Doosan (& Daewoo) GC30S-2:
Improper Lift Operation

I have a "head scratcher" here fella's any help would be much appreciated. We have a Daewoo GC30s-2 that has a lift issue. With no load on the forks the 1st stage of the mast completes its full travel to the top before the second stage begins to travel upward just as it should. However, when forks are loaded, the second stage will begin to travel upward when the first stage is only about 6 inches off the floor. All the stages then telescope as they continue to full travel.
  • Posted 16 Feb 2018 21:01
  • Discussion started by jalm
  • Minnesota, United States
Showing items 1 - 2 of 2 results.
Appreciate the info. I pulled the cylinder to see if they use a check valve to control flow and there is one in the inlet port but I think it's a safety valve for controlling carriage descent in case of say, a hose failure. I'm leaning more towards your worn cylinder theory. Thanks for taking the time to respond.
  • Posted 17 Feb 2018 05:22
  • Reply by jalm
  • Minnesota, United States
Sounds like a problem in the free lift cylinder. If you have a parts breakdown, check to see if there is a check valve in the base of the free lift cylinder ram. If not you may have a worn wear ring in the cylinder.
  • Posted 17 Feb 2018 03:57
  • Reply by BREWSKI
  • Nebraska, United States

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.

Fact of the week
On average, people read 10-30% slower from a screen than from paper.
Latest job alerts …
Dubuque, IA, United States
Louisville, KY, United States
Louisville, KY, United States
Autolift E180AT36B-D5-180
Coraopolis, Pennsylvania, United States
Used - Sale & Hire
UN Forklift FGL18T
HANGZHOU, Zhejiang, China
New - Sale
Movers & Shakers
Linda Häkkilä Linda Häkkilä
vice president, Investor Relations, Konecranes
vice president operations, Elokon Group
President, EP Equipment Europe
Senior vice president human resources, Kalmar
Upcoming industry events …
May 09-11, 2025 - Bangalore, India
October 21-23, 2025 - Panama City, Panama
July 15-17, 2025 - Hong Kong, Hong Kong
Fact of the week
On average, people read 10-30% slower from a screen than from paper.