Chain And Guide Bar Assembly; Maintenance And Inspection - Hitachi CS-350A Handling Instructions Manual

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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
derected 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 "Setting 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 could result in motor trouble, replace
a carbon brush with a new one when it becomes
worn to or near the "wear limit". In addition,
always keep carbon brushes clean and ensure 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.
25
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.
The chain brake can only be reset after the motor
has stopped completely.
Reset the handle to the rear position. (Fig. 26)
Check the function of the chain brake every day.
NOTE
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning vibration
The measured values were determined according to
EN50144.
The typical weighted root mean square acceleration value:
2
3.0 m/s .