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Curtis B.
Curtis B., Technician
Category: Industrial Equipment
Satisfied Customers: 668
Experience:  Technican turned service manager on multiple lines of equipment used in industry.
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I have a JLG 600AJ serial# 300062841 When in drive gh it

Customer Question

I have a JLG 600AJ serial####-##-####When in drive high it moves about 6 inches and then it just stops and in low torque it will move but as soon as 1 tire hits a door way or any kind of a ground difference it locks down,if you move it in the opposite direction it will move about the same and you can rock it back and forth about 6 inches each way. I lifted it off the ground and it works fine. I have replace the collector seals.
Submitted: 11 months ago.
Category: Industrial Equipment
Expert:  Bradley Martin replied 11 months ago.

Is this lift electric or gas powered?

Customer: replied 11 months ago.
Diesel
Expert:  Bradley Martin replied 11 months ago.

Have you done any pressure checks at the drive motor? Do you have any fault codes?

Customer: replied 11 months ago.
All pressures are good no fault codes
Expert:  Bradley Martin replied 11 months ago.

It sounds like one of the drive motors is bad when it stops does one of the wheels try to move does it bog the engine down

Customer: replied 11 months ago.
That's what's odd the engine never bogs at all. It drives on smooth services but if it has a bump or a small lip on a slab it just stops.
Expert:  Bradley Martin replied 11 months ago.

Have you tried disengaging one wheel at a time and see if it continues this does your model have the torque hubs on the drive wheels

Expert:  Bradley Martin replied 11 months ago.

Does all other functions operate at normal speed?

Expert:  Bradley Martin replied 11 months ago.

Have you tried the platform drive override switch when it stops could be a issue with a switch causing it to stop

Customer: replied 11 months ago.
I tried that but no difference and everything else works great
Customer: replied 11 months ago.
Where's the override?
Expert:  Bradley Martin replied 11 months ago.

Right hand top corner should have a green sticker above it