Tech Updates

Door Weatherseal Replacement

Figure 1 Untitled 1Mack Trucks offers the following advice on how to replace the door weatherseals on CHU, CXU, GU and TD models.

* Remove the threshold plate.

* Remove the door weatherseal from the cab. (See Figure 1.)

* Clean the glue off the cab using a 50 percent solution of isopropyl alcohol and water. Note: The vehicle must be at a minimum of 68°F. (See Figure 2.)

Figure 2 Untitled 1* Warm the seal to 86°F to 104°F with a heat gun. Also warm the cab panel where the seal is to be placed.

* Install the replacement door weatherseal. Note: Make sure the weatherseal is seated on the lip before you pull the adhesive strip off. (See Figure 3.)

* Using an appropriate sized roller, roll the weatherseal, applying firm, even pressure all the way around the seal. (See Figure 4.)

Figure 3 Untitled 1* Install the threshold plate.

Figure 4 Untitled 1









The National Highway Traffic Safety Administration (NHTSA) has issued the following recalls:

* Certain Strick model year 2006-2009 dry freight vans equipped with ArvinMeritor axles may have a defect involving spindle nuts and stake washers. This has been identified as low torque on the spindle nut on ArvinMeritor TL series trailer axles installed in van trailers where the stake washer for the nut is staked in a single location as opposed to multiple locations. Low or no torque on the nut can result in excessive end play in the wheel-end system and could progress to a wheel separation.

* Degradation of a combustion tube weld on certain Caterpillar C15 diesel engines manufactured from Apr. 24, 2006 through Mar. 27, 2009, can result in radial heat impingement on the body. This could cause the body to burn.

* As a result of incomplete “knitting” of the iron at the time of casting on some Gunite automatic slack adjusters manufactured from Oct. 15, 2010 through Jan. 31, 2011, there could be inadequate structural integrity of the slack adjusters. This can cause the housing to break at the handle under normal operating loads. If the slack adjuster housing breaks, the wheel brake to which the slack adjuster is attached would no longer function, reducing the braking capacity. Additionally, if it is mounted on the steer axle the vehicle could pull to one side, possibly resulting in a crash.

* Certain model year 2011 Daimler Trucks including Freightliner Coronado, Columbia, Business Class M2, Cascadia and Century, and Western Star 4900 trucks manufactured from Aug. 9, 2010 through Oct. 27, 2010, fail to comply with the requirements of Federal Motor Vehicle Safety Standard No. 120, “Tire Selection and Rims for Motor Vehicles other than Passenger Cars.” These vehicles were not equipped with labels listing recommended cold tire inflation pressures. Failure to follow proper tire inflation recommendations can result in tire failure.

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