Poulan 3400 - Manual (Page 17)

b. CHAIN REPLACEMENT
1. ) Replace the chain when cutters or links
break.
2. ) See a qualified service dealer to replace
and sharpen individual cutters for^atch-
ing your chain.
3. ) Always replace the worn sprocket when
installing a new chain to avoid excessive
wear to the chain.
2. GUIDE BAR MAINTENANCE
• Conditions which can jcequire guide bar
maintenance:
—saw cuts to one side
—saw has to be forced through a cut
—inadequate supply of oil to bar and
chain.
Check the condition of the guide bar each
time the chain is sharpened. A
worn guide
bar win damage the chain and make cut­
ting more difficult.
Replace the guide bar when:
—the inside groove of the guide bar rails is
worn.
—the guide bar is bentorcracked.
a. Remove the guide bar to service.
b. Clean oil holes at least once for each
five hours of operation.
c. Remove sawdust from the guide bar
groove periodically with a putty knife or
a wire. Figure 36.
d. Remove burrs by filing the side edges
of the guide bar grooves square with a
flat file.Figures/.
e. Restore square edges to an uneven rail
top by filing with a flat file. RgureSZ.
M ilfl lU
CORRECT
GUIDE BAR
GROOVE
WORN GROOVES
Figure 37
FILE EDGES
SQUARE
B, IGNITION AND EXHAUST SYSTEMS
• Carbon deposits will build up on exhaust ports,
spark arrestor, muffler, and spark plug as the saw
is used. All of these parts should be cleaned at the
same time to prevent engine damage, overheating,
loss of power, and hard starting.
• Clean parts:
—as required
^at least once for each 25-30 hours of opera­
tion
1. COOLING AND EXHAUSTSYSTEM
• Carbon build-up on the cooling and exhaust
system can cause the engine to lose power
in a cut.
• Keep the spark arrestor clean at all times.
• Replace the spark arrestor when breaks in
the screen are found.
Items required:
—wire brush
— 3/8"wrench
— hardwood stick
a. Disconnect the spark plug.
b. Remove the muffler, baffles, and screen. Fig-
ure38.
Puli the starter rope until the piston moves far
enough to close the exhaust ports.
Scrape the carbon deposits from the exhaust
ports and surrounding exhaust chamber using a
hardwood stick. Figure 39.
c.
d.
[CAUTION: iDo not use a metallic scraping tool
to avoid damage to the piston.
e. Blow out loosened carbon with compressed air.
f. Glean the spark arrestor screen with a wire
brush or replace if breaks in the screen afe
found.
g. Reassemble muffler parts.
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