Doosan D35C-5 FDA04 Operation & Maintenance Manual page 112

Operation Section
Problem
Will Not
Accelerate/Hesita
tion During
Acceleration or
Engine Stalls
(Gas)
Rough Idle (Gas)
Probable Cause
Throttle butterfly valve not opening
or sticking
Foot Pedal signal incorrect or
intermittent
Incorrect air/fuel or ignition control
Engine Mechanical
Isolate the gasoline system by
running the lift truck on LPG
Pressure regulator malfunction
Clogged fuel filter
Pressure regulator malfunction
Fuel Injector malfunction
Vacuum leak
See Advanced Diagnostics
See Engine Service Manual
Verify LPG cylinder is full and valve is open.
If the problem does not exist in LPG mode
proceed with the corrective action steps
below.
If the problem also exists in LPG mode then
the root cause is most likely to be
something other than the fuel system
See Advanced Diagnostics & Service

Manual
Test pressure regulator operation
See Engine Service Manual

Repair/replace as required
See Maintenance section, Primary and

Secondary Fuel Filter replacement
Test pressure regulator operation
See Engine Service Manual

Test Injector operation
See Engine Service Manual

Check for vacuum leaks
Between mixer and throttle body

Between throttle body and intake

manifold
Between intake manifold and cylinder

head
-110-
Corrective Action