Rev. 9/11/2019
POW-CAR-50 MANUAL
Copyright 2019 Vestil Manufacturing Corp.
Page 9 of 13
ADJUSTING BELT/CHAIN TENSION
The wrapping machine uses 2 belts to rotate the turntable. The tension of each belt occasionally requires
adjustment. For instance, if the turntable vibrates or rattles the tension of the lower belt needs to be adjusted.
Similarly, if the turntable drive motor (or the metal box that supports the motor) vibrates, the tension of the upper belt
should be increased.
1. Adjust the tension of the upper drive belt (inside the power unit housing):
a)
Loosen all four bolts (1) adequately to allow the motor mounting bracket to slide. NOTE: Only
three bolts are visible in the diagram above.
b)
Loosen the outside jamb nuts on the set screws (2).
c)
Remove the end guard by removing both end guard screws.
d)
Assess the belt tension:
Locate the access hole C. Insert a metal rod 3/8” (diameter) x ~10” long, into the access
hole.
Locate the belt with the end of the rod. Lightly contact the belt and do not press the rod into
the belt. Mark the rod flush with hole C with a marker or pencil. Make a second mark
1
/
8
in.
above the first mark (closer to your hand).
Using a pencil-type compression spring scale, measure the force required to push the chain
1
/
8
in., i.e. the force necessary to push the rod to make the second mark flush with hole C.
If necessary, adjust the tension of the belt. If the belt is new, the force measured by the
spring scale should be approximately 16 lb. After the belt is broken in, the force required
should be between 8-12 lb. To adjust belt tension, use a
3
/
16
in. Allen wrench to turn the set
screws (2). To increase tension, turn the screws clockwise. To decrease tension, turn the
screws counterclockwise. Turn both set screws the same amount.
e)
When belt tension is satisfactory, retighten the jamb nuts on both set screws against the bracket
tabs.
f)
Reinstall the end guard and tighten all four of the motor mounting bracket bolts (1).
(Continued on p. 10)
A
A
1
1
1
Carriage
bolt (B)
Lock nut
on carriage
bolt
Carriage
bolt tab
Access
hole (C)
End guard
screw
Jamb nuts (1
outside and 1
inside mounting
bracket tab
Set screw (2)
Motor mounting
bracket tab
Motor mounting
bracket
End guard screw
