A L L I S O N T R A N S M I S S I O N O P E R A T I O N
2-2
Driving Conditions
•
Normal driving – best fuel economy
o
Select “
D
” and “
Mode On
”
•
Performance
o
“
Mode Off
”
o
For mountain driving, select lower gears to maintain
2000+ engine RPM
•
Hill climbing on hot days
o
Keep
RPM
s high to cool engine
Driving Tips with the Allison 3000MH or 4000MH Transmission:
The points at which shifts occur depend upon predetermined speeds and other operating conditions. A
transmission “shift calibration” includes several sets of shift points used according to current or anticipated
operating conditions, such as engine or transmission fluid temperature. You can change shift schedules using
the
MODE
button.
The transmission control module (
TCM
) includes the capacity for two separate and distinct shift calibrations,
one for use in “
Primary Mode
” of operation and one in “
Secondary Mode
.”
Primary
– This shift schedule is typically used for all normal vehicle operations.
Secondary
– This is an alternate shift schedule that the
TCM
uses upon request. This is operator-
controlled using the
MODE
button.
When you are driving under normal road conditions, the
DRIVE
mode is recommended for the best
performance and fuel economy. The
MODE
switch should be set to
ON
for economy mode, but
MODE off
should be used when climbing hills and when extra performance is required.
The display screen on the shift control pad will indicate the highest selected gear for the transmission. When
mountainous or up-and-down terrain conditions are encountered, you should
manually select a lower gear
,
preferably lower than 5
th
gear. This can be done at any road speed by pressing the down arrow repeatedly until
the desired gear is indicated in the window of the shifter pad. When your road speed decreases to a safe point,
the transmission will downshift at a higher
RPM
than normal. This will decrease the use of overdrive while
pulling hills, which can result in excessive heat build-up in the transmission, and keeps the engine operating at
peak horse power and performance.
When ascending a grade, maintain engine speed to within
400-500 RPM
of governed engine speed. Governed
speed will be
2200 RPM
on the Cummins ISL
engine model. Road speed may decrease, but the engine will be
at its peak in the power curve.
It is especially pertinent to monitor your water temperature gauge when climbing steep grades. Keep in mind
that it is not uncommon for the temperature to increase, especially in hot weather. If the gauge reaches the end
Summary of Contents for PowerGlide 2019
Page 6: ...T I R E C A R E 1 1 TIRE CARE Chapter 1 ...
Page 14: ...B R A K E S Y S T E M 3 1 Brake System Chapter 3 ...
Page 17: ...B R A K E S Y S T E M 3 4 Compressed Air System 36 and 40 Bus Non Tag Tank Drains ...
Page 18: ...B R A K E S Y S T E M 3 5 43 Bus Tag Tank Drains ...
Page 21: ...B R A K E S Y S T E M 3 8 ...
Page 37: ...C U M M I N S E N G I N E S 4 17 ...
Page 38: ...S C H E D U L E D M A I N T E N A N C E 5 1 Scheduled Maintenance Chapter 5 ...
Page 45: ...S C H E D U L E D M A I N T E N A N C E 5 8 Lubrication Points ...
Page 46: ...S C H E D U L E D M A I N T E N A N C E 5 9 Lubrication Points ...
Page 47: ...S C H E D U L E D M A I N T E N A N C E 5 10 Lubrication Points ...
Page 48: ...S C H E D U L E D M A I N T E N A N C E 5 11 Lubrication Points ...
Page 53: ...S C H E D U L E D M A I N T E N A N C E 5 16 ...
Page 54: ...P R E T R I P I N S P E C T I O N 6 1 Pre Trip Inspection Chapter 6 ...
Page 57: ...I N S T R U M E N T S C O N T R O L S 7 1 Instruments Controls Chapter 7 ...
Page 84: ...I N S T R U M E N T S C O N T R O L S 7 28 MENU MAP SETTINGS MENUS Settings Menus ...
Page 92: ...I N S T R U M E N T S C O N T R O L S 7 36 ...
Page 93: ...A I R S U P P L Y 8 1 Air Supply Chapter 8 ...
Page 95: ...A I R S U P P L Y 8 3 ...
Page 96: ...T A G A X L E 9 1 Tag Axle Chapter 9 ...
Page 98: ...W A R R A N T Y 10 1 Warranty Chapter 10 ...
Page 100: ...W A R R A N T Y 10 3 ...