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4
TAPERED SIDE
OF KEY
GEAREDUCER
FAN SHAFT
1
1
/
2
"
1
3
/
8
"
1
1
/2
"
5
/
8
"
MIN
KEY
FAN HUB
LOCKING
STRAPS
RETENTION
PLATE
RETENTION
BOLTS
Fan Hub Installation
Figure 3
36 and 38 Geareducer
Figure 2
36 and 38 Geareducer
3–Raise the hub assembly above the fan shaft for installation. Slowly
lower the assembly onto the shaft with the keyways aligned. Make
certain the key does not slide down during installation. Stake the
key in the keyway with a center punch if necessary.
After the hub assembly is installed the bottom end of the key must
extend through the bottom of the center hub, and the top end of
the key must extend 5/8″ (16mm) minimum above the top of the fan
shaft. Do not force the key down once these criteria are met.
4–Figure 3 illustrates proper retention plate and hardware installa-
tion. The retention plate is designed to allow clearance for the fan
shaft key, and when properly installed will not extend over or inter-
fere with the key in any way. Torque the retention bolts to 70 ft·lb
ƒ
(95 N·m) then turn up the locking strap corners to prevent the bolts
from loosening.