OPERATIONS INSIDE THE ENGINE COMPARTMENT
PERIODIC INSPECTION AND MAINTENANCE
2-10
OPERATIONS INSIDE THE ENGINE COMPARTMENT
A1. CHECK DRIVE BELT FOR CRACKS,
FRAYING, WEAR, AND ADJUST ITS
TENSION
M6020202900778
DRIVE BELT CONDITION
Check the whole rounds of the drive belt for cracks,
fraying and wear.
DRIVE BELT TENSION CHECK AND
ADJUSTMENT <4M41>
Check the drive belt tension in the following proce-
dure.
Standard value:
<WHEN THE VIBRATION FREQUENCY IS
MEASURED {SPECIAL TOOL (MB992080)
IS USED}: RECOMMENDATION>
NOTE: The vibration frequency measuring method is
recommended for check and adjustment of the drive
belt tension.
1. Connect the Special tool microphone assembly
(MB992082) to the Special tool belt tension meter
(MB992081) of the Special tool belt tension meter
set (MB992080).
2. Press the "POWER" button to turn on the power
supply.
3. Press number key 1. Check to ensure that "No.
01" appears on the upper left of the display and
that the following numeric values are displayed for
individual items (M, W, and S):
M 000.9 g/m
W 010.0 mm/R
S 0100 mm
If numeric values have not been entered (new
tool), set them according to the belt specifications
as shown below. Once you set them, you do not
have to set them again. The settings remain
undeleted even after battery replacement.
NOTE: This operation is to temporarily set the
preset data such as the belt specifications,
because if the measurement is taken without input
of the belt specifications, conversion to tension
value (N) cannot be made, resulting in judgement
of error.
<Setting procedure>
(1) Press down the "MASS" button till the belt
mass select display appears.
(2) Press the "UP" or "DOWN" button to select "01
1.5GT 0.9" and press the "MEASURE" button
to decide it.
Check to ensure that "M 000.9 g/m" is
displayed.
(3) Press the "WIDTH" button to change to the
belt width input display.
(4) Press number keys 0, 1, 0, and 0 sequentially,
and press the "SELECT" button to apply them.
Check to ensure that "W 010.0 mm/R"
appears on the display.
(5) Press the "SPAN" button to change to the
span length input display.
(6) Press number keys 0, 1, 0, and 0 sequentially,
and press the "SELECT" button to apply them.
Check to ensure that "S 0100 mm" appears on
the display.
4. Press "Hz" button twice to change the display to
the frequency display (Hz).
Item When
checked
When
adjusted
When
replaced
Vibration
frequency
Hz
149 − 199 163 − 188 188 − 230
Tension N 245 − 441 294 − 392 392 − 588
Deflection
mm
(Reference)
9.1 − 12.7 9.8 − 11.7 7.2 − 9.8
AC507219
AB
MB992082
MB992081
Belt tension meter set (MB992080)
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