Amity Technology 2720, Operating Manual

Page: 93 / 95

14 - 4
5. Align the sprocket and tighten the screws alternately and progressively until they are pulled up
tight. (See Table 14
- 2.) Do not use extensions on wrench handles, and do not allow the sprocket
to be drawn in contact with the flange of the bushing. There should be a gap between bushing
flange and sprocket.
CAUTION: This gap must not be closed.
Table 14 - 2: Wrench Torque Values for Tightening Bushings
MST bushing size Size of cap
screw
Wrench torque in - lbs
(N·m)
H ¼ X ¾ 95 (129)
P
⁵ ⁄ ₁₆
X 1
192 (260)
Q
⅜
X 1
¼
348 (472)
R
⅜
X 1 ¾
348 (472)
S
1/2 X 2
¼
840 (1139)
U
⅝
X 2 ¾
1680 (2278)
W ¾ X 3 3000 (4068)
WARNING: Use of anti - seize lubricant on tapered cone surfaces or on bolt threads when mounting may
result in damage to the sheaves and sprockets. This voids all manufacturers ’ warranties.
WARNING: Because of the possible danger to person(s) or property from accidents that may result
from the improper use of products, it is important that correct procedures be followed. Products must
be used in accordance with the engineering information specified in the catalog. Proper installation,
maintenance, and operation procedures must be observed. The instructions given above must be fol-
lowed. Inspections should be made as necessary to ensure safe operation under prevailing conditions.
All rotating power transmission products when used in a drive are potentially dangerous and must be
guarded by the user as required by applicable laws, regulations, standards, and good safety practice.
(Refer to ANSI Standard B15.1.)
14.6 Torque Wrench Effective Length
To recalculate a torque reading when using a torque adapter, use the following formula, and refer to
Figure 98:
TW = TA*L
L + A
TW is the torque setting or dial reading on the wrench.
TA is the torque specification (the actual amount of torque that should be applied to the fastener).
A is the amount that the adapter increases (or reduces) the effective lever length, as measured along
the centerline of the torque wrench.
Removal:
1. Loosen and remove the capscrews.
2. Insert capscrews in the tapped removal
holes.
3. Tighten the inserted screws until the
sprocket is loose on the shaft.
4. Remove the sprocket from the shaft.