Man D 2848 LE 401, Operating Instructions Manual

Page: 52 / 64

Maintenance and care
54
V-belts
Checking condition
If, in the case of a multiple belt drive, wear
or differing tensions are found, always re-
place the complete set of belts.
D
Check V-belts for cracks, oil, overheat-
ing and wear
D
Change demaged V-belts
Checking tension
Use V-belt tension tester to check V-belt
tension.
D
Lower indicator arm
À
into the scale
D
Apply tester to belt at a point midway
between two pulleys so that edge of
contact surface
Á
is flush with the
V-belt
D
Slowly depress pad
Â
until the spring
can be heard to disengage. This will
cause the indicator to move upwards
If pressure is maintained after the spring
has disengaged a false reading will be ob-
tained!
Reading of tension
D
Read of the tensioning force of the belt
at the point where the top surface of
the indicator arm
À
intersects with the
scale
D
Before taking readings make ensure
that the indicator arm remains in its
position
If the value measured deviates from the
setting value specified, the V-belt tension
must be corrected.
1
2
3
Drive
belt
width
Tensioning forces according to
the kg graduation on the tes-
ter
New installation
When
servicing
after
long run-
ning time
Installa-
tion
After 10
min. run-
ning time
9.5 45 − 50 40 − 45 30
10.0 45 − 50 35 − 40 30
12.5 50 − 55 45 − 50 35
13.0 50 − 55 40 − 45 35
20.0 75 70 60
22.0 75 70 60
2/3VX 90 − 100 70 − 80 60
3/3VX 135 − 150 105 − 120 90