Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Cylinder doesnt extend fully up and down

Cylinder doesnt extend fully up and down

Cylinder doesnt extend fully up and down

I have a problem with a hydraulic cylinder which is working on 3 way proportional valve as i have attached in the pic.. Some time the hydraulic cylinder doesn't go fully up or fully down. It moves up and down but doesnt reach the top and bottom limit switches. I see the pump is loaded the valves are set.It is working since 4 years. What could be the problem. Also can you guys explain the 3 way proportional valve in the diagram

RE: Cylinder doesnt extend fully up and down

Two limit switches or one position sensor?
The schematic indicates a position sensor on the cylinder...

RE: Cylinder doesnt extend fully up and down

Yes. Only one position transducer but some times it doesn't fully extend or retract

RE: Cylinder doesnt extend fully up and down

Resposted here using the so others don't have to kick all the hassles.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Cylinder doesnt extend fully up and down

Well without knowing any real details your options seem to be:

Your Position Sensor isn't calibrated properly
Your hydraulic supply pressure is lower than you need for the load ( passing relief valve?
Your load become greater than the applied load from the cylinder
Your cylinder has a leak in it
The signal to the proportional valve is incorrect

a proportional valve supplies fluid flow in proportion to some incoming signal - whether hydraulic or a signal. https://www.hydraulicspneumatics.com/other-technol...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Cylinder doesnt extend fully up and down

Maybe You can upload a video of the problems to youtube and we might be able to tell you what might be the problem.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close