Wexxar WF30T, Operation And Service Manual

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WF30T Case Former Machine Maintenance
- 9-87 -
forces generated. A rotating collar on the shock absorber is used to make this adjustment.
Adjustable shock absorbers are adjusted after the desired speed of the mechanism has been set.
The measurements are marked on a rotating collar on the bottom of the shock absorber.
Changing this setting requires a 1/16” Allen Key, which is included with sealed shock absorbers in
the Spare Parts Kit shipped with your machine. The Allen Key fits in a small capscrew on the
side of the shock absorber just above the rotating collar.
To set a shock absorber,
1) Loosen the capscrew by turning counter-clockwise. Adjust the setting by rotating the
collar until the desired value is opposite the red notch above the collar.
2) Start from a ‘soft’ setting.
3) Gradually increase the hardness until the component comes to a smoothly controlled
stop at the end of its travel. If the mechanism bounces when it hits the shock absorber
and then takes considerable time to complete its travel, the setting is too hard.
4) Retighten the capscrew.
Shock absorber settings are most critical on fast-running machines.
9.4.10 Conveyor Belt Tension & Tracking
The correct belt tension is factory-set on new machines, but the
tension will decrease when the machine is in service, particularly in
the first few months, and will require regular adjustment to maintain
correct case transfer. Two adjusting screws are located under
each idle pulley. They are threaded rods with nuts. There is also a
locking bolt that secures the idle pulley square shaft to the
mounting channel. To remove the belt, loosen the locking bolt, and
back the nuts off to release all tension.
When re-tensioning the belt, use the nut on the top threaded rod to
take up the slack and increase tension, and use the nut on the
bottom rod to control the angle of pulley shaft. Adjusting the top
and bottom nuts together controls both the tension and the tracking
of the belt. The angle of the shaft should be adjusted so that the
pulley is centered on the belt, and does not want to ride up or down
when running. Re-tighten the locking bolt to secure the shaft after
adjusting.
Correct belt tension is a one percent stretch. If in doubt about how
much to tension the belts:
1. Slacken off to the no-load condition.
2. Place two marks on the belt 25" apart.
3. Tension until the marks are 25¼" apart
Figure 9-1: Conveyor
Belt Tensioning