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4) Round off front corner to maintain original shape of depth gauge
after using depth gauge tool. Always follow the recommended
depth gauge setting found in the maintenance or operator
manual for your saw. (Fig. 44)
Fig. 44
GENERAL INSTRUCTIONS FOR FILING CUTTERS
File (55) cutter on one side of the chain from the inside out. File on
forward stroke only. (Fig. 45)
54
5454
55
55
55
Fig. 45
5) Keep all cutters the same length. (Fig. 46)
Fig. 46
6) File enough to remove any damage to cutting edges (side plate
(56) and top plate (57)) of cutter. (Fig. 47)
55
56
56
57
Fig. 47
SHARPENING ANGLES FOR SHARPENING SAW CHAIN
1. Part Number 91VG
2. Pitch 3/8”
3. Depth Gauge Setting 0.025"
4. Side Plate Filing Angle 80°
5. Top Plate Angle 30°
6. File Guide Angle 90°
Maintenance schedule
Below you will fi nd some general maintenance instructions. For
further information please contact HITACHI dealer.
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 oil fi lter port in the guide bar.
○ Clean the side case of saw dust.
○ Check that the saw chain is sharp.
○ Check that the bar nuts are suffi ciently tightened.
○ Make sure that the chain transport guard is undamaged and that
it can be securely fi tted.
○ Check that nuts and screws are suffi ciently tightened.
Especially inspect the bolt of muffl er and ensure that they are
properly tightened before starting engine. Should any of the
bolts be loose, retighten them immediately. Failure to do so
could result in serious hazard.
○ Check the tip of the 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.
Weekly maintenance
○ Check the recoil starter, especially cord and return spring.
○ Clean the exterior of the spark plug.
○ Remove the spark plug and check the electrode gap. Adjust it to
0.024” (0.6 mm) or change the spark plug.
○ Clean the cooling fi ns on the cylinder and check that the air
intake at the recoil starter is not clogged.
○ Clean the air
fi lter.
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.
○ Clean the fan and the space around it.
○ Clean the muffl er of carbon.
NOTE
When ordering the parts to your nearest dealer, please use the
item numbers showing on the parts breakdown section in this
instruction.
BAR NO.
LENGTH-
TYPE
NOSE-
TYPE
CHAIN NO.
(OREGON)
MODEL NO.
E&S
PO12-50CR
PO14-50CR
12″
14″
SPROCKET
SPROCKET
91VG045
91VG052