12780 San Fernando Road, Sylmar, California 91342 | www.semcopackaging .com | Email: semcoinfo@PPG.com
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13
9. Preventative maintenance (cont.)
Turn OFF/ON Switch to OFF and disconnect compressed air supply prior to opening any mixer
panels. Work should be done in non-hazardous area.
Annually (quarterly for heavy usage)
Inspect air motor belt –
The timing belt drives the rotary bearing shaft,
turning the dasher rod during the mixing cycle.
Cured materials in and around the spindle assembly
can cause it to stall and will result in damage to the
belt.
1. Remove front panel.
2. Inspect physical condition of the timing belt,
looking for any frayed threads or other signs of
wear.
3. The belt should also have minor flexibility when
pressed on. If too loose or tight, the belt could
be damaged.
Changing air motor belt (if damaged) –
1. Remove front panel, rear panel.
2. Remove spindle (see page 12)
3. Remove four M5 bolts around the spindle.
4. Loosen the four bolts on the rear of the mixer
holding the air motor.
5. Slide the air motor toward the injection
assembly.
6. The rotary bearing shaft will slide up and allow
for the old belt to come out and the new belt to
be placed. Tension the new belt appropriately
during step 3 (two people may be needed) while
following steps in reverse order to complete
installation.
Often a damaged belt is caused by a seized rotary
assembly (spindle), so it may require overcoming
any cured material or rust to remove the belt. The
rotary assembly or its components should also be
inspected and may require replacement.
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