Kenworth T680 / Paccar MX-13, Cummins ISX etc. FAQs

Inaccurate or Erratic DEF Level Gauge Readings or DEF Consumption Issues on a Kenworth T680 Truck with a Cummins ISX Engine FAQs

Here are some common causes of inaccurate or erratic DEF level gauge readings on a Kenworth T680 truck with a Cummins ISX engine: Actually low DEF fluid level: This may seem obvious, but if you're running low on DEF, it can cause issues. This is the most common cause of inaccurate or erratic DEF level gauge readings. If the DEF fluid level is low, the gauge or dipstick may not accurately reflect the actual DEF level. Faulty DEF level sensor (aka DEF sending unit): If the DEF level sensor or wiring is not functioning properly, it may not accurately detect the DEF fluid level and the vehicle's computer system may not display the correct DEF level on the dashboard gauge or dipstick. This can cause the DEF level to fluctuate or appear to be erratic. The DEF level sensor is part of a multi-purpose component that also includes the DEF quality sensor, DEF tank temperature sensor, and DEF tank heater. Please note that if you are seeing DEF fault codes for any of these components, you may have a malfunctioning DEF sending unit (aka header), which is mounted on top of the DEF tank and looks like a cap with a clamp, but has tubes and wiring that goes down into the tank.

How to adjust the clutch on a Kenworth t680?

Remove the access cover for the clutch, if applicable Bar the engine over with a barring tool, or by the alternator (not recommended), until you find a bolt head placed in the middle of a tab (this is the adjustment bolt) Place the correct socket onto the bolt with a ratchet, afterward, press on the ratchet with a pry bar in order to press the bolt head in and begin turning clockwise Begin with 1 full turn and check your adjustment Repeat steps 3 and 4 as necessary