8.4.2 Drive belt – Tension check
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Test device
Y4345711 1
Preload gauge, 150–600 N
Y20097429 1
Measuring belt tension with frequency meter
1. Remove protective cover.
2. Tap against the belt with the handle of a hammer or with a wrench to initiate belt vibration.
3. Hold measuring tip of the frequency meter over belt drive.
4. The measured frequency value appears on the display of the frequency meter.
5. Compare measured value with value in the table.
6. If the measured values deviate from the specified values, adjust drive belt tension (→ Page 119).
7. Install protective cover.
Belt length ‒ Application Measured value
Initial installation (new belt)
Measured value
Operating tension (used belt)
Drive belt 1800 mm – Fan Frequency: 88 ±1 Hz Frequency: 77 ±1 Hz
Drive belt 1520 mm – Fan Frequency: 104 ±1 Hz Frequency: 92 ±1 Hz
Table 11: Specified values ‒ Measurement with frequency meter
Measuring depression depth with preload gauge
Note: The frequency measurement procedure is the preferred one because it provides more exact measurement
results.
1. Remove protective cover.
2. Set preload gauge onto the drive belt in the
middle between the belt pulleys (arrowed).
3. Using pushbutton, press vertically on top of
drive belt exerting even pressure until spring
can be heard or felt to engage.
4. Do not exert any more pressure as displayed
value will otherwise be falsified.
5. Remove preload gauge without changing the
position of the display arm.
6. Read off measured value at the intersection
of display arm and “KG” scale. Refer to table
below for set-point value.
7. If the measured values deviate from the
specified values, adjust drive belt tension
(→ Page 119).
8. Install protective cover.
MS15054/03E 2018-07 | Fan Drive | 117
TIM-ID: 0000053489 - 004
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