Doosan DX60R Shop Manual page 204

If the fuel filter / water separator is positioned higher than
the fuel level in the fuel tank, water may not drip out when
the fuel filter / water separator drain cock is opened. If this
happens, turn the air vent screw on the top of the fuel filter /
water separator 2-3 turns counterclockwise.
Be sure to tighten the air vent screw after the water has
drained out.
When the engine is operated in dusty conditions, clean the
air cleaner element more frequently.
Never operate the engine with the air cleaner element(s)
removed. This may allow foreign material to enter the
engine and damage it.
The maximum air intake restriction, in terms of differential
pressure measurement, must not exceed 0.90 psi (6.23 kPa;
635 mmAq). Clean or replace the air cleaner element if the
air intake restriction exceeds the above mentioned value.
It is important to perform daily checks.
Periodic maintenance prevents unexpected downtime,
reduces the number of accidents due to poor machine
performance and helps extend the life of the engine.
It the oil pump must be replaced, replace it as an assembly
only. Do not replace individual components.
Engine
Page 24
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
MEMO
SP001693