IM-738 Page 81
Sheave Alignment
Mounting:
1. Verify both driving and driven sheaves are in alignment
and the shafts are parallel. The center line of the driving
sheave must be in line with the center line of the driven
sheave. See Figure 86.
2. Verify that all setscrews are torqued to the values shown
in Table 25 on page 95 before starting drive. Check set-
screw torque and belt tension after 24 hours of service.
Figure 86. Sheave Alignment (adjustable shown)
Drive Belt Adjustment
General Rules of Tensioning
1. The ideal tension is the lowest tension at which the belt
will not slip under peak load conditions.
2. Check tension frequently during the first 24-48 hours of
operation.
3. Over tensioning shortens belt and bearing life.
4. Keep belts free from foreign material which may cause
slippage.
5. Make V-drive inspection on a periodic basis. Adjust ten-
sion if the belt is slipping. Do not apply belt dressing. This
may damage the belt and cause early failure.
Tension Measurement Procedure
1. Measure the belt span. See Figure 87.
2. Place belt tension checker squarely on one belt at the cen-
ter of the belt span. Apply force to the checker, perpendic-
ular to the belt span, until the belt deflection equals belt
span distance divided by 64. Determine force applied
while in this position.
3. Compare this force to the values in Table 21 on page 82.
Figure 87. Drive Belt Adjustment
C e n t e r l i n e s
m u s t c o i n c i d
M u s t b e
p a r a l l e l
M u s t b e
p a r a l l e l
A d j u s t a b l e
S h e a v e
M o t o r
B e a r i n g
B e l t S p a n
D e f l e c t i o n =
B e l t S p a n
6 4
To Next Page
Loading...
Need help?
General
