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SHARPENING ANGLES FOR SHARPENING SAW CHAIN
1. Part Number
2. Pitch
3. Depth Gauge Setting
4. Side Plate Filing Angle
5. Top Plate Angle
6. File Guide Angle
Maintenance schedule
Below you will fi nd some general maintenance instructions. For
further information please contact Hitachi Authorized Service
Centers.
Inspection and service before use
○ Check that no peel-off , degradation, or damage is observed in
the Anti-Vibration rubber members, and no loosening or damage
is observed in their fi xtures.
○ Check that no damage is observed in the Anti-Vibration springs,
and no loosening or damage is observed in their fi xtures.
○ Check that no deformation or damage is observed in the front
and rear handles.
○ Check that the fi xtures for front and rear handles are suffi ciently
tightened and free of damage.
○ Check that bolts, nuts, etc. used for each part are suffi ciently
tightened and free of damage.
Daily maintenance
○ Clean the exterior of the unit.
○ Clean the chain oil fi lter port.
○ Clean the groove and oiler port in the guide bar.
○ Clean the side case of saw dust.
○ Check that the saw chain is sharp.
○ Check that the guide bar clamp nuts are suffi ciently tightened.
○ Make sure that the guide bar cover is undamaged and that it can
be securely fi tted.
○ Check that nuts and screws are suffi ciently tightened.
○ Check the tip of the guide bar. Please exchange it for the new
one when it is worn out.
○ Check the band of chain brake. Please exchange it for the new
one when it is worn out.
○ Check that the chain does not rotate when the engine is idling.
○ Clean the air fi lter.
Weekly maintenance
○ Check the recoil starter, especially cord.
○ Clean the exterior of the spark plug.
○ Remove the spark plug and check the electrode gap. Adjust it to
0.6 mm or change the spark plug.
○ Check that the air intake at the recoil starter is not clogged.
Monthly maintenance
○ Rinse the fuel tank with gasoline, and clean fuel fi lter.
○ Clean chain oil fi lter.
○ Clean the exterior of the carburetor and the space around it.
Quarterly maintenance
○ Clean the cooling fi ns on the cylinder.
○ Clean the fan and the space around it.
○ Clean the carbon of muffl er.
CAUTION
Cleaning of cylinder fi ns, fan and muffl er shall be done by Hitachi
Authorized Service Centers.
NOTE
When ordering the parts to Hitachi Authorized Service Centers,
please use the item numbers showing on the parts breakdown
section in this instruction.
Guide bar and saw chain combinations
91PX
3/8"
MODEL
0.025"
NO.
E&S
80°
30°
90°
LENGTH-
BAR NO.
TYPE
PO14-50CR
14"
PO16-50CR
16"
NOSE-
CHAIN NO.
TYPE
(OREGON)
SPROCKET
91PX – 52
SPROCKET
91PX – 57
15
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