Doosan (& Daewoo) GC20SC-5:
Machine will start on starting fluid NO Start

We have a GC20SC-5 and it has a hard time starting. It will start on starting fluid and run. Once you turn it off it will have a hard time starting again. You can also disconnect the vacuum line going from the mixer to the regulator and blow/suck into the line to activate the diaphragm in the regulator to get it to start. The machine has no codes and it seems to be a vacuum problem not allowing the diaphragm to work properly. Any help would be very appreciated. Thank you in advance.
  • Posted 3 Feb 2022 03:57
  • Discussion started by Shep
  • Utah, United States
J Shep
Showing items 1 - 4 of 4 results.
G420FE engine;
Stock maximum is 213PSI
Stock minimum is 199PSI
Max diffenerence is 14.2 PSi
  • Posted 8 Feb 2022 00:23
  • Reply by Speedfreak
  • Niederlande, Netherlands
.
The G424 engine (16 valve hyundai);
Max compression 185 Psi
Min compression 164 Psi
tolerance between cylinders 15 Psi
Ratio 10.5:1
  • Posted 8 Feb 2022 00:09
  • Reply by Speedfreak
  • Niederlande, Netherlands
.
Do you know the compression psi for the Doosan lift trucks?
Thanks, I will look into those things.
  • Posted 5 Feb 2022 07:52
  • Modified 5 Feb 2022 09:03 by poster
  • Reply by Shep
  • Utah, United States
J Shep
low compression would result in a lower vacuum while starting, when engine is running enough vacuum is available to operate the diaphragm.
I'd do a compression check first.
A minor crack/leak in the diaphragm would also give the result described.
  • Posted 3 Feb 2022 19:30
  • Reply by Speedfreak
  • Niederlande, Netherlands
.

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Fact of the week
In 1920 the Royal Australian Navy enlisted a six-year-old girl to give her urgent snake bite treatment onboard their ship. Regulations did not allow medical treatment on navy ships for civilians. The girl was given the rating 'mascot'. When she was discharged after eight days service, they recorded 'being required by her parents' as reason.
Fact of the week
In 1920 the Royal Australian Navy enlisted a six-year-old girl to give her urgent snake bite treatment onboard their ship. Regulations did not allow medical treatment on navy ships for civilians. The girl was given the rating 'mascot'. When she was discharged after eight days service, they recorded 'being required by her parents' as reason.