Doosan 7/72 - Page 73

69
PERIODICAL INSPECTI ON AND MAINT ENANCE.
7/72
Inspection every 1000 hours operation
(1) Replacing cooling water
Cooling water contaminated with rust or water scale - reduces the
cooling effect. Even when antifreeze agent (LLC) is mixed, the cooling
water gets contaminated due to deteriorated ingredients. Replace the
cooling water at least Once a year.
1) Remove the header tank cap.
2) Remove the bottom radiator hose of the radiator and drain the
cooling water.
3) After draining the cooling water, reconnect the hose.
4) Fill radiator and engine with cooling water via the header tank.
CAUTION:
Wait until the temperature goes down before draining the Cooling
water. Otherwise, hot water may splash to cause scalding.
(2) Adjusting intake / exhaust valve clearance
As this adjustment requires specialized knowledge and skill, consult
your Portable Power dealer . The adjustment is necessary to maintain
the correct timing for the opening and closing of valves. Neglecting the
adjustment will cause the engine to run noisily and result in poor engine
performance and other damage.
Inspection every 1500 hours operation
(1) Inspect, Clean and Test Fuel Injectors
As the adjustment requires specialized knowledge and skill, consult
your Portable Power dealer. This adjustment is needed to obtain the
optimum injection pattern for full engine performance.
(2) Inspect T urbocharger (Blower Wash as Necessary)
Turbo charger service is required by the EPA/ARB every 1500 hours.
Your authorized Portable Power dealer or distributor will inspect and
blower wash the unit if necessary.
(3) Inspect, Clean and Test EGR Valve
The EGR valve is a key component for cleaning exhaust gas.
To prevent the valve from deteriorating in exhaust gas recirculation
performance due to carbon accumulation, inspect, clean and test the
valve at least every 1500 hours. Consult your local Portable Power
dealer for this service.
(4) Inspect and Clean EGR Lead V alve
The EGR lead valve is located in the passage of recirculated gas.
To prevent carbon accumulation in or clogging of the lead valve, inspect
and clean the lead valve at regular intervals. Consult your local
Portable Power dealer for this service.
(5) Clean EGR Cooler
The EGR cooler is apt to be contaminated with rust and scale that
deteriorate the cooling performance. Carbon accumulation in the
exhaust gas passage of the cooler hinders circulation of exhaust gas,
resulting in deterioration in exhaust gas cleanup performance.
To prevent such a problem, clean the cooler at least every 1500 hours.
Consult your local Portable Power dealer for this service.
EGR cooler
EGR valve
EGR lead valve
(6) Inspect Crankcase Breather System
Proper operation of the crankcase breather system is required to
maintain the emission requirements of the engine. The EPA/ARB
requires that you have the crankcase breather system inspectedevery
1500 hours. See your authorized Portable Power dealer or distributor
for this service.