50
Occasionally, the road conditions, load, or traffic conditions will make it desirable to restrict the automatic
shifting to a lower gear. Positions 2, 3, 4, 5, provide progressively greater engine braking for going down
grades (the lower the gear, the greater the braking effect). The push-button selector utilizes arrow buttons.
Push the Up or Down arrow to the desired gear. The SELECT indicator will display your choice and the
MONITOR
will display the selected gear when it is attained.
1st Gear
Use position (1) gear when pulling through mud and deep snow, when maneuvering in tight spaces, or
while driving up or down grades. Low gear provides the vehicle with its maximum driving power and
maximum engine braking power.
The transmission incorporates a hold feature to prohibit upshifting above the gear selected during nor-
mal driving. For downhill operation, however, the transmission may upshift above the highest selected gear
when the engine governed speed is exceeded and damaging engine overspeed is a possibility.
CHECK TRANSMISSION LIGHT
The “CHECK TRANSMISSION LIGHT” is located on the shifter cover. The electronic control system is
programmed to inform you if operating parameters have been exceeded and automatically take action to
protect the operator, vehicle, and transmission. A diagnostic code will be registered when the CHECK TRANS-
MISSION
light is on and also when other conditions are diagnosed which do not require the CHECK TRANS-
MISSION
light to be on.
Every time the engine is started, the CHECK TRANSMISSION light comes on then goes off after a few
seconds. This momentary lighting is to show that the lighting circuit is working properly. If the light does
not come on during engine start, service should be requested immediately.
Illumination of this light, accompanied by 8 seconds of short beeps from the shift selector, indicates that
shifts are being restricted. The SELECT digit on the display will be blank. Operation may continue in order
to reach service assistance. The ECU may not respond to shift selector requests since operating limitations are
being placed on the transmission; i.e., upshifts and downshifts may be restricted. Direction changes will not
occur.
For push-button shift selectors, the ECU will not respond to operator requests. The ECU will cause the
transmission to shift to a safer gear and a Hold-In-Range. See Allison Operator's Manual for Hold-In-Range
and reset procedure.
DOWNSHIFT OR REVERSE INHIBITOR FEATURE With/MD3060
Although there is no limitation on upshifting, there is on downshifting and shifts from Neutral into Drive
or Reverse. If a downshift or Neutral-to-Range shift is selected when the engine speed or throttle position is
to high, the ECU will prevent the shift from occurring until a lower speed is reached. If idle speed is to high,
shifts to range are inhibited. A continuous “beep” tone is emitted if reverse is selected during forward move-
ment or a neutral-to-range shift is selected at too high an engine speed.
COLD WEATHER STARTS MD 3060
Most World transmissions are programmed to restrict full operation until specific temperatures are reached.
Refer to the following chart for temperature restrictions.
Sump Oil
Temperature
CHECK
TRANS. light
Operation
-32 deg.C (-25 deg.F)
and below
-31 deg.C (-24 deg.F)
to -7 deg.C (+20 deg.F)
-7 deg.C (20 deg.F)
and above
ON
OFF
OFF
Neutral only
Neutral, First,
Second, or Reverse
Full operation
in all gears
