23
OPERATION (cont).
1. Loosen the two chain drive cover nuts (c)
with small open-end spanner (20) (Fig. 30).
Caution:
If you try to rotate the chain tension
screw whilst the chain drive nuts are tight,
it will result in the chain not loosening and
possible damage to the chain tensioning
screw and the chain tensioning pin.
2. Turn the chain tensioning screw clockwise
so that the chain is correctly tensioned
(Fig. 31)
3. To get the correct chain tension, firmly
pull up on the chain at the middle of the
top of the exposed guide bar. When the
chain is pulled up to its highest point,
the bottom tip of the links should only
just stay in the track [middle of the guide
bar] (Fig. 32).
Fig.30
Fig.31
Fig. 32
Chain Tension
4. Once the correct tension has been achieved tighten the chain
drive cover nuts to lock the bar and tension in place.
5. Check the tension again after a few minutes of cutting and
several times in the first hour because the chain will lengthen as
it breaks in. Adjust as you go. A loose chain causes rapid wear
to both the chain and the guard bar and could derail causing a
major safety hazard.
Note:
Chains lengthen slightly as the link pins set into place. They
set into place from the load applied to the chain, this process
continues through-out the life of all chains as they gradually wear
from use.
WARNING!
The chain has sharp edges. For your safety,
please use work gloves.
c
