5. Installation
Important:
Do not start the engine until the saw
is fully assembled.
Important:
Wear protective gloves at all times
when handling the chain.
5.1 Fit the chain bar
To ensure that chain is supplied with oil, USE ONLY
THE ORIGINAL BAR which has an oil passage (Fig.
2/Item A).
1.
Make sure the Chain brake lever is pulled back
into the DISENGAGED position (Fig. 3A)
2.
Remove the bar fastening nut (B). Remove the 2
screws of the chain brake cover (C). Remove the
chain brake cover by pulling it straight out with a
strong tug (Fig. 3B).
3.
Using a screwdriver, run the adjustment screw
(D) COUNTERCLOCKWISE until the TANG (E)
(projecting prong) is to the end of its travel toward
the clutch drum and sprocket (Fig. 3C).
4.
Place the slotted end of the guide bar over the
bar bolts (F). Position the bar so that the
adjustment TANG fits into the lower hole (G) on
the guide bar (Fig. 3D).
5.2 To install saw chain
1.
Spread chain out in a loop with cutting edges (A)
pointing CLOCKWISE around loop (Fig. 4A).
2.
Slip the chain around the sprocket (B) behind the
clutch (C). Make sure the links fit between the
sprocket teeth (Fig. 4B).
3.
Guide the drive links into the groove (D) and
around the end of the bar (Fig. 4B).
NOTE:
The saw chain may droop slightly on the lower
part of bar. This is normal.
4.
Pull the chain bar forward until the chain is closely
seated. Make sure that all the drive links are in
the groove of the bar.
5.
Install the clutch cover and tighten the 2 screws.
Make sure the chain does not slip off of the bar.
Install the 2 nuts hand tight and follow tension
adjustment instructions in Section Saw Chain
Tension Adjustment.
5.3 Saw chain tension adjustment
Proper tension of saw chain is extremely important
and must be checked before starting, as well as
during any cutting operation.
Taking the time to make needed adjustments to the
saw chain will result in improved cutting performance
and prolonged chain life.
Warning:
Always wear heavy duty gloves when
handling saw chain or making saw chain adjustments.
1.
Hold nose of guide bar up and turn adjustment
screw (D) CLOCKWISE to increase chain
tension. Turning screw COUNTERCLOCKWISE
will decrease amount of tension on chain. Ensure
the chain fits snugly all the way around the guide
bar (Fig. 5).
2.
After making adjustment, and while still holding
nose of bar in the uppermost position, tighten the
bar retaining nuts securely. Chain has proper
tension when it has a snug fit all around and can
be pulled around by gloved hand.
NOTE:
If chain is difficult to rotate on guide bar or if it
binds, too much tension has been applied. This
requires minor adjustment as follows:
A.
Loosen the bar retaining nut so they are finger
tight. Decrease tension by turning the bar
adjustment screw COUNTERCLOCKWISE
slowly. Move chain back and forth on bar.
Continue to adjust until chain rotates freely, but
fits snugly. Increase tension by turning bar
adjustment screw CLOCKWISE.
B.
When saw chain has proper tension, hold nose of
bar in the uppermost position and tighten the bar
retaining nut securely.
Caution:
A new saw chain stretches, requiring
adjustment after as few as 5 cuts. This is normal with
a new chain, and the interval between future
adjustments will lengthen quickly.
Caution:
If the saw chain is TOO LOOSE or TOO
TAUT, the drive wheel, chain bar, chain and crank
shaft bearing will suffer premature wear. Fig. 6 shows
the correct tension A (when cold) and tension B
(when warm). Fig. C shows a chain that is too loose.
6. Before starting
6.1 Chain break mechanical test
Your chain saw is equipped with a Chain brake that
reduces possibility of injury due to kickback. The
brake is activated if pressure is applied against brake
lever when, as in the event of kickback, operator’s
hand strikes the lever. When the brake is actuated,
chain movement stops abruptly.
Warning:
The purpose of the chain brake is to
reduce the possibility of injury due to kickback;
however, it cannot provide the intended measure of
protection if the saw is operated carelessly. Always
test the chain brake before using your saw and
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