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CARRIAGE MAINTENANCE
PRE-STRETCH BELT / CHAIN ADJUSTMENT
The pre-stretch belts should be checked for proper tension every 2000 hours of operation. Recommended tension is
1/64” deflection per inch of belt span with a force of approximately 25 lbs. The motor drive belt is adjusted by
loosening the four (4) motor mounting bolts and sliding the motor in the mounting slots. The pre-stretch belt tension is
adjusted with the tension adjustment arm. This arm can be rotated and moved within the mounting slot to obtain
correct tension. Also, make sure the pulleys are at the same level; verify setscrews.
The pre-stretch chains should be checked to ensure the proper tension (approx. every 2000 hours of operation). If
the chains are found to have improper tension they may be adjusted (0.015” of play per foot of chain is
recommended). The motor chain may be adjusted by loosening the four (4) bolts from under the top plate of the
carriage and moving the motor using the slots provided. The pre-stretch chain tension may be adjusted by using the
cam & sprocket. This cam has an eccentric hole and may be turned for chain adjustment.
CARRIAGE IDLER ROLLERS
The surface of the rollers must be smooth. Use #320 grain sandpaper to get rid of any irregularities that could poke
through the film.
CARRIAGE PRE-STRETCH
In order to have a good pre-stretch you need to make sure the idler rollers are pressed up against the pre-stretch
rollers. If there is a gap between the pair, the film will slip through instead of being pinched. To adjust the gap, tighten
the top and bottom springs equally until the aluminum rollers touch the pre-stretch roller. You may want to clean the
aluminum rollers with lacquer thinner (or any degreaser) to increase their grip ability. In order to verify if the gap is
removed, aim a flashlight behind the rollers to see if they are touching properly. When you manually turn the pre-
stretch rollers, the aluminum rollers may turn by themselves.
No gap between
these pairs of
rollers
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