Makita GA5021C - Инструкция по эксплуатации - Страница 10

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Installing or removing wheel guard 

CAUTION: 

• 

When using a depressed center grinding 
wheel/Multi-disc, wire wheel brush or cut-off wheel, 
the wheel guard must be fitted on the tool so that 
the closed side of the guard always points toward 
the operator. 

For tool with locking screw type wheel guard 
Fig.9 

Mount the wheel guard with the protrusion on the wheel 
guard band aligned with the notch on the bearing box. 
Then rotate the wheel guard around 180 degrees 
counterclockwise. Be sure to tighten the screw securely. 
To remove wheel guard, follow the installation procedure 
in reverse. 

For tool with clamp lever type wheel guard 
Fig.10 
Fig.11 

Loosen the lever on the wheel guard after loosening the 
screw. Mount the wheel guard with the protrusion on the 
wheel guard band aligned with the notch on the bearing 
box. Then rotate the wheel guard around to the position 
shown in the figure. Tighten the lever to fasten the wheel 
guard. If the lever is too tight or too loose to fasten the 
wheel guard, loosen or tighten the screw to adjust the 
tightening of the wheel guard band. 
To remove wheel guard, follow the installation procedure 
in reverse. 

Installing or removing depressed center 
grinding wheel/Multi-disc (accessory) 

WARNING: 

• 

Always use supplied guard when depressed center 
grinding wheel/Multi-disc is on tool. Wheel can 
shatter during use and guard helps to reduce 
chances of personal injury. 

Fig.12 

Mount the inner flange onto the spindle. Fit the 
wheel/disc on the inner flange and screw the lock nut 
onto the spindle. 
To tighten the lock nut, press the shaft lock firmly so that 
the spindle cannot revolve, then use the lock nut wrench 
and securely tighten clockwise. 

Fig.13 

To remove the wheel, follow the installation procedure in 
reverse. 

OPERATION 

WARNING: 

• 

It should never be necessary to force the tool. The 
weight of the tool applies adequate pressure. 
Forcing and excessive pressure could cause 
dangerous wheel breakage. 

• 

ALWAYS replace wheel if tool is dropped while 
grinding. 

• 

NEVER bang or hit grinding disc or wheel onto 
work. 

• 

Avoid bouncing and snagging the wheel, especially 
when working corners, sharp edges etc. This can 
cause loss of control and kickback. 

• 

NEVER use tool with wood cutting blades and 
other sawblades. Such blades when used on a 
grinder frequently kick and cause loss of control 
leading to personal injury. 

CAUTION: 

• 

After operation, always switch off the tool and wait 
until the wheel has come to a complete stop before 
putting the tool down. 

Grinding and sanding operation 

Fig.14 

ALWAYS hold the tool firmly with one hand on rear 
handle and the other on the side handle. Turn the tool on 
and then apply the wheel or disc to the workpiece. 
In general, keep the edge of the wheel or disc at an 
angle of about 15 degrees to the workpiece surface. 
During the break-in period with a new wheel, do not work 
the grinder in the B direction or it will cut into the 
workpiece. Once the edge of the wheel has been 
rounded off by use, the wheel may be worked in both A 
and B direction. 

Operation with abrasive cut-off wheel 
(accessory) 

Fig.15 

WARNING: 

• 

When using an abrasive cut-off wheel, be sure to 
use only the special wheel guard designed for use 
with cut-off wheels. 

• 

NEVER use cut-off wheel for side grinding. 

• 

Do not "jam" the wheel or apply excessive 
pressure.    Do not attempt to make an excessive 
depth of cut.    Overstressing the wheel increases 
the loading and susceptibility to twisting or binding 
of the wheel in the cut and the possibility of 
kickback, wheel breakage and overheating of the 
motor may occur. 

• 

Do not start the cutting operation in the workpiece.   
Let the wheel reach full speed and carefully enter 
into the cut moving the tool forward over the 
workpiece surface.    The wheel may bind, walk up 
or kickback if the power tool is started in the 
workpiece. 

• 

During cutting operations, never change the angle 
of the wheel. Placing side pressure on the cut-off 
wheel (as in grinding) will cause the wheel to crack 
and break, causing serious personal injury.