We have a 740B running on site that will not put power to the rear axels unless the truck is in reverse. We have no fault codes and the sensor to detect wheel spin on the front axel is functioning. This has my maintenance department stumped. Other than this issue the truck is in fantastic shape and runs well. Anyone seen this before? Thoughts on what to trouble shoot first?
serial number please I am assuming you have auto traction control (ATC) have you tried engaging manual mode through the settings menu to see if it engages the interaxle locks. (this is used for low speed only) mark