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OPERATION 157
In any gear selection higher than sixth gear (in this example), it would be
necessary to occasionally apply the service brakes to maintain a safe vehicle
speed and to avoid overspeeding the engine.
DANGER
As with any vehicle, regular and excessive application of the service brakes
during a downhill descent can lead to a brake lining overheat condition, resulting
in a very dangerous loss of service brake retarding capability.
Note:
The previous figures apply only to 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 of the vehicle, and the percent
grade of the road.
On Slippery Road Surfaces
As with many aspects of operating a heavy-duty vehicle, special care should
be taken when using the MACK PowerLeash™ Engine Brake on slippery road
surfaces. The potential for unpredictable loss of vehicle traction is a serious
concern; in some situations the engine should not be used at all.
As always, approach untested driving conditions with caution. Avoid use of the
MACK PowerLeash™ Engine Brake in these situations until you have gained
some experience under normal driving conditions.
As a rule, make sure that the vehicle is demonstrating good tractability with the
engine brake off before checking for tractability with the engine brake enabled.
Then, provided traffic conditions are safe for "testing" tractability, switch the
MACK PowerLeash™ Engine Brake to the LOW position. If the vehicle shows
any signs of loss of control (ABS activation or vehicle swerving, for example),
immediately switch the engine brake back to the OFF position.
Summary of Contents for Granite GU Series
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Page 11: ......
Page 44: ...SAFETY INFORMATION 33 Advisory Label Locations On Vehicle Labels Found on Chassis C0029831 ...
Page 45: ...34 SAFETY INFORMATION C0028958 ...
Page 46: ...SAFETY INFORMATION 35 C0028959 ...
Page 47: ...36 SAFETY INFORMATION C0029013 1 Right Side Frame Rail 2 Hood Prop ...
Page 48: ...SAFETY INFORMATION 37 C0029014 ...
Page 49: ...38 SAFETY INFORMATION Labels Found on Driver Side Sun Visor C0029832 ...
Page 50: ...SAFETY INFORMATION 39 C0029016 ...
Page 58: ...SAFETY INFORMATION 47 C0029833 ...
Page 60: ...SAFETY INFORMATION 49 C0029834 ...
Page 62: ...SAFETY INFORMATION 51 C0029835 ...
Page 72: ...INSTRUMENTS AND CONTROLS 61 Panel B W3056238 ...
Page 81: ...70 INSTRUMENTS AND CONTROLS C0029141 ...
Page 82: ...INSTRUMENTS AND CONTROLS 71 Diagnostics W3036575 W3036576 W3036583 ...
Page 84: ...INSTRUMENTS AND CONTROLS 73 C0029144 ...
Page 113: ...102 INSTRUMENTS AND CONTROLS C0029240 C0029241 ...
Page 235: ...224 OPERATION C0029351 ...
Page 241: ...230 OPERATION C0029352 ...
Page 284: ...MAINTENANCE AND LUBRICATION 273 C0029851 C0029852 1 Towhook Access ...
Page 305: ...294 MAINTENANCE AND LUBRICATION C0029434 1 Front 2 Back ...
Page 317: ......