23
SHEAVE
STRAIGHT EDGE
SHEAVE
THREADED ROD
FAN SHAFT
Sheave Alignment
• The motor sheave is to be positioned as close as possible to the motor in
order to minimize torque on the motor bushings.
• The motor and fan sheaves may have grooves that are not used. The bottom
surface of the motor and fan sheaves must be aligned within
1
⁄
8
" of each
other and level within
1
⁄
2
° (
1
⁄
8
" in 12) in order to not adversely affect belt and
sheave life.
• Alignment can be achieved by placing a straight edge across the sheaves
making sure that it is level and measuring down to the bottom surface of
both sheaves at four points.
• The belt is to be located in the lowest set of
grooves.
maintenance
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B
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t
s
a
F
e
u
q
r
o
T
b
l·
tf
ƒ
m
·
N
H
S
₄
⁄
¹
0
2
-
6
8
S
D
S
₄
⁄
¹
0
2
-
6
8
D
S
₄
⁄
¹
0
2
-
6
8
K
S
₆
₁
⁄
⁵
8
1
-
3
1
8
1
F
S
₈
⁄
³
6
1
-
2
2
0
3
E
₂
⁄
¹
3
1
-
5
3
8
4
F
₆
₁
⁄
⁹
2
1
-
5
6
8
8
Bushing Fastener
Torque Values