Doosan D35C-5 - Page 97

Operation Section
-95-
Problem Probable Cause Corrective Action
Engine Stalls
Fuel Lock-off malfunction Repair/replace Fuel Lock-off
z Se
e
Engine Service Manual
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Pressure regulator freezes Check level in cooling system
z Must be full, check coolant strength
z -35F minimum
z Check coolant hoses
z Watch for kinks and/or pinched hoses
z Verify one pressure hose and one
return hose
Pressure regulator malfunction Test pressure regulator operation
z Se
e
En
g
ine Service Manual
Vacuum leak Check for vacuum leaks
z Between mixer and throttle body
z Between throttle body and intake
manifold
z Between intake manifold and cylinder
head
Air/Fuel Mixer malfunction Check mixer
z Se
e
Engine Service Manual
Engine Mechanical See Engine Manufacturers Service Manual
Rough Idle
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Pressure regulator malfunction Test pressure regulator operation
z See Engine Service Manual
Vacuum leak Check for vacuum leaks
z Between mixer and throttle body
z Between throttle body and intake
manifold
z Between intake manifold and cylinder
head
Air/Fuel Mixer malfunction Check mixer
z See Engine Service Manual