Chain And Guide Bar Assembly; Maintenance And Inspection - Hitachi CS 35B Handling Instructions Manual

1. Blade sharpening
The accessory round file should be held against
the chain blade so that one-fifth of its diameter
extends above the top of the blade, as shown in
Fig. 13. Sharpen the blades by keeping the round
file at a 30° angle in relation to the guide bar, as
shown in Fig. 14, ensuring that the round file is
held straight, as shown in Fig. 15. Ensure that all
saw blades are filed at the some angle, or the
cutting efficiency of the tool will be impaired.
Appropriate angles for sharpening the blades
correctly are shown in Fig. 16.
2. Adjustment of depth gauge
To perform this work, please use the optional
accessory depth gauge jointer and a standard flat
file obtainable in local markets. The dimension
shown in Fig. 17 is called the depth gauge. The
depth gauge dictates the amount of incision (cut-
in), and must be accurately maintained. The
optimum depth gauge for this tool is 0.5 mm. After
repeated blade sharpening, the depth gauge will
be decreased. Accordingly, after every 3–4
sharpenings, place the depth gauge jointer as shown
in Fig. 18, and file away that portion that protrudes
above the upper plane of the depth gauge jointer.

CHAIN AND GUIDE BAR ASSEMBLY

1. Mounting
(1) Loosen the bolt with the accessory wrench and
remove the chain cover. Please be careful not to
lose the spring washer attached to the bolt.
(2) Mount the chain on the guide bar, and fit the chain
to the sprocket as shown in Fig. 19. Ensure that
the chain cutters are positioned as shown in the
insert in Fig. 20.
(3) After fitting the adjustment pin to the guide bar
hole, mount the guide bar to the main unit mounting
section, and insert the chain into the guide bar
groove, as shown in Fig. 20.
(4) Replace the chain cover and loosely tighten the
bolt. Ensure that the spring washer is properly
mounted on the bolt.
(5) After properly adjusting the chain tension as
directed herein, use the accessory wrench to firmly
tighten the bolt.
2. Removal
(1) Loosen the bolt with the accessory wrench and
remove the chain cover. Please be careful not to
lose the spring washer attached to the bolt.
(2) By moving the guide bar in the direction indicated
by the arrow in Fig. 21, the guide bar will come
off and the chain can be removed from the sprocket.

MAINTENANCE AND INSPECTION

1. Inspecting the Chain
(1) Be sure to occasionally inspect the chain tension.
If the chain has become slack, adjust the tension
as directed in the section entitled "Adjusting the
Chain Tension".
(2) When the chain blades become dull, sharpen them
as directed in the section entitled "Sharpening of
Chain Blade".
(3) When sawing work has been completed, thoroughly
oil the chain and guide bar by depressing the oil
button three or four times while the chain is rotating.
This will prevent rusting.
2. Cleaning the Guide Bar
When the guide bar groove or the oil hole become
clogged with sawdust, oil circulation becomes
impaired, which could result in damage to the tool.
Occasionally remove the chain cover and clean the
groove and oil hole with a length of wire, as shown
in Fig. 22.
3. Inspecting the carbon brushes (Fig. 23)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones having the same carbon
brush No. shown in the figure when it becomes
worn to or near the "wear limit". In addition, always
keep carbon brushes clean and ensue that they
slide freely within the brush holders.
[Replacing the carbon brushes]
Disassembly
(1) Loosen the two machine screws on the tail cover,
and remove the tail cover in the direction indicated
by the arrow in Fig. 24.
(2) Loosen the machine screw (made of brass), and pull
out the carbon brush as shown in Fig. 25.
CAUTION
Be careful not to deform the brush holder during
this operation.
Assembly
(1) Insert the new carbon brush and, after aligning the
holder plate and terminal as shown in Fig. 25,
reinsert and tighten the machine screw (made of
brass).
(2) Mount the tail cover and refasten it with the two
machine screws. Exercise the utmost care to prevent
the lead wire from approaching the armature or
from being caught in the tail cover.
CAUTIONS
Please be sure to follow the above assembly method
without fail. Should the lead wire contact the
armature or become caught in the tail cover, there
is danger of electric shock.
When replacing a carbon brush, never touch any
components inside the motor other than those
necessary to effect replacement.
4. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Failure
to do so could result in serious hazard.
5. Maintenance of the motor
The motor unit winding is the very "heart" of the
power tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
6. Chain brake (CS35B)
If a chain saw hits a solid object at a high seed
it reacts violently and kicks back. This is difficult
to control and could be dangerous, especially with
lightweight tools that tend to be used in all kind
of positions. The chain brake immediately stops the
chain from rotation if there is an unexpected kick-
back. The chain brake can be activated by pressing
your hand against the handguard or automatically
by the kick-back itself.
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