Doosan D80S-7 - Engine Oil & Filter (Diesel Engine Only) - Change; Fuel Trim Valve (FTV) Inspection (LP Engine Only); Inspect Electrical System (LP Engine Only); Inspect Vacuum Lines and Fittings (LP Engine Only)

Maintenance Section
232
Engine Oil & Filter
(Diesel Engine Only) - Change
Diesel Engine Crankcase
See topic, "Engine Oil & Filter (Diesel E/G Only) -
Change" in "First 50-100 Service Hours or a Week".
Inspect Vacuum Lines and Fittings
(LP Engine only)
 Visually inspect vacuum lines and fittings for
physical damage such as brittleness, cracks
and kinks. Repair/replace as required.
 Solvent or oil damage may cause vacuum lines
to become soft resulting in a collapsed line while
the engine is running.
 If abnormally soft lines are detected, replace as
necessary.
(1) LP fuel lock-off,
(2) LP regulator/converter
(3) Fuel Trim Valve(FTV) : LP only)
(4) LP mixer
(5) Vacuum lines,
(6) Coolant lines,
(7) LP fuel line
Fuel Trim Valve (FTV) Inspection
(LP Engine only)
 Visually inspect the Fuel trim valve(3) for
abrasions or cracking. Replace as necessary.
 To ensure the valve is not leaking a blow-by test
can be performed.
1. With the engine off, disconnect the electrical
connector to the FTV.
2. Disconnect the vacuum line from the FTV to the
pressure regulator/converter, at the converter’s
tee connection.
3. Lightly blow through the vacuum line connected to
the FTV. Air should not pass through the FTV
when de-energized. If air leaks past the FTV
when de-energized replace the FTV.
Inspect Electrical System
(LP Engine only)
 Check for loose, dirty or damaged connectors
and wires on the harness including: Fuel lock-off,
TMAP sensor, O2 sensor, Electronic throttle,
Control Relays, Fuel Trim Valve, Foot Pedal,
and Distributor sensor.
 Repair and/or replace as necessary
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