LINK AS-TRACK 5C0949 - 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 g03820428
Typical example
Illustration 2 g03820394
Illustration 3 g03731236
Typical example
Remove nitrogen oxide sensors (6) from exhaust elbow (7) and exhaust tube assembly (8). Ensure that the harness assembly 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 4.a through Step 4.c in order to remove nitrogen oxide sensor Electronic Control Module (ECM) (2).
Disconnect Original Equipment Manufacture (OEM) harness assembly (3) from the nitrogen oxide sensor ECM (2).
Cut cable straps (1) from the harness assembly. 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 bolts (4) nitrogen oxide sensor ECM (2). Remove the nitrogen oxide sensor ECM from bracket (5). 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 exhaust elbow and exhaust tube assembly. Replace the exhaust elbow and exhaust tube assembly if the mounting point is worn or damage.
Illustration 4 g03820428
Typical example
Illustration 5 g03820394
Illustration 6 g03731236
Typical example
If necessary, follow Step 3.a through Step 3.c in order to install nitrogen oxide sensor ECM (2).
Position nitrogen oxide sensor ECM (2) onto bracket (5). Ensure that the nitrogen oxide sensor ECM is correctly orientated onto the bracket.
Install bolts (4) to nitrogen oxide sensor ECM (2). 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 (3) to nitrogen oxide sensor ECM (2).
New nitrogen oxide sensor (6) are pre-lubricated. When installing an existing nitrogen oxide sensor (6), lightly lubricate the thread of the nitrogen oxide sensor with Tooling (A). Note: Ensure that the nitrogen oxide sensor is not contaminated.
Remove the probe of nitrogen oxide sensor (6) from the plastic bag. Install the nitrogen oxide sensor to exhaust elbow (7) and exhaust tube assembly (8). Ensure that the harness assembly is not damaged as the nitrogen oxide sensor is installed.
Use Tooling (B) to tighten nitrogen oxide sensor (6) to a torque of 50 N m (37 lb ft).
Install new cable straps (1) to the harness assembly. 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.