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when a'djusting, there will be heavy stresses on the
drive end bearing shiel,d.
On f itting a
new
beH,
f
in
a
l
tensioning
shou ld be
car'ried
out
after
driving for about
10minuI
t es.
This
will ensure
a longer lifertime for the pul,ley
belt.
FAN COUPLlNG
The fan coup ling f
uncti
on ca
n
be checked wit
h
a
stroboscope
w it
h
variab le b
li nkin
g freq uency. Make
a ma
rk
o
n
the fan a nd onethe
w
a ter pump pu
ll'
e y.
Find out the speed re,lat
ion'
s hip between fan and p
ull
ey
by means of
rt
he stroboscape. The fan speed shou ld
follow the speed of
the
water pump accord ing to the
curve given in Fig. 2-96.
2:
44
4000
3000
2000
V
1000
1000
/
V
/
V
2000
----
l.--'
/V
~"'"
I
~
3000
4000
5000
Fig
.
2-95.
Curve for
fan coupling
slip
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