Doosan DX60R Shop Manual page 343

The EGR system uses steel gaskets at the joints between
its components/parts. These steel gaskets are specific to
the respective joints. When you remove the system's
components/parts and reinstall them, replace the steel
gaskets between them with new correct ones.
1. Drain the engine cooling water.
2. Remove the battery cable from the battery's
3. minus (-) terminal.
4. If there is any additional equipment (such as an air
cleaner) installed above the EGR valves, remove it in
advance.
5. Remove the EGR valve connectors.
6. Disconnect the cooling water inlet and outlet hoses from
each EGR valve by loosening the hose clips. When
loosening the clips, put waste cloth or the like beneath the
hose joints in case water leaks.
4TNV98-E
1. Loosen the nuts in the coupling flanges of the exhaust
manifold and the EGR pipe.
2. Loosen the bolts in the coupling flanges of the EGR pipe
and EGR valve, and remove the EGR pipe.
3. Remove the EGR valve.
Inspecting/Cleaning EGR Related Components
EGR Valve
Each EGR valve has four built-in coils. The power to each of the
four coil is either ON or OFF at any given time. Depending on
which coil is ON and which coil is OFF, the step motor rotates to
determine the valve lift. The power to each coil is turned ON/
OFF by the E-ECU based on the engine speed and fuel
injection rate. The resistances of these coils should be as
specified below when measured between each pair of pins
shown. If any of the actually measured values is beyond the
standard range, replace the entire EGR valve assembly.
Engine
CAUTION
Figure 236
Figure 237 EGR valve connectors
SP001693
Page 163