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13
OPERATION
35710
WARNING!
Inspect chain tension
often during operation,
especially when breaking in a new
chain. A loose saw chain can
unexpectedly jump the guide bar
during operation, possibly causing
serious personal injury!
IMPORTANT!
Proper chain adjustment is essential
for maximum performance, chain life,
and operator safety. Always inspect
chain tension before operating the saw!
NOTE:
For longest chain life, place new or
replacement chain loops in oil and soak
overnight before installation.
8. Place the saw on a flat surface, and
lift the bar nose slightly.
9. To adjust chain tension:
■ turn the chain tension screw
clockwise to tighten the chain.
■ turn the chain tension adjuster
counter-clockwise to loosen the
chain.
57707
Check the gap between chain side
plates and the bar rail
Chain
Adjusting
Screw
Turn clockwise to tighten
the chain (extend the
guide bar)
■ Hard-nose Guide Bar Gently lift
the chain at about mid-bar. Tension
is correct when there is a gap of
3–3.5 mm (about 0.125") between
the chain side plates and the bar
rail.
■ Sprocket-nose Guide Bar The
chain should be adjusted slightly
tighter than on a hard-nose bar, but
must still pull freely around the bar.
10.Tighten both bar nuts securely,
making sure chain adjustment is
correct for the type of bar installed.
Adjusting Chain Tension in the
Field Stop the saw, loosen both bar
nuts about 1 turn each, then repeat
Steps 8 through 10 (above). Never
operate the saw when the chain is
loose!
Installing and Adjusting the Guide Bar and Saw Chain
28
35720
40/50 Hour Maintenance
■ Replace the spark plug with a
Champion CJ6Y (or equivalent),
gapped to 0.024" (0.6 mm). For EMC
compliance use NGK BPMR 7A.
■ Extract the fuel filter from inside the
fuel tank. Remove and wash both
filter elements in clean fuel. If you
discover damage or deterioration to
the fuel lines or other fuel system
components, remove the saw from
service until it can be inspected by a
Shindaiwa-trained service technician.
CAUTION!
The fuel line can be punctured or
torn by careless handling! Never
use sharp or jagged-edged tools to
extract the fuel line.
35719
10/15 Hour Maintenance
■ Remove and clean the spark plug.
Adjust the spark plug gap to 0.024"
(0.6 mm), and reinstall. If a torque
wrench is available, torque the plug
to 148–165 in.-lbs. Replace a
damaged or visibly worn plug with
a Champion CJ6Y or For EMC
compliance use NGK BPMR 7A.
CAUTION!
Incorrect spark plug installation
can result in serious engine
damage!
Never allow chips or other
debris to enter the cylinder bore!
Before removing the spark plug,
thoroughly clean the spark plug
and cylinder head area!
■ Remove the guide bar and chain.
Carefully inspect the drive sprocket
for wear or damage, and replace if
needed. Inspect the guide bar
grooves and tip for wear or dam-
age, and repair or replace compo-
nents as required.
IMPORTANT!
Always replace the drive sprocket and
cutting chain loop as a set! For
economy, rotate the same 2 or 3
chains daily. When these chains are
worn out, replace both the chains and
the sprocket at the same time.
MAINTENANCE