-36-
Model G0939/G0940 (Mfd. Since 12/20)
Tensioning/
Replacing Drive Belt
The drive belt transfers power from the motor to
the cutterhead, and to the infeed and outfeed roll-
ers. To ensure efficient transfer of power to these
systems, make sure the belt is always properly
tensioned and in good condition.
If the belt is worn, cracked, or damaged, replace
it immediately.
Tools Needed
Qty
Hex Wrench 4mm .............................................. 1
Hex Wrench 6mm .............................................. 1
To tension/replace drive belt:
1. DISCONNECT MACHINE FROM POWER!
2. Raise headstock completely.
3. Remove top and right-hand covers.
4. Remove cutterhead depth stop dial (see
Figure 17 on Page 25).
5. Lift side panel up and away from machine to
expose drive belt and pulleys, as shown in
Figure 38.
6. Loosen motor tension cap screw (see Figure
38) to reduce belt tension, and roll old belt off
pulleys.
7. Loop new belt completely around motor
pulley but only halfway on cutterhead pulley.
8. While applying pressure to belt with one
hand, slowly rotate motor pulley to fully seat
belt in grooves.
Note: Belt is correctly tensioned when there
is approximately
3
⁄
8
" deflection when moder-
ate pressure is applied midway between pul-
leys, as illustrated in
Figure 39. Lift motor to
adjust deflections, then tighten motor tension
cap screw.
Figure 38. Drive belt and pulleys.
Motor Pulley
Cutterhead
Pulley
Belt
Motor Tension
Cap Screw
Cutterhead
Pulley
Approximately
3
⁄
8
" Deflection
Motor
Pulley
Figure 39. Correct amount of belt deflection.
9. When belt is fully on both pulleys, rotate it
several times to make sure belt ribs are prop-
erly seated in pulley grooves.
— If belt ribs are not properly seated, roll belt
off pulleys and repeat
Steps 6–8 until they
are.
10. Replace side panel, secure top cover, and
re-install cutterhead depth stop dial.
