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HB IOM 1.1 2-13-2014
2.
Check alignment of sheaves:
Fixed sheaves — To check the location
of the fixed sheaves on the shafts, a
straightedge or a piece of string can be
used. If the sheaves are properly lined up
the string will touch them at the points
indicated by the arrows in Fig. 25.
Adjustable sheave — To check the loca-
tion of adjustable sheave on shaft, make
sure that the centerlines of both sheaves
are in line and parallel with the bearing
support channel. See Fig. 24. Adjustable
pitch sheaves are installed on the motor
shaft.
3.
Rotating each sheave a half revolution will
determine whether the sheave is wobbly
or the drive shaft is bent. Correct any mis-
alignment.
4.
With sheaves aligned, tighten cap screws
evenly and progressively.
NOTE: There should be a 1/8-in. to 1/4-
in. gap between the mating part hub and
the bushing flange. If gap is closed, the
bushing is probably the wrong size.
5.
With taper-lock bushed hubs, be sure the
bushing bolts are tightened evenly to pre-
vent side-to-side pulley wobble. Check by
rotating sheaves and rechecking sheave
alignment.
Fig. 25 — Determining Sheave-Shaft Overhang
Fig. 24 — Sheave Alignment
