7.14.2 Drive belt – Tension check
Preconditions
☑
Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use
Part No.
Qty.
Tester
Y4345711
1
Belt tension tester, 150-600 N
Y20097429
1
Fan drive – Checking belt ten-
sion
1.
Remove protective cover.
2.
Set belt tension tester onto the drive belt
in the middle between the belt pulleys (ar-
rowed).
3.
Using pushbutton, press vertically on top
side of drive belt exerting even pressure
until spring engages noticeably.
4.
Do not exert any more pressure as dis-
played value will otherwise be falsified.
5.
Remove tension tester without changing
the position of the display arm.
6.
Read off measured value at the intersec-
tion of display arm and “KG” scale. Refer to
table below for specifications.
Application
Specification
Initial installation (new belt)
Specification
Operating tension (used belt)
Fan drive belt
Frequency: 113 ±1 Hz
Frequency: 103 ±1 Hz
Table 4: Measuring belt tension with frequency meter
Application
Specification
Initial installation (new belt,
runtime 0.5-2 h)
Specification
(used belt, runtime 500 h)
Fan drive belt
Depression depth: 6 mm
Test force: 188 N
Depression depth: 5 mm
Test force: 188 N
Table 5: Measuring depression depth with tension tester
Application
Specification
Initial installation (new belt,
runtime 0.5-2 h)
Specification
(used belt, runtime 500 h)
Fan drive belt
Strand pull: 4500 N
Strand pull: 3750 N
Table 6: Measuring static strand pull
7.
If the measured values deviate from the specifications above, adjust drive belt tension (→ Page 97).
8.
Install protective cover.
96 | Task Description | MS150111/01E 2014-05
TIM-ID: 0000043677 - 002