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10
Maintenance of the Saw Chain and
Guide Bar
SAW CHAIN
WARNING!
It is very important for smooth and safe operation to
always keep the cutters sharp.
Your chain saw cutters need to be sharpened when.
• Sawdust becomes powder like.
• You need extra force to saw.
• The cut way does not go straight.
• Vibration increases.
• Fuel consumption increases.
Cutter setting standards.
WARNING!
Be sure to wear safety gloves when servicing.
Before ling:
• Make sure the saw chain is held securely.
• Make sure the engine is stopped and the spark plug dis-
connected.
• Use a round le of proper size for your chain.
Model MCS25 Chain: 91VG File size: 5/32” (4.0 mm)
Model MCS38 Chain: 91VG File size: 5/32” (4.0 mm)
Model MCS46 Chain: 21VB File size: 3/16 ” (4.76 mm)
Model MCS52 Chain: 21VB File size: 3/16 ” (4.76 mm)
Model YR4503 Chain: 21VB File size: 3/16 ” (4.76 mm)
30˚
90˚
20˚
Fix chain so it can not move.
• Place your le on the cutter and
push straight forward. Keep the le
positioned as illustrated.
• After every cutter has been set,
check the depth gauge and le it to
the proper level.
WARNING!
Be sure to round o the front edge to reduce the chance of
kickback or tiestrap breakage.
Appropriate gauge checker.
11
Make shoulder rounded.
Make sure every cutter has the same length and edge angles
as illustrated.
Depth gauge standard.
x
x
Cutter length
Filing angle
Side plate angle
Top plate angle
30˚
85˚
60˚
GUIDE BAR
• Flip the bar upside down occasionally to promote even
wear.
• The bar rail should always be a square. Check for wear of
the bar rail. Apply a ruler to the bar and the outside of a
cutter. If a gap is observed between them– the rail is nor-
mal.
Good guide bar
Rul-
er
Gap
Guide bar rail
Guide bar needs replacing
No gap. Chain should not move
sideways in the guide rail
Guide bar rail
worn
Trouble shooting
Engine does not start
What to Check Possible Cause Remedy
Does the engine crank?
YES
NO Faulty recoil starter.
Fluid in the crankcase.
Internal damage.
Return chainsaw to dealer
Good compression?
YES
NO Loose spark plug. Excess wear on cylinder,
piston, rings
Tighten and re-test. Return unit to
dealer
Does the tank contain fresh fuel
of the proper grade?
YES
NO Fuel/mixture incorrect, stale, contami-
nated.
Re-ll with fresh fuel (2-cycle
engine oil and gasoline, as speci-
ed.)
Is fuel visible and moving in the
return line when priming?
YES
NO Check for clogged fuel lter and/or vent. Clear as required. Re-start.
Check the spark plug If the plug is wet, excess fuel may be in the
cylinder
Crank the engine with plug
removed. replace the plug and
restart. (Refer to page 7)
The plug may be fouled or improperly
gapped
Clean and regap the plug to
0.65mm. Restart.
The plug may be damaged internally or of
the wrong size.
Replace the plug with the speci-
ed plug. Restart
Low power output
What to Check Possible Cause Remedy
Is the engine overheating? Operator is overworking the machine. Use lower throttle setting.
Carburettor mixture is too lean. Return chainsaw to dealer.
Improper fuel ratio. Re-ll with fresh fuel of the correct
mixture (2-cycle engine oil and
gasoline, in specied ratio Page 5.)
Fan cover, cylinder ns dirty or damaged. Clean, repair or replace as neces-
sary.
Carbon deposits on piston or in the muer. Decarbonize.
Engine is rough at all speeds. Clogged air cleaner element. Service the air cleaner.
May also have black smoke and/ Loose or damaged spark plug. Tighten or replace.
or unburned fuel at the exhaust. Air leakage or clogged fuel line. Repair or replace lter and/or fuel
line.
Water in the fuel. Drain the fuel replace the fuel with
a fresh mix.
Piston seizure. Return chainsaw to dealer.
Faulty carburettor and/or diaphragm. Return chainsaw to dealer.
Engine is knocking. Overheating condition. Idle engine until cool; nd reason
for overheating.
Improper fuel. Check fuel octane rating; check
for presence of alcohol in the fuel.
Refuel as necessary.
Carbon deposits in the combustion
chamber.
Decarbonize
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