Doosan D50S-5 Operation & Maintenance Manual page 91

Mixer Idle Screw / Powe Mixer Idle Screw /
(G643 Engine Only) (G643 Engine Only)
• •
Forklift have U Forklift have Unstable Idle RPM, You can adjust
idle screw. Idle Screw turn to rich side (turn in n idle screw. Idle Screw turn to rich side (turn i
Vacuum leak Vacuum leak
Pressure regulator Pressure regulator
malfunction/fuel pressure too high malfunction/fuel pressure too high
Faulty FTV Faulty FTV
(G643E only) (G643E only)
Weak ignition and/or spark control Weak ignition and/or spark control
Incorrect air/fuel control Incorrect air/fuel control
Exhaust system Exhaust system leaks
Oxygen sensor Oxygen sensor failure
Power Valve Adjust r Valve Adjust
nstable Idle RPM, You can adjust
Check system vacuum hoses from regulator Check system vacuum hoses from regulator
to FTV and mixer to FTV and mixer
Test pressure regulator operation Test pressure regulator operation
Check Check
obstructions obstructions
See Advanced Diagnostics See Advanced Diagnostics
See Advanced Diagnostics See Advanced Diagnostics
leaks Repair exhaust Repair
failure Replace as Replace
90 90
Clean/replace as required Clean/replace as required
 
Repair/replace as necessary Repair/replace as necessary
 
See Engine Service Manual See Engine Service Manual
 
FTV FTV for for housing housing
See Advanced Diagnostics FTV See Advanced Diagnostics FTV
 
operation operation
Repair and/or replace as necessary Repair and/or replace as necessary
 
exhaust system system
as necessary necessary
See Advanced Diagnostics See Advanced Diagnostics
 
Operation Section Operation Section
cracks cracks or or