Fluid Level Check Using The Pushbutton Shift Selector; Recommended Automatic Transmission Fluid - PREVOST H3-41 Maintenance Manual

The Cold Check is more appropriate for
verifying the oil level after the first fill-up. In case
of conflict, the Hot Check has priority over the
Cold Check; the fluid level check using the
pushbutton shift selector has priority over
the Hot Check.
3.2 FLUID LEVEL CHECK USING THE
PUSHBUTTON SHIFT SELECTOR
The oil level sensor (OLS) is standard in your
transmission. With the OLS and Allison 5
generation shift selector, you can get a more
accurate electronic fluid level check than with a
dipstick.
Oil level codes are obtained as follows:
1. Park vehicle on a level surface, select «N»
(neutral) on the pushbutton shift selector and
apply parking brake.
2. Wait for at least 2 minutes to allow the oil to
settle;
3. Press simultaneously the
(Downshift) arrow buttons once.
4. Oil level codes are displayed once the
following parameters are met :
 The vehicle has been stationary for
approximately 2 minutes to allow the
oil to settle;
 Engine at idle;
 Oil at normal operating temperature,
between 104°F (40°C) and 220°F
(104°C);
 Transmission in «N» (Neutral);
 Transmission output shaft stopped;
 Oil level sensor present and working.
5. Correct fluid level
displayed as shown.
6. Low fluid level
displayed as shown. The
number indicates
number of quarts of fluid
the transmission
requires.
th
(Upshift) and
is
is
the
PA1621 Maintenance Manual All Series | January 2017
SECTION 07: TRANSMISSION
7. High fluid level condition
with the number of quarts
in excess is displayed as
shown.
NOTE
Confirm a low fluid level condition by making a
manual fluid level check.
8. To exit the Oil Level Display Mode, press
any range button «R», «N» or «D» at any
time.
NOTE
Note that the quantities LO 4 and HI 3 are the
largest values displayed and that the actual
variation in oil level may exceed these
numbers.
If the fluid level check cannot be completed, an
invalid for Display fault is reported. Refer to table
below to review the codes and conditions.
CODE CAUSE OF FAULT
CODE
SETTLING OK Settling time too short
ENG RPM TOO Engine speed (rpm) too
LOW low
ENG RPM TOO Engine speed (rpm) too
HIGH high
MUST BE IN N (Neutral) must be
NEU selected
OIL TEMP TOO Sump fluid temperature
LOW too low
OIL TEMP TOO Sump fluid temperature
HIGH too high
VEH SPD TOO
Output shaft speed
HI
SENSOR FAILED Sensor failure
3.3 RECOMMENDED AUTOMATIC
TRANSMISSION FLUID
Only use fluids meeting Allison Transmission
specification TES295
transmission. Refer to TES295 or TES389
Approved Fluids list,
Service/Parts heading on the home page of the
Allison Transmission
www.allisontransmission.com.
or TES389 in your
found under the
web site
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