Doosan (& Daewoo) GC25S-3:
trouble no power steering

i have a 1998 daewoo gc25 s-3 , when i bought it it had power steering , but seemed like it had air in the system because it would steer , pretty good then , steering got harder to turn , i noticed the hydraulic tank on side of truck the tank was 190 degrees , so i opened the hydraulic tank and the filters seemed clean , someone told me there must be a blockage somewhere, so i took to forklift to repair shop they put in a new orbital , still no steering , so they rebuilt the hydraulic master cylinder , still no steering , then they put new hydaulic pump on the truck , still no steering , they checked pressure at the orbital but only went up to about 5 psi , then they took the gauge off and started it fluid shot out , but no pressure , anyone else ever have this problem on this model daewoo , we dont know what else to try to fix the steering on this unit , if you lift the back of the forklift up the steering can be turned side to side , by moving the wheels back and forth by hand, any help would be greatly appreciated thank you , serial numbe is 95-00658
  • Posted 16 Dec 2022 07:42
  • Modified 16 Dec 2022 07:51 by poster
  • Discussion started by jtt81968
  • New Jersey, United States
Showing items 1 - 4 of 4 results.
I have virtually the same problem on the same machine. Steering ability is absent, but rarely it will come back fully for a while. I thought it was the orbitrol at first, but they are discontinued, which may be a good thing. My LS seems to go to the brake valve. Could that be the problem?
Any chance that you could send me that schematic too? You might save me from taking years off my life.
  • Posted 28 Aug 2024 07:29
  • Reply by Don_MacKillop
  • Alberta, Canada
djm
Check your email! Happy Holidays!

LS is the load sensing line, coming from the orbitrol, wich actuates the priority valve on the pump.
  • Posted 23 Dec 2022 19:14
  • Reply by Speedfreak
  • Niederlande, Netherlands
.
thank you for your advice , but what is a ls the Ls line , is that the low side meaning low pressure side thanks and happy holidays to you
  • Posted 23 Dec 2022 11:44
  • Reply by jtt81968
  • New Jersey, United States
Priority valve, mounted on the engine driven hydraulic oil pump.
P/N D516514
It's being controlled by the LS line coming from the orbitrol.
Worth checking if it's not blocked between orbitrol and priority valve (could be a steel line-not sure, it's been awhile since i've worked on those)

The orbitrol acts like a small pump, therefore-with drive wheels off ground_ it will deliver enough oil to steer, could be the PSI that was measured.

Pump is easily tested; when the lifting works pump is fine, the priority valve could be stuck or not getting an LS signal from teh orbitrol.
Normally a visual check of the PV is done by lifting at a steady speed, when steering the lifting motion should be decreased during steering.

Good luck!
  • Posted 21 Dec 2022 01:03
  • Reply by Speedfreak
  • Niederlande, Netherlands
.

Post your Reply

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Having trouble using the Discussion Forums? Contact us for help.

Movers & Shakers
David Nicoll David Nicoll
Chief executive officer, Sany America
Chief executive officer - materials handling solutions, Josts Engineering
Global head of motive power marketing, EnerSys
Group business development and marketing manager, Wallem Group
Global Industry News
edition #1196 - 12 September 2024
As appetite for low-emission and zero-emission vehicle options continues to grow, so too does the technology as evidenced by the recent delivery of the prototype of the first hydrogen-powered reachstacker arriving at the Spanish Port of Valencia... Continue reading
Upcoming in the editorial calendar
FORKLIFT DAMAGE PREVENTION
Nov 2024
AGV FORKLIFT MANUFACTURERS
Feb 2025
Terberg YT223-4X2
Balling, Denmark
Used - Sale
Tusk 350CGH20
Coraopolis, Pennsylvania, United States
Used - Sale & Hire
Upcoming industry events …
September 27, 2024 - Brisbane, Australia
December 3-4, 2024 - Chicago, United States
March 26-29, 2025 - Shenzhen, China
Fact of the week
Yoghurt gained popularity as health food when in 1904 the scientist Elie Metchnikoff claimed that eating yoghurt might slow the ageing process. He attributed the longevity of Bulgarian peasants to their yoghurt consumption.