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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