Doosan DX60R Shop Manual page 345

Cleaning the EGR Valves
Fume / Burn Hazard!
Always read and follow safety related precautions found on
containers of hazardous substances like parts cleaners,
primers, sealants and sealant removers.
Failure to comply could result in death or serious injury.
FLYING OBJECT HAZARD!
Always wear eye protection when servicing the engine and
when using compressed air or high-pressure water. Dust,
flying debris, compressed air, pressurized water or steam
may injure your eyes.
Failure to comply may result in minor or moderate injury.
The EGR valves must be periodically cleaned every 1500 hours
because, as exhaust gas circulates through them for a
prolonged time, carbon is deposited on their inner surfaces,
possibly deteriorating the EGR ratio.
To remove deposited
(0.19MPa(2kg/cm2) or lower). If the valves are heavily fouled,
use carbon cleaner, kerosene, or some other liquid capable of
removing carbon as well as a soft brush to clean the valves,
taking care not to damage their parts.
When cleaning the valves, take extreme care to prevent water,
solvent, cleaner, and other liquid from entering into the motor
and coupler terminals; otherwise, failure may result.
NEVER use high-pressure water or compressed air at
greater than 28 psi (193 kPa; 19 686 mmAq) or a wire brush
to clean the radiator fins. Radiator fins damage easily.
Engine
WARNING
CAUTION
carbon, use compressed
CAUTION
Figure 238
Figure 239
air
FG009153
FG009152
SP001693
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