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Curtis B.
Curtis B., Technician
Category: Industrial Equipment
Satisfied Customers: 28910
Experience:  Technican turned service manager on multiple lines of equipment used in industry.
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I have a 20VP. One day the platform worked fine, now the

Customer Question

I have a 20VP. One day the platform worked fine, now the platform does not go up. Everything sounds the same and the lift will move. It's just the paltform
JA: What is the complete model and serial number of your machine?
Customer: JLG 20VP(###) ###-####JA: Are you fixing this yourself? What have you tried so far?
Customer: I would like to. I have checked the fluid levels
JA: Anything else you want the industrial mechanic to know before I connect you?
Customer: I have a manual for it. I was hoping that there would be some basic things to check to see if I can fix it or if I should have it serviced by someone else
Submitted: 2 months ago.
Category: Industrial Equipment
Expert:  Curtis B. replied 2 months ago.

Hello! Let's see if we can can work together to get to the root of your question!

Expert:  Curtis B. replied 2 months ago.

has an emergency lowering valve, has someone opened the valve? If valve is open, the system will not have pressure to raise the platform.

Customer: replied 2 months ago.
I located the emergency lowering valve. It was tight. I loosened it and then re tightened it. No change. I suspect the dump valve may be stuck open but I don't know how to address this.
Expert:  Curtis B. replied 2 months ago.

See page 2-13 in the parts manual link below. All the valves are in the power unit. You have outriggers, are they down? If outriggers are not set, lift will not raise.

Customer: replied 2 months ago.
Page 2-13 is a parts list and there are no outriggers mentioned on that page. It does have a pothole detection system
Expert:  Curtis B. replied 2 months ago.

Pothole detection is what I meant. I has no outriggers.

Customer: replied 2 months ago.
There is nothing down. I look underneath the lift and it seems very normal. I have looked at the bubbles in the two levels and they are in the center.
Expert:  Curtis B. replied 2 months ago.

Will the pothole bars move up or down? Are they making the switch close/open?

Customer: replied 2 months ago.
The pothole bars are down which is what I assume is normal. Pushing them up or pulling them down makes no difference. I can see the plunger switches and they seem to be working.
Expert:  Curtis B. replied 2 months ago.

Have you tested them with a meter?

Customer: replied 2 months ago.
I have not. Do you know where I would make a connection to test? I'm thinking that getting under the unit will be very difficult
Expert:  Curtis B. replied 2 months ago.

Is there a wiring diagram in the manual. I can't download it on this system. The wires from switches have to go to the control panel. locate the wires and test for continuity.