4-50. Belt Tension Adjustment
The conveyor is equipped with an adjustable tail pulley to
maintain the necessary belt tension.
a. Back off lock nuts on adjusting bolts and turn the
b. Tighten until proper belt tension is obtained to
prevent slippage and eliminate most of the belt sag
between troughing rolls. Belt sag should not exceed 1/2
to 3/4 inch between trough roll assemblies spaced on 4
foot centers (1% sag considered normal).
When installed conveyor belt is to stand idle during seasonal
weather change, loosen belt to allow for contraction.
4-51. Belt Training
A slight adjustment of troughing and return rolls can
quickly correct belt travel over rolls and pulleys on the
a. Square the adjustable head pulley and tail pulley
with the frame.
b. Square troughing and return rolls.
c. Start the conveyor and run belt empty at reduced
speed. Check belt travel over rolls and head and tail
pulley and adjust troughing rolls where belt starts to run
Figure 4-38. Conveyor belt fastener installation
off center as follows:
(sheet 2 of 2).
Figure 4-39. Conveyor belt adjustment.