on it by trying to operate the dump. Also, the fluid could have been a little bit thick which makes the electric motor work harder. Did it sound normal? could you tell if the electric motor sounded a little slower? or was there maybe some air in the pump that didn't purge out since its been sitting a while? All these could be factors, but you should check the hydraulic fluid to be on the safe side.
  10. laird006

    laird006 LawnSite Member
    Messages: 169

    Check the fluid level. Mine will go up slow and actually start surging when it gets low.

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