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When installing large or heavy parts in a conventional mount, it may be easier to mount the key
and bushing on the shaft first, then place the sprocket/sheave on the bushing and align the holes.
Note: When mounting sprockets/sheaves on a vertical shaft, pre-cautions must be taken to
prevent the sprocket/sheave and/or bushing from falling during installation.
4. Alternately tighten the cap screws until the sprocket/sheave and bushing tapers are completely
seated together (use approx. half of the recommended bolt torque; see Table 2).
5. Check the alignment and axial sprocket/sheave run out (wobble), and correct as necessary.
6. Continue alternate tightening of the cap screws to the recommended torque values specified in
Table 2 below. Do not tighten cap screws further once the recommended torque is reached.
Note:
Excessive bolt torque can cause sprocket/sheave and/or bushing breakage.
properly mounted, a gap between the bushing flange and sprocket/sheave should exist.
Bushing
Style
JA
SH & SDS
SD
SK
SF
M
W
Caution: Excessive bolt torque can cause sprocket/sheave and/or bushing breakage.
Note: To insure proper drive performance, full bushing contact on the shaft is recommended.
7. Tighten the set screw, when available, to hold the key securely during operation.
To Remove QD Type Bushings
1. Loosen and remove all mounting bolts.
2. Insert cap screws into all threaded jack screw holes.
3. Loosen the bushing by first tightening the screw furthest from the bushing saw slot, then,
alternately tighten remaining screws. Keep tightening the screws in small but equal
increments until the tapered sprocket/sheave and bushing disengage.
Note: Excessive or unequal pressure on the bolts can break the bushing flange, making
removal impossible without destroying the sprocket/sheave.
®
QD
Bolts (in)
Qty.
H
2
1/4 x 3/4
3
10-24 x 1
3
1/4-20 x 1 3/8
3
1/4-20 x 1 7/8
3
5/16-18 x 2
3
3/8-16 x 2
E
3
1/2-13 x 2 3/4
F
3
9/16-12 x 3 5/8
J
3
5/8-11 x 4 1/2
4
3/4-10 x 6 3/4
N
4
7/8-9 x 8
P
4
1-8 x 9 1/2
4
1 1/8-7 x 11 1/2
S
5
1 1/4-7 x 15 1/2
Table 2 – QD Bushing Bolt Torque Values
4
Bushings
Torque Wrench
Size
lb-ft
7.9
4.5
9.0
9.0
15.0
30.0
60.0
75.0
135.0
225.0
300.0
450.0
600.0
750.0
When
lb-in
95
54
108
108
180
360
720
900
1620
2700
3600
5400
7200
9000
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