Pruning Techniques; Maintenance - Hitachi CG-PSB Handling Instructions Manual

○ After adjustment has been made, tighten fi xing screw
(17). (Fig. 12)
NOTE
When you have lost the proper position of the screw (18),
start with the most counterclockwise position.

PRUNING TECHNIQUES

This attachment is designed for pruning small limbs
and branches up to 8" in diameter. Follow these tips for
successful operation.
○ Plan cut carefully. Check direction branch will fall.
○ Long branches should be removed in several pieces.
○ Do not stand directly beneath branch being cut. Falling
limbs may bounce when they hit the ground.
○ When ready to cut:
Hold "front cutting guide" against branch. This will
prevent whipping of the branch. DO NOT use back and
forth sawing action. (Fig. 14)
○ Look out for branch immediately behind the branch
being cut. If blade hits rear branch damage to blade may
occur. (Fig. 15)
○ Accelerate to full throttle.
○ Apply a light cutting pressure.
○ Ease cutting pressure when nearing end of cut to
maintain control.
○ When pruning a limb 4 inch diameter or larger, cut as
follows: (Fig. 16)
1. Undercut 1/4 limb diameter near tree trunk.
2. Finish top cut slightly farther out on limb.
3. Flush cut stub at trunk.
○ DO NOT use for felling or bucking.

MAINTENANCE

Oiler port (Fig. 17)
Clean the chain oiler port (19) whenever possible.
Guide bar (Fig. 18)
Before using the machine, clean the groove and oiler port
(20) in the guide bar.
Side case (Fig. 19)
Always keep the side case and drive area clean of saw dust
and debris.
Gear case (Fig. 20)
Check gear case for grease level about every 50 hours of
operation by removing the grease fi ller plug on the top of
gear case.
If no grease can be seen on the fl anks of the gears, fi ll the
gear case with a quality lithium based multipurpose grease
up to 3/4.
Do not completely fi ll the gear case.
CHAIN SHARPENING
Parts of a cutter (Fig. 21, 22)
WARNING
○ Gloves should be used when sharpening chain.
○ Be sure to round off the front edge to reduce the chance
of kickback or tie-strap breakage.
21. Top plate
22. Cutting corner
23. Side plate
24. Gullet
25. Heel
26. Chassis
27. Rivet hole
28. Toe
29. Depth gauge
30. Correct angle on top plate (degree of angle depends on
chain type)
31. Slightly protruding "hook" or point (curve on non-chisel
chain)
32. Top of depth gauge at correct height below top plate
33. Front of depth gauge rounded off
LOWERING DEPTH GAUGES WITH A FILE
WARNING
○ Do not smoothen the upper part of the guard tie straps
(34) or bumper drive links (35) with a fi le or deform them.
(Fig. 23)
○ Adjust the depth gauge to the specifi ed setting.
Failure to observe the above raises the possibility of a
kickback and may result in injury.
1) If you sharpen your cutters with a fi le holder, check and
lower the depth.
2) Check depth gauges every third sharpening.
3) Place depth gauge tool on cutter. If depth gauge projects,
fi le it level with the top of the tool. Always fi le from the
inside of the chain toward an outside cutter. (Fig. 24)
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 chain saw.
(Fig. 25)
GENERAL INSTRUCTIONS FOR FILING CUTTERS
File (36) cutter on one side of the chain from the inside out.
File on forward stroke only. (Fig. 26)
5) Keep all cutters the same length. (Fig. 23)
6) File enough to remove any damage to cutting edges
(side plate (37) and top plate (38)) of cutter. (Fig. 27)
SHARPENING ANGLES FOR SHARPENING SAW CHAIN
The SHARPENING ANGLES FOR SHARPENING SAW
CHAIN of this machine are listed in the table on page 44.
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
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 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.
Monthly maintenance
○ Clean chain oil fi lter.
7
English