Crown FC 4500 AC DRIVE:
Will not lower completley

I have a 4500 fc that will not lower all the way i have checked for any obstruction , binding of rollers but not able to locate the cause. I can raise the truck to main hieght when i lower it down last 4 inches of cylinder wont lower. It seems as though the right cyl. wants to lower but the left wont budge. Any help would be greatly appreciated.
  • Posted 4 Aug 2012 03:24
  • Discussion started by stucktruck
  • New Jersey, United States
Showing items 1 - 5 of 5 results.
Thanks for the support Swoop, I started a new post (lifting Problem) I also sent you the machine detail on your gmail account please review,

again thanks a lot.
  • Posted 17 Nov 2015 05:56
  • Reply by qasim_a
  • Sindh, Pakistan
Qasim Afridi
Hello Quasim,
I will suggest to make sure nothing is in the roller tracks first.
Then i will ask does the pump motor still run when it stops lifting? Or does it shut off, slow down or what?
Need more details to give better suggestions.
But i would suggest starting a new post thread dedicated to your specific problem.
  • Posted 17 Nov 2015 05:44
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Hello Swoop, my crown FC4520-2.5 having lifting problem, when the fork cross to the free lift (Initial mast) it's stop, not showing any error code.

waiting for your help.
  • Posted 17 Nov 2015 00:30
  • Reply by qasim_a
  • Sindh, Pakistan
Qasim Afridi
Thanks swoop ,you nailed it the cheezy snap ring came out causing spring to break which would not allow it to lower all the way. Thanks again
  • Posted 21 Aug 2012 04:04
  • Reply by stucktruck
  • New Jersey, United States
i'm not sure who manufacture's these masts or cylinders for crown but i have seen in certain cases where they put a safety valve in the bottom of the cylinder and have seen these valves come out because of snap ring failure. This might be your problem, if the valve is sitting in the base of the cylinder it could be keeping it from lowering all the way down.

The only other thing i can think of would be something catching in the mast channels but you already said you checked for that. So that is what makes me think it is something inside the cylinder.

The best say to test to see if its one cylinder is to block and chain up the mast and take the cylinders loose at the top where they are bolted to the innerchannel and then lower them down and see if both of them get stuck at the 4inches or if it is what you suspect, that only one is hanging up.

WARNING: If you are not familiar with working on masts and do not have the proper equipment to chain and block up the mast then call a qualified service person to do this for you. Working on masts is an EXTREMELY DANGEROUS task and should ONLY BE DONE by a qualified person.
  • Posted 4 Aug 2012 04:25
  • Modified 4 Aug 2012 04:28 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!

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