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Older Skyjack SJ-6826 only works with Ground Controls - Platform controls turn electric motor but no hydraulics

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Shoe3669

Active Member
Joined
Jul 30, 2023
Messages
34
Location
KC
I've got a 90's Skyjack SJ-6826 rough-terrain scissor lift that has suddenly started giving me problems with the platform controls. The joystick will engage the electric motor, I can see and hear it spinning, but it does not work the hydraulics at all - expect for the 'lowering' function; when I use the ground control switch to raise the platform (works with no issue, raises quickly and sounds strong), the joystick will still engage the lowering function, but anything else just spins the electric motor.

I've tried plugging the joystick controls into the lower connector to remove a pretty significant length of harness wiring from the picture, and no change. Any thoughts?
 
E

ElectricalRoadTech

New Member
Joined
Jul 11, 2024
Messages
1
Location
Southwestern, Pa USA
Shoe3669 said:
I've got a 90's Skyjack SJ-6826 rough-terrain scissor lift that has suddenly started giving me problems with the platform controls. The joystick will engage the electric motor, I can see and hear it spinning, but it does not work the hydraulics at all - expect for the 'lowering' function; when I use the ground control switch to raise the platform (works with no issue, raises quickly and sounds strong), the joystick will still engage the lowering function, but anything else just spins the electric motor.

I've tried plugging the joystick controls into the lower connector to remove a pretty significant length of harness wiring from the picture, and no change. Any thoughts?
Click to expand...
Go to their website, https://techpub.skyjack.com search your model. There are 5 different manuals for servicing the lift. Have your serialnumber handy
I had one brought into our shop with similar issues as yours. If it has all of the relays mounted on the door start in there. Corrosion or loose leads are common. The relays should operate with each directional function, up/down, left/right steer, forward/reverse. I used the wiring diagram on the website and figured out how it was to work. Have fun!
 
Last edited:
S

Shoe3669

Active Member
Joined
Jul 30, 2023
Messages
34
Location
KC
ElectricalRoadTech said:
Go to their website, https://techpub.skyjack.com search your model. There are 5 different manuals for servicing the lift. Have your serialnumber handy
I had one brought into our shop with similar issues as yours. If it has all of the relays mounted on the door start in there. Corrosion or loose leads are common. The relays should operate with each directional function, up/down, left/right steer, forward/reverse. I used the wiring diagram on the website and figured out how it was to work. Have fun!
Click to expand...
That’s awesome, thanks for the link!
 
D

DJones84

New Member
Joined
Feb 20, 2025
Messages
3
Location
chattanooga tn
check the wiring connections in those crappy little white power strips. they are bad about coming loose and causing all kinds of issues, just ran into that problem with a skyjack 3219 scissor yesterday.no drive functions but motor spinning. found the red/white wire from strip to 24v contact barley connected
 
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