Doosan D20S-5 Operation & Maintenance Manual page 100

Operation Section Operation Section
Problem Problem
Poor High Speed Poor High Speed
Performance Performance
(Gas) (Gas)
Problem Problem
Poor High Speed Poor High Speed
Performance Performance
(Gas) (Gas)
Probable Probable Cause Cause
Isolate the gasoline system by Isolate the gasoline system by
running the lift truck on LPG running the lift truck on LPG
Clogged fuel Clogged fuel filter filter
Plugged fuel Plugged fuel line line
Air Air filter filter clogged clogged
Faulty vapor connection between Faulty vapor connection between
the the pressure pressure regulator/converter regulator/converter
and the mixer and the mixer
Pressure Pressure regulator regulator malfunction malfunction
Probable Cause Probable Cause
Air/Fuel Air/Fuel Mixer Mixer malfunction malfunction
Restricted Restricted exhaust exhaust system system
Incorrect ignition control Incorrect ignition control
Incorrect air/fuel control Incorrect air/fuel control
Incorrect throttle position Incorrect throttle position
-97- -97-
Corrective Action Corrective
Verify LPG cylinder is full and valve is open. Verify LPG cylinder is full and valve is open.
If the problem does not exist in LPG mode If the problem does not exist in LPG mode
proceed with the corrective action steps proceed with the corrective action steps
below. below.
If the problem also exists in LPG mode then If the problem
the root cause is most likely to be the root cause is most likely to be
something other than the fuel system something other than the fuel system
See Advanced Diagnostics & Dual Fuel See Advanced Diagnostics & Dual Fuel
Engine Service Manual Engine Service Manual
Repair/replace as Repair/replace
See Maintenance section, Fuel Filter See Maintenance section, Fuel Filter
 
replacement replacement
Remove Remove obstruction obstruction from
Close liquid fuel valve Close liquid fuel valve
 
Using caution, disconnect the fuel line Using caution, disconnect the fuel line
 
(some propane may escape) (some propane may escape)
Clear obstruction with compressed air Clear obstruction with compressed air
 
Re-connect fuel line Re-connect fuel line
 
Slowly open liquid fuel valve & Leak Slowly open liquid fuel valve & Leak
 
test test
Check air Check air filter filter
Clean/replace as required Clean/replace as required
 
Check connection Check connection
Verify no holes in hose Verify no holes in hose
 
Clamps must be tight Clamps must be tight
 
Look Look for for
 
collapsed hose collapsed hose
Test Test pressure pressure regulator
See Dual Fuel Engine Service Manual See Dual Fuel Engine Service Manual
 
Corrective Action Corrective
Check mixer Check mixer
See Engine Service Manual See Engine Service Manual
 
Check exhaust Check exhaust system
Measure exhaust back pressure Measure exhaust back pressure
 
See See Advanced Advanced
Service Manual Service Manual
Action
also exists in LPG mode then
as required required
from the the fuel fuel line line
kinked, kinked, pinched pinched and/or and/or
regulator operation operation
Action
system
Diagnostics Diagnostics & & Engine Engine