7.13.2 Drive belt – Tension check
Preconditions
☑Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Tester
Y4345711 1
Preload measuring device, 150-600 N
Y20097429 1
Belt tension check – Fan drive
Measuring depression depth with preload measuring device
Note: The frequency measurement procedure is the preferred one because it provides more exact measure-
ment results.
1. Remove protective cover.
2. Set preload measuring device onto the drive belt in the middle between the belt pulleys (arrow).
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 measuring device 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 118).
8. Install protective cover.
Belt length ‒ Application Measured value
Initial installation (new belt,
runtime 0.5-2 h)
Measured value
(used belt, runtime 500 h)
Drive belt 1800 mm – Fan Depression depth: 7 mm
Test force: 188 N
Depression depth: 8 mm
Test force: 188 N
Drive belt 1520 mm – Fan Depression depth: 6 mm
Test force: 188 N
Depression depth: 7 mm
Test force: 188 N
Table 113: Set-point values ‒ Measurement with preload measuring device
116 | Task Description | MS150118/00E 2014-07
TIM-ID: 0000053489 - 001
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