Tool Recommendation
Hendrickson recommends using a rotary union spanner wrench when installing its Tiremaax system (see figure 1). The tool serves two purposes. By fully inserting the prongs of the wrench into any two rotary union mounting holes, it holds the rotary union stationary while the threaded axle-hose connection is tightened. Since the rotary union is manufactured in two halves, the prongs keep both halves of the rotary union from rotating while the axle hose connection is being made, thereby ensuring that the mounting holes in both halves of the rotary union stay aligned.
Alcohol Evaporator or Injector Systems
Do not use an alcohol evaporator or injector in conjunction with an air dryer. The air dryer will remove most of the alcohol that is added at the compressor inlet and may reduce the air capacity of the dryer.
Installing an alcohol injector downstream of the dryer can cause excessive back pressure in the compressor discharge line. In some cases, this can lead to pressure relieve at the compressor safety valve. If air dryer capacity is not adequate, then the dryer is undersized for the application.
Fastener Change
As of June 2007, the fasteners used in all shift fork and yoke retention locations on Mack T200 and T300 transmissions were changed from a patch-lock type fastener to a new fastener which uses Scotch-Grip, a fastener adhesive, as the method of torque retention.
Torque specifications for these new fasteners remain the same. Do not reuse these fasteners. They are meant for one time use only.
Starting Aids
The use of ether or similar types of starting aids in Mack 2007 emission compliant engines is strictly prohibited. This applies to engines either with or without the cold weather electric pre-heater option.
For cold weather starting, the only acceptable starting aid is the electric pre-heater option, which is a factory-installed grid element located inside the intake manifold. This grid heats the intake air at cold start up.
Introducing ether or similar starting aids into the air intake system of an engine equipped with an electric pre-heater could cause a fire or explosion, resulting in severe personal injury or death.
Windshield Wiper Motor Linkage
As of August 17, 2007, Mack implemented a revised windshield wiper motor linkage block pinch bolt (Part No. 1AM4) and nut (Part No. 171AM1) into production on all CXU, CHU and GU models.
The pinch bolt is made of a material different from the previously used bolt to provide better torque retention and prevent loosening in service, and the nut is now a lock nut.
If the linkage block on the wiper motor shaft loosens, use the revised pinch bolt and nut to replace the existing hardware. The torque specification for the pinch bolt is 7 lb.-ft.
When reinstalling the linkage block on the wiper motor shaft, align the top edge of the block parallel with the wiper motor mounting plate (see figure 2).
Fastener Upgrade
Hendrickson has implemented a revision to all suspension models and aftermarket kits equipped with the Quick-Align pivot connection. A round-head shear-type bolt will replace the previous hex-head shear-type bolt to help make the connection tamper resistant (see figure 3).
Install the bolt from the inboard side of the frame bracket and tighten with an E20 Torx socket until the bolt’s Torx head shears off (see figure 4).
Neither the previous design nor the round-head shear-type bolt may be reused. Whenever the pivot connection is disassembled, the shear-type bolt must be removed by grinding or another appropriate method and discarded. The bolt and nut are not reuseable. A new shear-type bolt and hex nut must be installed and sheared to achieve the proper pivot connection torque and clamp force.
It is acceptable to mix the new round-head shear-type bolt with the previous hex-head shear-type bolt on the same suspension.
Safety Recalls
The National Highway Traffic Safety Administration (NHTSA) has issued the following recalls:
- Certain 2007 and 2008 model year Autocar WX, WXLL and WXR trucks fail to comply with requirements of Part 568, “Vehicles Manufactured in Two or More Stages, All Incomplete, Intermediate and Final-Stage Manufacturers of Vehicles Manufactured in Two or More Stages,” the gross vehicle weight rating label, as applied, may not be accurate. The label may indicate that the vehicle’s load capacity is higher than the designed weight rating. As a result, the vehicle could be overloaded without the vehicle operator’s knowledge. A vehicle in an overloaded condition may be susceptible to component failure that may result in loss of vehicle control, increasing the risk of a crash. Revised GVWR labels need to be applied.
- On certain 2008 model year Freightliner Century ST, Columbia and Coronado models the wiper motor ground wire was omitted in a new harness design. The wiper motor may not operate or may functional only intermittently. A ground wire needs to be added to the wiper motor harness.
- On certain 2006 to 2008 Freightliner Argosy, Business Class M2, Century ST, Classic, Classic XL, Columbia, Coronado, FLD and FLD 120; Sterling A-Line, Acterra and L-Line; and Western Star 4900 truck models equipped with Holland Simplex SE or SE II fifth wheels, the latch lever pivot bolts assembly may have been over-tightened. This could distort the pivot bolt spacer sleeve. Corrosion or contaminants in the pivot may cause it to bind and prevent the fifth wheel jaw from latching securely around the trailer king pin. The fifth wheel could fail to latch without the driver’s knowledge. When that occurs, the driver could drive away and the trailer could become disengaged increasing the risk of a crash. The pivot bolt and sleeve need to be replaced with a hex head shoulder bolt and washer.
- The side view mirrors may have been installed incorrectly on certain 2008 Hino NA6J, NB6J, NC6J, ND8J, NE8J, NJ8J and NV8J models. This could lead to the mirror glass detaching from the mirror housing. If this occurs the driver may not be able to see traffic approaching from the rear. Defective mirrors need to be replaced.
- On certain 2007 and 2008 International 7600 trucks equipped with split shaft style power take-off, the bolts that attach the driveshaft flanges to the split shaft PTO may loosen and allow the driveshaft to separate from the vehicle. Driveshaft separation may occur without warning and could get into the path of other vehicles, causing property damage, personal injury or death. The split shaft PTO flange mounting bolts need to be replaced and properly tightened.
