Maintenance And Inspection - Hitachi С 7BMR Manual De Instrucciones

MAINTENANCE AND INSPECTION

WARNING: To avoid serious accident, ensure the switch is in the OFF position and disconnect the plug
from the receptacle during maintenance and inspection.
1. Inspecting the saw blade:
Since use of a dull saw blade will degrade
efficiency and cause possible motor malfunction,
sharpen or replace the saw blade as soon as
abrasion is noted.
CAUTION:
If a dull saw blade is used, reactive force is
increased during cutting operation. Avoid the use
of the dull saw blade without repair.
2. Check the screws
Loose screws are dangerous. Regularly inspect
them and make sure they are tight.
CAUTION:
Using this power tool with loosened screws is
extremely dangerous.
3. Inspecting the carbon brushes (Fig. 18)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush with
a new one when it becomes worn to its wear limit.
Always keep carbon brushes clean and ensure that
they slide freely within the brush holders.
(6mm)
0.67"
(17mm)
CAUTION:
Using this circular saw with a carbon brush which
is worn in excess of the wear limit will damge the
motor.
NOTE: Use HITACHI carbon brush No. 38 indicated in
Fig. 18.
4. Replacing carbon brushes:
Remove the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed. (Fig. 19)
Wear limit
38
0.24"
No. of carbon
brush
Fig. 18
Brush cap
5. Performance checkup and maintenance of safety
cover
Keep the safety cover in good shape for smooth
performance at all times. Be sure to make prompt
repair in case of any malfunction.
6. Adjusting the base and saw blade to maintain
perpendicularity
The angle between the base and the saw blade
has been adjusted to 90°, however should this
perpendicularity be lost for some reason, adjust
in the following manner.
(1) Turn the base face up (Fig. 20) and loosen the lever
(A).
Slotted set screw
(2) Apply a square to the base and the saw blade and,
turning the slotted set screw with a slotted-head
screwdriver, shift the position of the base to
produce the desired right angle.
English
Slotted-head
screwdriver
Fig. 19
Square
Base
Fig. 20
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