Product manual

44 McQuay IM 782-4
Service and Maintenance
Figure 41: Sheave Adjustment
Figure 42: Sheave Adjustment
Center lines
must coincid
e
Must be
parallel
Must be
parallel
Adjustable
sheave
Motor
Bearing
Table 33: Screw Torque Values
Nominal screw
size
(dia-thds/in)
Socket head
cap screws
Flat head
socket screws
Hollow head setscrews only
Lengths equal or greater than
diameter
For lengths (L) less than
diameter
Seating torque Seating torque Seating torque Seating torque Length (L) Seating torque
(in-lbs) (ft-lbs) (in-lbs) (in-lbs) (ft-lbs) (in) (in-lbs)
1/4-20NC 150 12.5 100 87 7.3 3/16 50
5/16-11NC 305 25.4 200 165 13.8 1/4 90
3/8-16NC 545 45.4 350 290 24.2 1/4, 5/16 150, 250
1/2-13NC 1300 108.3 N/A 620 51.7 N/A N/A
5/8-11NC N/A N/A N/A 1225 102.1 N/A N/A
Adjustable
center-flange
Fixed
center-flange
Stationary
end-flange
Capscrews
(Do not remove.)
(2) Locking
set screws A
Flathead socket screws
(Do not remove.)
Inner locking-ring
Outer
locking-ring
Split taper
bushing
(3) Holes for
spanner wrench
or drift