SEAL-SHAFT 1034755 - Caterpillar

Removal Procedure
Ensure that the nitrogen oxide sensor is not dropped or knocked. If the nitrogen oxide sensor, has been dropped or knocked the nitrogen oxide sensor must be replaced as an assembly.
Turn the battery disconnect switch to the OFF position.
Illustration 1 g03732053
Typical example
Cut cable straps (3) from harness assembly (4). Note the position of all cable straps for installation purposes. Note: Ensure that the harness assembly is not damaged as the cable straps are cut.
Remove nitrogen oxide sensor (2) from the Original Equipment Manufacture (OEM) exhaust tube assembly (1). Ensure that harness assembly (4) is not damaged as the nitrogen oxide sensor is removed. Place the probe of the nitrogen oxide sensor in a plastic bag and secure the plastic bag with a cable strap.
If necessary, follow Step 5.a through Step 5.b in order to remove nitrogen oxide sensor Electronic Control Module (ECM) (5) from bracket (8).
Disconnect OEM harness assembly (6) from the nitrogen oxide sensor ECM (5).
Remove bolts (7) nitrogen oxide sensor ECM (5). Remove the nitrogen oxide sensor ECM from bracket (8). Refer to OEM for further information. Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A - Bostik Pure Nickel
Anti-Seize Compound 1
B - 22 mm Crows Foot 1
Ensure that the nitrogen oxide sensor is free from wear or damage. Replace the nitrogen oxide sensor as an assembly if worn or damaged.
Check the threads of the mounting point for nitrogen oxide sensor in the OEM tube assembly for wear or damage. Replace the OEM tube assembly if the mounting point is worn or damage. Refer to the OEM for the correct procedure.
Illustration 2 g03732053
Typical example
If necessary, follow Step 3.a through Step 3.c in order to install nitrogen oxide sensor ECM (5) to bracket (8).
Position nitrogen oxide sensor ECM (5) onto bracket (8). Ensure that the nitrogen oxide sensor ECU is correctly orientated onto the bracket. Refer to OEM for further information.
Install bolts (7) to the nitrogen oxide sensor ECM. Support the nitrogen oxide sensor ECM as the bolts are installed. Tighten the bolts to a torque of 10 N m (89 lb in).
Connect OEM harness assembly (6) to the nitrogen oxide sensor ECM (5).
New nitrogen oxide sensor (2) are pre-lubricated. When installing an existing nitrogen oxide sensor (2), lightly lubricate the thread of the nitrogen oxide sensor with Tooling (A).
Remove the probe of nitrogen oxide sensor (2) from the plastic bag. Install the nitrogen oxide sensor to OEM exhaust tube assembly (1). Ensure that harness assembly (4) is not damaged as the nitrogen oxide sensor is installed. Note: Ensure that the nitrogen oxide sensor is not contaminated.
Use Tooling (B) to tighten nitrogen oxide sensor (2) to a torque of 50 N m (37 lb ft).
Install new cable straps (3) to harness assembly (4). Ensure that the cable straps are installed into the original position. Note: Ensure that the cable straps meet OEM specifications.
Turn the battery disconnect switch to the ON position.