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V-Belts
Installation Guide
9
V-Belts
Installation Guide
Insert the bushing in the hub and slide it onto the shaft. Align a
threaded hub hole with non-threaded bushing hole.
Start the setscrews into the holes that are threaded in the hub
only. Do not tighten the setscrews yet.
Align both edges of the sheave with the edges of its
mating sheave.
Tighten the screws alternately and evenly. This procedure will
wedge the bushing inward and cause it to contract evenly and
grip the shaft.
8. How to remove a sheave made with a
taper-lock hub
Remove all the setscrews.
Place two of the setscrews in the holes that are threaded in the
bushing only.
Turn the setscrews alternately and evenly. This movement will
unlock the grip and permit easy removal of the assembly with
no shock to the bearings or machinery.
9. Check alignment
Proper alignment is essential for long V-belt life. Check belt
alignment whenever you maintain or replace belts or
whenever you remove or install sheaves. Limit misalignment
to 1/2 degree or approximately 1/10 inch per foot of
center distance.
The illustration above shows the correct way to check
alignment between two sheaves with a straight edge. Check
both front and back alignment. Straight edge should touch
sheaves at the four points indicated.
Non-parallel shafts or sheaves not aligned axially can cause
angular misalignment.
Laser Alignment Tool
With our Laser Alignment Tool, you can quickly align drive
components to improve efficiency and reduce costly
maintenance. Much easier to use than a straight edge, it
attaches in seconds and when the highly-visible sight line lies
within the target openings, the pulley/sprockets are aligned.
10. Identify correct belt
Always select belts to match sheave grooves. Use a sheave
groove gauge to determine the proper belt cross section
(Figure A).
Use a belt gauge to verify the old belt cross section when belt
identification is no longer legible (Figure B).
8V
Over 22.4
O.D.
42°
Up to 16.00
O.D.
38°
16.00 Thru 22.4
O.D.
40°
Figure A
8V
5V
3V
1in.
5/8 in.
3/8 in.
Figure B
Misaligned
Aligned