By Truck Parts & Service Staff
Pressure Sensor Hose & Clamp
Effective April 22, 2008, the coupling hoses and hose clamps used to connect the pressure tubes to the differential pressure sensor on Mack MRU and LEU model chassis equipped with the non-catalyzed diesel particulate filter, were changed to smaller clamps (labeled 1 in Figure 1) and a smaller inside diameter hose (labeled 2 in Figure 1). This was done to eliminate leakage.
Prior to this implementation date, leakage could occur if the clamps were not tightened adequately, but the clamps could be damaged when tightened sufficiently in an attempt to stop the leakage.
If you find leakage at the differential pressure sensor tubes on a chassis manufactured prior to April 22, 2008, replace the existing coupling hose and clamps with the new components: Part No. 83AX968 (hose clamp, maximum diameter 0.63 inch, minimum diameter .38 inch) replaces Part No. 83AX782; Part No. 160AX567F (hose, 3 inches long) replaces Part No. 243AX16.
Low-lube Transmission Failures
There have been several instances of transmission failures caused by lack of lubricant, according to Roadranger.
