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Skyjack 3219 Scissor Lift Locks Up: Won't Drive or Lift

Discussion in 'Forklifts/Telehandlers' started by jpmtnman, Jun 19, 2014.

  1. jpmtnman

    jpmtnman New Member

    Joined:
    Jun 19, 2014
    Messages:
    1
    Location:
    Western Colorado
    Help!! We have a Skyjack SJIII 3219 scissor lift (Shipped 08/06) that I need help with troubleshooting. After the lift sits overnight I go to drive or raise the platform and the lift will work fine for a couple minutes and then I start having problems. The brake may not release for reverse but it will for forward or it may not release for either forward or reverse and the platform usually won’t raise again. The pump motor makes a bogging sound like a valve is not opening. Any advice on what to try is greatly appreciated.
    Thank you, Jeff
     
  2. BillG

    BillG Senior Member

    Joined:
    Mar 26, 2009
    Messages:
    351
    Location:
    S. Wisconsin
    Check the batteries, sounds like low voltage. Check the battery connections and connect a voltmeter to measure system voltage. Should read better than 24 volts at rest, and should hold pretty close to that with fully charged batteries. If you get a large drop check each battery the same way until you find the culprit.
     
  3. papabear8910

    papabear8910 Member

    Joined:
    Jul 12, 2015
    Messages:
    12
    Location:
    rancho cucamonga
    My 3219 will be driving and all of a sudden it will go to super slow motion like if the batteries were dead but I just had all four batteries replaced because the old ones stop holding a charge can some one help please
     
  4. Chris2011

    Chris2011 Member

    Joined:
    Jul 24, 2015
    Messages:
    6
    Location:
    Tyler,tx
    Bad batteries
     
  5. papabear8910

    papabear8910 Member

    Joined:
    Jul 12, 2015
    Messages:
    12
    Location:
    rancho cucamonga
    skyjack3219

    I checked all my battery's and they all check out fine they are brand new battery's maybe about month and a half old
     
  6. tool_king

    tool_king Senior Member

    Joined:
    Mar 29, 2010
    Messages:
    1,493
    Occupation:
    road mechanic owner
    Location:
    new jersey
    papabear8910
    Take a look at your pump motor and main motor contactor .If you where running the unit with the bad batteries .You would cause high amps . Also if the bushes are hanging up in the motor
    .It will give you issues.You can also have a cable breaking down under load .
     
    Last edited: Jul 27, 2015
  7. gray21

    gray21 Member

    Joined:
    Aug 5, 2015
    Messages:
    5
    Location:
    Saskatchewan, Canada
    As stated check your batteries and check voltage drop and load being given to the contactor solenoid. Check connections as well as the cables, i've had machines i've spent hours of tracing and overlooked a bad cable, check resistance or check to see if the cables are hard usually an indication that you've got some corrosion, i've found on some of these the pain power coming off the battery to the disconnect or down to the contactor having corrosion built up internally inside the cable. Good luck.
     
  8. papabear8910

    papabear8910 Member

    Joined:
    Jul 12, 2015
    Messages:
    12
    Location:
    rancho cucamonga
    I check all the wire replaced some of them and it still won't goes really slow fowerd and backwards and it also goes up really slow if the joystick is pressed all the way foward or backwards is their something wrong with my control box
     
  9. papabear8910

    papabear8910 Member

    Joined:
    Jul 12, 2015
    Messages:
    12
    Location:
    rancho cucamonga
    hello again i have another skyjack that i lost all communication with all the controls. does anybody have any idea what can cause this?
     
  10. Dustin Hampton

    Dustin Hampton New Member

    Joined:
    Jun 28, 2017
    Messages:
    1
    Occupation:
    Heavy Duty Mechanic
    Location:
    Calgary, Ab
    I recently had the same problem. The pump motor was not dying off at all, the batteries are new, it was fully charged. What I found was the joystick was intermittently failing. I would be travelling in full forward, and then suddenly it was like I was feathering in a slow travel position, but the joystick was still full forward. The new joystick solved the problem. of coarse, make sure those goofy skyjack plugs are clean and tight, and the harness is not compromised. They always get abuse at the plug.
     
  11. southernman13

    southernman13 Senior Member

    Joined:
    May 13, 2008
    Messages:
    592
    Occupation:
    Retired
    Location:
    Florida,Ga,Tn
    The controller may have a potentiometer on it and I may be going over center. Try pulling it back a little from full stoke and see if that works
     
  12. Geoff Lott

    Geoff Lott Member

    Joined:
    Oct 20, 2018
    Messages:
    12
    Location:
    Mississippi
    First off I’ve been dealing with skyJack for a while now...they suck....remove platform connector and attach to the one under the machine if problem goes away take the connectors that aren’t connected apart and verify no wires haven’t pulled out...this happens with skyjack all the time...the wire you are looking for for these symptoms is usually in pin 10 (white with black tracer)...if problem doesn’t go away then take all four connectors apart and check...also verifying they aren’t heavily corroded as Skyjack’s love water
     
  13. Geoff Lott

    Geoff Lott Member

    Joined:
    Oct 20, 2018
    Messages:
    12
    Location:
    Mississippi
    Here’s the top three things to check with these units....first off do yourself a favor and get a pair of pliers and a 11/32 wrench and loosen bolt and nuts on pothole switches and angle them as down as they will go...then tighten back....verify that when raising machine from ground level sensor goes to green..(will be red a green for a second)....then verify the plastic black cam by the ladder is tight and not loose or spinning....and if you are having slow lift function a good and quick place to check is that the emergency knob ( red anodized ) is in proper position...if it’s in position to emergency lower it will be extremely slow on lift
     
  14. Geoff Lott

    Geoff Lott Member

    Joined:
    Oct 20, 2018
    Messages:
    12
    Location:
    Mississippi
    Look if you have replaced batteries...ignore all these guys saying check batteries....Skyjack’s are 98% a wiring issue NOT related to batteries or their cables....best thing to try like I stated before is plug platform box to bottom of machine...start there