![background image](http://html1.mh-extra.com/html/mack/granite-gu-series/granite-gu-series_operators-handbook-manual_686197164.webp)
OPERATION 153
Cruise Control with the MACK PowerLeash™
Engine Brake
When the MACK PowerLeash™ Engine Brake is enabled at the same time
your V-MAC® cruise control is in use, the engine brake automatically activates
when necessary to slow the vehicle to the cruise set point speed. You can
select one of two possible options:
• The engine brake is activated 2 mph above the cruise set point.
• The engine brake is activated as soon as cruise control commands fueling to
zero (vehicle has just reached cruise set point and fuel has been turned off).
The first option is the more popular choice for highway use and is the default
mode. Consult your V-MAC® IV Operator’s Manual for more information
about this option. Your local MACK dealer can change the current selection.
The engine brake’s ability to control maximum vehicle speed is limited
to the selected retarding power of the engine brake. If the engine brake
dash-mounted control switch is set to the LOW position, only half of the
available braking power is used. If the dash-mounted control switch is set to
the HIGH position, the cruise control invokes full engine brake power.
Note:
Deactivating the cruise control function does not disable the engine brake.
The MACK PowerLeash™ Engine Brake may be activated or deactivated by
other vehicle systems such as ABS and Headway control systems. Refer to
the literature concerning these systems for additional information.
Summary of Contents for Granite GU Series
Page 2: ......
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: ......