Use and Care Manual

-37-
W1812 Owner's Manual (Mfd. Since 02/11)
SERVICE
After long-term machine use, the rubber pad on the end
of the drive chain tensioner (see Figure 59) will wear.
The result is that the drive chain will become overly slack
and can jump its sprockets, causing damage. This situation
can be avoided by removing the excess chain slack.
When properly adjusted, keep in mind that the chain
should not be in tension like a V-belt, but rather it should
hang slightly with 3-5mm of hanging slack (see Figure
60), so the sprocket shafts are free floating with no chain
tension against them.
To remove excess chain slack, do these steps:
1. DISCONNECT MACHINE FROM POWER!
2. Raise the headstock until you have easy access to the
chain area.
3. Loosen the lock nut on the chain tensioner screw (see
Figure 61).
4. Use a 4mm hex wrench to adjust the tensioner until
there is 3-5mm of hanging slack in the chain (see
Figure 60).
5. Tighten the lock nut, and test the operation.
Drive Chain Adjustment
Figure 59. Drive chain tensioner rubber pad.
Figure 61. Chain tensioner screw location.
Figure 60. Chain slack examples.
Chain Tensioner
Rubber Pad
Excessive
Chain Slack
Correct Chain
Slack 3-5mm
Chain
Tensioner
Screw