407913-2420 ZEXEL CONTROL UNIT Cross 4079132420

Image1.1.1
4) Remove the 90 degree pressure line fitting under the sensor box.
5) Remove the 90 degree pressure line fitting from the DPF center section that is closest to the outlet side.
6) The new pressure line that will fit into the DPF center section will need to be installed into the port in which the thermocouple was fitted. The existing thermocouple will need to be fitted into the port in which the old pressure line was fitted.
Swapping of the ports is only necessary on the outlet side of the center section.
Image1.2.1
Image1.2.2
7) Install the 7W-3556 washer on the 304-8042 straight fitting. Install the straight fitting into the DPF pressure port (towards the outlet side) in which the thermocouple was previously installed, tighten to a torque of 24 +/- 4 Nm (212 +/- 35 lb-in). Screw the 2N-8142 tee fitting onto that straight fitting and tighten to a torque of 24 +/- 4 Nm (212 +/- 35 lb-in).
Image1.3.1
8) Replace the O-ring on the sensor box where the old 90 degree pressure line fitting was located. Install the 4S-4857 tee fitting in the sensor box to a torque of 11 +/- 1 Nm (97 +/- 9 lb-in).
Image1.4.1
9) Where applicable, perform Service Letter REBE3391 at this time.
10) Install sensor box bracket and existing heat shield. Tighten all six bolts to a torque of 12 +/- 3 Nm (106 +/- 27 lb-in).
11) Install sensor box, new pressure lines (tube assemblies), thermocouples onto DPF, and cable straps.
Reference appropriate Disassembly and Assembly manual for proper torque and use of anti-seize.
Image1.5.1
12) Start the engine and use CAT ET to ensure that the status parameter Diesel Particulate Trap #1 Differential Pressure has a value greater than zero. Also, ensure status parameters Diesel Particulate Trap #1 Intake Temperature, and Diesel Particulate Trap #1 Outlet Temperature show reasonable values and increase with the rising exhaust temperatures.