Engine Oil & Filter (Diesel Engine Only) - Change; Inspect Vacuum Lines And Fittings (Lp Engine Only); Fuel Trim Valve (Ftv) Inspection (Lp Engine Only); Inspect Electrical System (Lp Engine Only) - Doosan D60S-7 Operation & Maintenance Manual

Maintenance Section
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
6
3
2
(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
4
7
5
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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