Doosan D35C-5 - Page 98

Operation Section
-96-
Problem Probable Cause Corrective Action
Rough Idle
Incorrect Idle speed control See Advanced Diagnostics & See Engine
Service Manual
Incorrect timin
g
or spark control
Engine Mechanical See Engine Service Manual
High Idle Speed
Incorrect Idle speed control See Advanced Diagnostics & See Engine
Service Manual
Throttle sticking
Foot pedal sticking or incorrect
pedal signal
Check pedal return spring travel for binding
z See Advanced Diagnostics
Poor High Speed
Performance
Clogged fuel filte
r
Repair/replace as required
z See Maintenance section, Fuel Filter
replacement
Plugged fuel line Remove obstruction from the fuel line
z Close liquid fuel valve
z Using caution, disconnect the fuel line
(some propane may escape)
z Clear obstruction with compressed air
z Re-connect fuel line
z Slowly open liquid fuel valve & Leak
test
Air filter clogged Check air filter
z Clean/replace as required
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 Se
e
Engine Service Manual
Air/Fuel Mixer malfunction Check mixer
z Se
e
En
g
ine Service Manual
Restricted exhaust system Check exhaust system
z Measure exhaust back pressure
Incorrect i
g
nition control
See Advanced Diagnostics & See Engine
Service Manual
Incorrect air/fuel control
Incorrect throttle position