38
MAINTENANCE
9/275, 9/305, 12/250, 17/240, 21/220
VENTILATION
Always check that the air inlets and outlets are clear of debris etc.
COOLING FAN DRIVE
Periodically check that the fan mounting bolt in the fan hub has not
loosened. If, for any reason, it becomes necessary to remove the fan
or re-tighten the fan mounting bolt, apply a good grade of commercially
available thread locking compound to the bolt threads and tighten to
the torque value shown in the TORQUE SETTING TABLE later in this
section.
The fan belt(s) should be checked regularly for wear and correct
tensioning.
FUEL SYSTEM
The fuel tank should be filled daily or every eight hours. To minimise
condensation in the fuel tank(s), it is advisable to top up after the
machine is shut down or at the end of each working day. At six month
intervals drain any sediment or condensate that may have
accumulated in the tank(s).
FUEL FILTER MAINTENANCE
This compressor is equipped with 3 fuel filters in series to be
replaced at every 500 hr interval or sooner if required.
1. Primary Fuel Filter / Water Separator (30 microns).
2. Secondary Fuel Filter / Water Separator (10 microns).
3. Final Fuel Filter / Water Separator (3 microns).
Primary Fuel Filter / Water Separator
Mounted to the lifting structure on the separator tank side of the
compressor , this filter is capable of separating water from fuel and will
filter solid contaminants to 30 microns in size.
To be checked daily for the presence of water and drained if
required.
Replace:
Unscrew the fuel filter assembly from the head, remove
the plastic bowl and install on the new filter while taking care all seals
are in place.
Secondary Fuel Filter / Water Separator
Mounted to the lifting structure on the separator tank side of the
compressor, this filter is capable of separating water from fuel and will
filter solid contaminants to 10 microns in size.
Replace:
Remove the Water In Fuel sensor connector from the
bottom of the filter element, remove and discard the filter. Install a new
element taking care all seals are in place, install the sensor connector.
Final Fuel Filter / Water Separator
The final fuel filter (3 micron) is mounted on the engine. For
maintenance details, refer to the engine section of this manual.
FUEL FILTER WATER SEPARATOR
The fuel filter water separator contains a filter element which should
be replaced at regular intervals (see the SERVICE/MAINTENANCE
CHART).
CHARGE COOLER PIPEWORK
Inspect all hoses and clips on the charge cooler pipe work.
Engine damage will occur if the charge cooling system leaks.
HOSES
All components of the engine cooling air intake system should be
checked periodically to keep the engine at peak efficiency.
At the recommended intervals, (see the SERVICE/MAINTENANCE
CHART), inspect all of the intake lines to the air filter, and all flexible
hoses used for air lines, oil lines and fuel lines.
Periodically inspect all pipework for cracks, leaks, etc. and replace
immediately if damaged.
ELECTRICAL SYSTEM
When removing connectors from electrical devices and sensors,
inspect the terminals to ensure they have electrical grease on them. If
electrical grease is not present or very minimal, then add a small
amount of Doosan Part No. 22409114 electrical grease to the
terminals. Dirty and or corroded electrical terminals can be cleaned
using electrical contact cleaner.
Inspect the safety shutdown system switches and the instrument
panel relay contacts for evidence of arcing and pitting. Clean where
necessary.
Check the mechanical action of the components.
Check the security of electrical terminals on the switches and relays
i.e. nuts or screws loose, which may cause local hot spot oxidation.
Inspect the components and wiring for signs of overheating i.e.
discolouration, charring of cables, deformation of parts, acrid smells
and blistered paint.
CAUTION: NEVER clean by blowing air inwards.
WARNING: The Primary as well as Secondary filter elements
may be filled with the appropriate quality of fuel from a clean
source. NEVER fill the Final fuel filter before installing.
The correct procedure would be to fill Primary and Secondary
filters with clean fuel, leave the Final filter empty and prime the
system using the hand prime pump on the Primary filter head.
WARNING: Always disconnect the battery switch before
performing any maintenance or service.
