SHIM 4900436 - Caterpillar

Illustration 3 g03771099
NRS valve
(7) NRS actuator assembly
(8) NRS valve body
Illustration 4 g03771103
NRS valve
(9) Point of rotation
Table 5
Troubleshooting Test Steps Values Results
4. Inspect the NRS Valve
A. Remove actuator assembly from NRS valve body.
B. Use a straight screwdriver to rotate the valve inside the NRS valve body. The valve should freely rotate from the open to close positions for 90 degrees of rotation.
Valve Rotates Freely
Result: NRS valve does not rotate at all, or the valve is difficult to rotate.
Repair: Replace the NRS valve body and install the actuator assembly that was previously removed.
Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position. Use Cat ET to perform an "EGR System Test" in