152 OPERA TION

Switch the MACK PowerLeash™ Engine Brake the HIGH and now possible descend the same grade sixth gear maintain a steady mph engine

Caution

The maximum allowable engine speed listed the warning label the sun visor . NOT exceed 2,300 rpm. C0029334

Descent Speed without MACK Engine Brake any gear selection higher than sixth gear (in this would necessary occasionally apply the service brakes maintain a safe vehicle speed and avoid overspeeding the

Danger

with any vehicle, regular and excessive application the service brakes during a downhill descent can lead a brake lining overheat condition, resulting a very dangerous loss service brake retarding capability .

Note: The previous figures apply only this hypothetical Specific vehicle control speeds and engine speeds for a given descent are dependent upon the actual vehicle and engine configurations, the gross weight the vehicle, and the percent grade the

Slippery Road Surfaces

with many aspects operating a heavy - duty vehicle, special care should taken when using the MACK PowerLeash™ Engine Brake slippery road surfaces. The potential for unpredictable loss vehicle traction a serious concern; some situations the engine brake should not used all.

approach untested driving conditions with A void use the MACK PowerLeash™ Engine Brake these situations until you have gained some experience under normal driving a rule, make sure that the vehicle demonstrating good tractability with the engine brake f before checking for tractability with the engine brake enabled.

Then, provided traf fic conditions are safe for tractability , switch the MACK PowerLeash™ Engine Brake the LOW position. the vehicle shows any signs loss control (ABS activation vehicle swerving, for example), immediately switch the engine brake back the OFF position.

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