Electronic Function - Makita GA4590 Instruction Manual

Sw itch action
CAUTION:
Before plugging in the tool, al w ays
check to see that the slide s w itch actuates prop-
erly and returns to the " OFF " position w hen the
rear end of the slide s w itch is depressed.
CAUTION:
S w itch can be locked in the " ON "
position for ease of operator comfort during
extended use. Apply caution w hen locking tool in
the ON position and maintain firm grasp on tool.
T o s t a r t t h e t o o l , p r e s s d o w n t h e r e a r e n d o f t h e s l i d e
switch and then slide it toward the I (ON) position.
F o r c o n t i n u o u s o p e r a t i o n , p r e s s d o w n t h e f r o n t e n d o f
t h e s l i d e s w i t c h t o l o c k i t .
Fig.4: 1. S l i d e s w i t c h
T o s t o p t h e t o o l , p r e s s d o w n t h e r e a r e n d o f t h e s l i d e
switch so that it returns to the O (OFF) position.
Fig.5: 1. S l i d e s w i t c h

Electronic function

Active Feedback sensing Technology
CAUTION:
Hold the tool firmly until the rota-
tion stops.
The tool electronically detects situations where the
wheel or accessory may be at risk to be bound. In such
situation, the tool automatically shuts o the power to
prevent further rotation of the spindle (this does not
prevent kickback).
A t t h i s t i m e , t h e i n d i c a t i o n l a m p b l i n k s i n r e d a n d s h o w s
the Active Feedback sensing Technology is working.
To restart the tool, switch o the tool first, remove the
c a u s e o f s u d d e n d r o p i n t h e r o t a t i o n s p e e d , a n d t h e n
t u r n t h e t o o l o n .
Accidental re-start preventive
function
W h e n p l u g g i n g i n t h e t o o l w h i l e t h e s w i t c h i s O N , t h e
t o o l d o e s n o t s t a r t .
A t t h i s t i m e , t h e i n d i c a t i o n l a m p b l i n k s i n r e d a n d s h o w s
t h a t t h e a c c i d e n t a l r e - s t a r t p r e v e n t i v e f u n c t i o n w o r k s .
To start the tool, turn o the switch, and turn it on again.
Constant speed control
Possible to get fine finish, because the rotating speed is
k e p t c o n s t a n t e v e n u n d e r t h e l o a d e d c o n d i t i o n .
Soft start feature
S o f t s t a r t f e a t u r e r e d u c e s s t a r t i n g r e a c t i o n .
Mechanical brake
Only for model GA4591 / GA5091
M e c h a n i c a l b r a k e i s a c t i v a t e d a f t e r t h e t o o l i s s w i t c h e d
o .
The brake does not work when the power supply is shut
d o w n w i t h t h e s w i t c h s t i l l o n .
ASSEMBLY
CAUTION:
Al w ays be sure that the tool is
switched o and unplugged before carrying out
any w ork on the tool.
Installing side grip (handle)
CAUTION:
Al w ays be sure that the side grip is
installed securely before operation.
Screw the side grip securely on the position of the tool
as shown in the figure.
Fig.6
Installing or removing w heel guard
WARNING:
ap disc, ex wheel or wire wheel brush, the wheel
guard must be fitted on the tool so that the closed side
of the guard al w ays points to w ard the operator.
WARNING:
securely locked by the lock lever w ith one of the
holes on the w heel guard.
WARNING:
/ diamond w heel, be sure to use only the special
wheel guard designed for use with cut-o wheels.
or depressed center wheel, ap disc,
ex wheel, wire wheel brush / abrasi e
cut-o wheel, diamond wheel
1. W h i l e p u s h i n g t h e l o c k l e v e r , m o u n t t h e w h e e l
g u a r d w i t h t h e p r o t r u s i o n s o n t h e w h e e l g u a r d a l i g n e d
w i t h t h e n o t c h e s o n t h e b e a r i n g b o x .
Fig.7: 1. L o c k l e v e r 2. N o t c h 3. P r o t r u s i o n
2. W h i l e p u s h i n g t h e l o c k l e v e r t o w a r d A , h o l d d o w n
the portions B of the wheel guard as shown in the figure.
Fig.8: 1. W h e e l g u a r d 2. H o l e
NOTE: P u s h d o w n t h e w h e e l g u a r d s t r a i g h t .
Otherwise, you cannot secure the wheel guard.
3.
W h i l e p u s h i n g t h e l o c k l e v e r t o w a r d A , r o t a t e t h e w h e e l
guard toward C, and then, change the angle of the wheel
g u a r d a c c o r d i n g t o t h e w o r k s o t h a t t h e o p e r a t o r c a n b e p r o -
t e c t e d . A l i g n t h e l o c k l e v e r w i t h o n e o f t h e h o l e s i n t h e w h e e l
g u a r d , a n d t h e n r e l e a s e t h e l o c k l e v e r t o l o c k t h e w h e e l g u a r d .
Fig.9: 1. W h e e l g u a r d 2. H o l e
T o r e m o v e w h e e l g u a r d , f o l l o w t h e i n s t a l l a t i o n p r o c e -
d u r e i n r e v e r s e .
Clip-on cutting w heel guard attachment
Optional accessory
NOTE: For cutting-o operations, a clip-on cutting
w h e e l g u a r d a t t a c h m e n t c a n b e u s e d w i t h t h e w h e e l
guard (for grinding wheel).
N o t a v a i l a b l e i n s o m e c o u n t r i e s .
Fig.10
14 ENGLISH
When using a depressed center w heel,
Make sure that the w heel guard is
When using an abrasi e cut-o