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.
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G420FE engine;
Stock maximum is 213PSI
Stock minimum is 199PSI
Max diffenerence is 14.2 PSi
The G424 engine (16 valve hyundai);
Max compression 185 Psi
Min compression 164 Psi
tolerance between cylinders 15 Psi
Ratio 10.5:1
Do you know the compression psi for the Doosan lift trucks?
Thanks, I will look into those things.
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.
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