THE ROAD WITH THE MACK ENGINE BRAKE

you are not familiar with the use and operation a heavy - duty diesel engine brake, essential that you read the following section carefully . very important that you take the time gain experience with your MACK PowerLeash™ Engine Brake good driving conditions, before using dif ficult hazardous driving conditions, such steep descents slippery roads. course, there substitute for driver training a qualified specialist.

The following information intended a guideline safe and appropriate use the MACK PowerLeash™ Engine Brake. dif ficult describe every possible driving condition. Certain circumstances may require a more conservative approach than will described. When encountering any new driving route situation, err the side caution.

Over Flat T errain

The LOW power position likely adequate control vehicle speed situations where the roadway relatively flat has modestly graded rolling and total vehicle weight C0029331 grades and vehicle weight will necessary use the HIGH

Descending a Grade DANGER

The MACK PowerLeash™ Engine Brake assists you establishing faster downhill descent speeds than a similarly configured and loaded vehicle without engine brake; nevertheless, even with engine brake, there are limits the maximum vehicle speed which you can travel downhill grades and still keep your vehicle safely under control. Always approach these situations with caution, and gain the experience necessary for each grade and driving condition determine the appropriate downhill descent speed.

For a certain vehicle and load a may established for a given The control speed the vehicle speed which the retarding forces air rolling resistance and engine brake power are equally balanced the natural force gravity that causes the vehicle accelerate down the resulting a steady , controlled vehicle The additional vehicle slowing power fered the MACK PowerLeash™ Engine Brake allows the driver descend the hill a higher gear than normal (at a faster control without overspeeding the

For example, consider that you are descending a grade with a specific vehicle and assumed total vehicle weight. Y will find that without engine brake, you must descend this grade third gear maintain a steady mph 2,000 engine rpm, without the need apply the service brakes.

Descent Speed without MACK Engine Brake

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

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 example. 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. https://www.truck-manuals.net/mack/

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.

Only the vehicle demonstrates good control the LOW position only safe driving conditions) should you test the HIGH Return the LOW position and proceed with caution there any sign loss vehicle

Note: Always monitor vehicle tractability slippery road and make adjustments engine brake switch position and vehicle speed necessary . Always test the LOW power position setting before moving the HIGH

Y our MACK PowerLeash™ Engine Brake and ABS control systems are designed work together for optimized vehicle The engine brake function may modified interrupted briefly the event pending wheel

Caution

not enable the MACK PowerLeash™ Engine Brake during bobtail operations, when operating slippery r oads with empty lightly loaded trailer .