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Page 23
6. Adjusting the Motor Drive/Timing Belt Tension
The HQ
Sweet Sixteen machine utilizes a single motor
drive/timing belt system.
Tools required: 4 mm handle Allen
Check:
With the machine front cover removed, check
the belt tension for tautness by pressing it with the index
fi nger
(Figures 6.1–6.2)
. Press the vertical center of the
belt with approximately 2 lbs of pressure. The belt should
defl ect about ½”. Proper belt tension provides for some
belt fl exibility under light fi nger pressure, but should not
be so tight as to bind the machine. Double-check the
tension by rotating and rocking the hand wheel. Confi rm
that there is no backlash or play between the belt teeth
and any of the driven components. Confi rm also that
there is an immediate transfer of motion to all compo-
nents driven by the belt.
Important:
Do not over-tighten the belt as this will make
the machine too tight and diffi cult to turn and may cause
other undesirable issues.
If a correction is necessary:
• Insert a 4 mm handle Allen tool through the hole in the
main frame casting
(Figure 6.2)
. Loosen the socket-head
belt tensioner screw. Adjust the belt tensioner by press-
ing down on the tensioner and while holding down on the
tensioner re-tightening the belt tensioner screw
(Figure 6.2).
• Note: This adjustment can only be made with the front
cover off so the tensioner can be pressed down to set prop-
er belt tension.
Important: Do not attempt to set with
the front cover on as improper belt tension will result.
Important Note:
Ensure that the special washer with step
is down into the tensioner bracket slot and fl at, not tilted,
when tightened, so the tensioner will not slip, resulting in
a loose belt (
Figures 6.3-6.6
).
Figure 6.1
Figure 6.2
Figure 6.3
Ensure that the special
washer is fl at and in slot.
See Figures 6.4, 6.5, 6.6.
Figure 6.4
Figure 6.5
Figure 6.6