MVP Variable Speed Sheaves
Mounting:
1 . Verify both driving and driven sheaves are in alignment
and the shafts are parallel . The centerline of the driving
sheave must be in line with the centerline of the driven
sheave (
Figure 55
) .
2 .
Verify that all setscrews are torqued to the values shown
in
Table 27
before starting drive. Check setscrew torque
and belt tension after 24 hours of service .
Adjusting:
1 .
Adjust motor base forward to release belt tension.
Remove the belts for easier adjustment .
2 .
Loosen, but do not remove both of the locking setscrews
A
in the outer locking ring by using a hex key or torque
wrench with a hex bit.
3 . Adjust sheave to desired pitch diameter by turning
the outer locking ring, using a spanner wrench or drift
inserted into the three holes that are located 120° apart
on the ring .
4 .
Any pitch diameter can be obtained within the sheave
range . One complete turn of the outer locking ring
changes the pitch diameter 0 .233" .
5 .
Do not open sheaves more than the following
a . Do not open
B
sheaves more than 4-3/4 turns for
the
A
belts or 6 turns for the
B
belts .
b . Do not open
C
sheaves more than 9-1/2 turns .
c . Do not open
5V
sheaves more than 6 turns .
d . Do not open
8V
sheaves more than 8 turns .
6 .
Tighten BOTH locking screws
A
in the outer locking ring
before operating the drive. Use a torque wrench and
tighten to the value shown in
Table 27
.
7 . Replace belts and adjust the motor base to tension the
belts properly . See
Fan Drive Belt on page 42
.
8 .
Do not loosen any screws other than the two locking
screws
A
in the outer locking ring when adjusting the
sheave pitch . Do not operate the drive until the locking
screws have been set to the torque specifications.
Figure 54: LVP Type Sheave Adjustment
Section A-A
Section A-A
A
B
C
D
E
F
D
E
A
E
C
F
D
A
A
IM 672-11 • VISION AIR HANDLING UNIT 40
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aInTenanCe
