Doosan 7/73-10/53, Operation And Maintenance Manual

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MAINTENANCE 27
7/73 - 10/53
Clean the exterior of the filter housing and remove the filter element by
releasing the nut.
Inspection
Check for cracks, holes or any other damage to the element by holding
it up to a light source, or by passing a lamp inside.
Check the seal at the end of the element and replace if any sign of
damage is evident.
Reassembly
Assemble the new element into the filter housing ensuring that the seal
seats properly.
Reset the restriction indicator by depressing the rubber diaphragm.
Assemble the dust collector box parts, ensuring that they are correctly
positioned.
Before restarting the machine, check that all clamps are tight.
VENTILATION
Always check that the air inlets and outlets are clear of debris etc.
COOLING FAN DRIVE
Periodically check that the fan mounting bolts in the fan hub have not
loosened. If, for any reason, it becomes necessary to remove the fan
or re-tighten the fan mounting bolts, 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
General Information
The engine uses a dual filter system.
1. The pressure-side fuel filter is used for filtration only and is
pressurised by the gear pump mounted on the fuel pump.
2. The suction-side fuel filter is a fuel / water separator and is located
between the gear pump, mounted on the engine’s fuel pump, and
the original equipment manufacturer (OEM) fuel supply tank. This
filter is
not pressurised, but operates under a vacuum.
Fuel System Priming
A certain amount of air becomes trapped in the fuel system when fuel
system components on the supply and/or highpressure side are
serviced or replaced. Fuel system priming is accomplished using a
manual priming pump. For priming procedures, see the Prime step of
this procedure.
• Disconnect the batteries. See equipment manufacturer service
information.
• Clean the area around the fuel filter.
• If required, disconnect the wiring harness from the water-in-fuel
sensor.
CAUTION: NEVER clean by blowing air inwards.
1. Primary fuel filter / water separator (30 microns)
2. Secondary fuel filter (10 microns)