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.
