English

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)

545

545554

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)

556576

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 find 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 fixtures.

○ Check that no damage is observed in the Anti-Vibration springs, and no loosening or damage is observed in their fixtures.

○ Check that no deformation or damage is observed in the front and rear handles.

○ Check that the fixtures for front and rear handles are sufficiently tightened and free of damage.

○ Check that bolts, nuts, etc. used for each part are sufficiently tightened and free of damage.

Daily maintenance

○ Clean the exterior of the unit. ○ Clean the chain oil filter port.

○ Clean the groove and oil filter 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 sufficiently tightened.

○ Make sure that the chain transport guard is undamaged and that it can be securely fitted.

○ Check that nuts and screws are sufficiently tightened. Especially inspect the bolt of muffler 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 fins on the cylinder and check that the air intake at the recoil starter is not clogged.

○ Clean the air filter.

Monthly maintenance

○ Rinse the fuel tank with gasoline, and clean fuel filter. ○ Clean chain oil filter.

○ Clean the exterior of the carburetor and the space around it. ○ Clean the fan and the space around it.

○ Clean the muffler 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-

NOSE-

CHAIN NO.

 

TYPE

TYPE

(OREGON)

 

 

MODEL NO.

PO12-50CR

12″

SPROCKET

91VG045

E&S

PO14-50CR

14″

SPROCKET

91VG052

14