Mitsubishi FB20KT:
FB20KT - Hydraulic problem.

I have a problem with a customers FB20KT, It has the finger tip controll.
Some times the hydraulic doesent work. The pump motor starts and it sounds like when you tilt ore lift to the max. But nothing happens, If I press the emergensy botton and release it the hydraulics works again.

When the problem occur non of the four functions work, so its not a problem with a ft lever and since the pump motor starts im thinking that the problem has to be in the Hydraulic manifold? Can it be a valve wich is fixed open so the oil runs back to the tank? Even when it runs good I think its a strange screaming noice from the system..

Have anyone had the same problem? I would like to hear your thoughts on this!

Thanks.
  • Posted 4 Dec 2008 04:09
  • Discussion started by staffan_e
  • Skaraborg, Sweden
Showing items 1 - 9 of 9 results.
Hi anyone know if this relay will stop all the finger tip controls working as all my controls have stopped but there is plenty of pump pressure my model is a 1990 fg15 serial number starting f25a the seat switch is bypassed best regards Greg
  • Posted 4 Jun 2012 08:12
  • Reply by woollamia
  • New South Wales, Australia
Thank you for letting me know, much appreciated. I had forgotten all about it since it was last December when I emailed you! thanks again.
  • Posted 1 Oct 2009 03:44
  • Reply by Irish
  • Cork, Ireland
Im just lifting this thread to tell you what the problem was.

In the fingertip armrest there are two big relays, one of these relays should be replaced with a new smaller kind of relay with part nr 9700502400. It comes with a connector that fits into the existing harness.

You can see wich of the relays you should change if you check the cables in the connectors ones you have the new part.

This solved the problem for me!
  • Posted 23 Sep 2009 04:25
  • Modified 23 Sep 2009 04:26 by poster
  • Reply by staffan_e
  • Skaraborg, Sweden
Thanks for your answer! But I dont think its the pump, the forklift have worked ok since I posted here. Still waiting on the problem to come again so I can do some testing. The noice doesent come from the pump, its sounds like it comes from the hydraulic manifold.
  • Posted 23 Dec 2008 05:36
  • Reply by staffan_e
  • Skaraborg, Sweden
I would guess you need a new pump, I have replaced a few of these pumps in the past. I don't think the emergency button has anything to do with the fault because if the pump is making noise when you use the controls the chances are the problem is mechanical rather than electrical. Good luck.
  • Posted 23 Dec 2008 05:30
  • Reply by Irish
  • Cork, Ireland
Ok! I will check the pressure first and if I cant find the problem ill repost it there! Thanks!
  • Posted 5 Dec 2008 03:30
  • Reply by staffan_e
  • Skaraborg, Sweden
tell you the truth
the one i had did not have fingertip controls
you may have an issue with load holding solenoids or something too

try reposting this in the "technical arena" since more people will see it
  • Posted 4 Dec 2008 07:51
  • Reply by justinm
  • New York, United States
New York, New York its a heluva town..you know that The Bronx is up..and I'm Brooklyn down
Thanks for the answer Ill check the pressure.
Do you have any idea about why it works again after pressing and releasing the emergensy button?
  • Posted 4 Dec 2008 06:27
  • Reply by staffan_e
  • Skaraborg, Sweden
ive had one of these seize the pump
check the relief valve too

main relief pressure is 18142 kPa min you can have up to 490kPa extra (2631psi 71 -0)
if youre reading very low pressure the pump has a problem or if its real high the relief valve might have malfunctioned
  • Posted 4 Dec 2008 06:15
  • Reply by justinm
  • New York, United States
New York, New York its a heluva town..you know that The Bronx is up..and I'm Brooklyn down

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