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100647 - ChAiNSAw
2. On the clutch housing, loosen (counter clockwise) the two
13mm nuts (1/4 to 1/2 turn) that secure the housing to the
engine assembly. The nuts need to be loosened enough to
allow the bar to move. Do not loosen the nuts more than 1 full
turn. You will notice that the bar will move with minimal effort
(Fig. 25).
3. On the clutch housing, immediately below the two nuts,
you will find the chain tensioning screw. Insert standard
screwdriver into adjustment screw head slot. While holding
the bar tip up, turn clockwise to tighten chain, (counter
clockwise to loosen).
The desired chain tensioning depends upon temperature of the
saw chain.
– Cold Chain Tension - The chain should fit snuggly against the
underside of the guide bar. No sagging should be visible
(Fig. 26).
– Warm Chain Tension - The steel blade expands when warm
due to use. Approximately 1/16 inch (1.3 mm) of sag should be
visible under the guide bar when warm (Fig. 26).
4. Wearing protective gloves, hold the guide bar tip up and move
the saw chain back and forth along the guide bar (Fig. 27).
Make sure the saw chain moves freely and is in proper mesh
with the sprocket. If the saw chain does not move easily,
slowly turn the chain-tensioning screw counterclockwise to
loosen the saw chain.
The saw chain will not move if the chain brake is engaged.
5. Hold the guide bar tip up and securely tighten the two 13 mm
clutch housing nuts.
If the saw chain was tensioned while warm, it may become too
tight when cooled. Loosen the chain tension after operation
and check the chain tension before the next use.
Flats
Figure 24
NOTiCE
CAUTiON
Drive Links
Guide Bar
Figure 25
Correct cold tension
Figure 26
Figure 27
ImPORTaNT: It is very important to maintain the proper chain
tension. Rapid wear of the guide bar or the chain coming off
easily can be caused by improper tension. Especially when
using a new chain, take good care of it since it should expand
during first use.
MAiNTENANCE
Too loose
Correct warm tension
23
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