Narex 00778112, Original Operating Manual

English

17

Mounting with quick-clamping nut

The quick-clamping nut must be tightened or loosened by hand 

only (never use any additional tool!). Mounting of the grinding or 

cutting wheel is the same like for the grinder without the quick-

clamping nut, with the sole difference, that after spindle locking 

the quick-clamping nut (15) may be tightened by hand only.

Attention! Do not tighten the quick-clamping nut without the 

wheel not to damage its mechanism!

Attention! Prior to starting the grinder, verify that the wheel 

does not rotate freely between the bottom flange/the auto-

balancer and the clamping nut.

Putting into operation

Check whether the data on the rating plate match with the real 

power supply voltage. The tool intended for 230 V~ may be also 

connected to 220/240 V~. Check whether the plug type corre-

sponds to the socket type.

Switching on- off

Push the safety lock-off lever  (2) forwards to release the On/Off 

switch lever (1). At the same time, press the on-off switch lever (1) 

to start the grinder and release it to stop.

Continuous operation

Push the safety lock-off lever  (2) forwards to release the On/Off 

switch lever (1). At the same time, press the on-off switch lever (1) 

and push the safety lock-off lever (2) forwards. To turn off continu-

ous operation, press and release the on-off switch (1) again.

Motor electronics

Increases productivity, service life of the grinding machine, com-

fort at work, quality and safety of labour. Its features are as follows:

Restart protection

If power supply is interrupted at work (disconnection of the supply 

cable plug, tripping, cutout, etc.) and the switch remains arrested 

in the ON position, after resumption of power supply the machine 

will not be restarted automatically. To start the grinding machine, 

the switch has to be switched OFF at first and ON afterwards.

Smooth starting

After the grinding machine is switched ON, the control electron-

ics guarantees smooth start and running up to the working speed 

without unnecessary shocks. This way service life of the grinding 

machine may be extended and wear of the gear reduced.

Constant speed

Speed of this grinding machine is constant under the standard 

load (under absolute load relief alike); this way productivity of la-

bour under load does not drop. Note: Thanks to speed reduction 

during no-load operation the noise exposure is reduced as well.

Motor protection from burnout

The control electronics measures motor temperature continuously, 

thus preventing its burnout. If the motor temperature is danger-

ously high, the machine will be switched to the cooling mode au-

tomatically. Do not work with the grinding machine in this state. 

If you work with the overloaded grinding machine, the control 

electronics will switch the motor OFF. If you switch the overloaded 

grinding machine OFF and ON immediately afterwards, the ma-

chine will at first be started to the full operating load and after ca 

2 seconds it will be switched to the cooling mode again. Let motor 

cool at the “cooling” speed. Cooling lasts ca 1 minute as a rule. The 

machine then returns back to the full working speed and you can 

continue working.

Protection from wheel lock

When cutting, the wheel can be locked in the cut. To eliminate the 

risk of operator’s injury or machine burnout, the electronics reacts 

to steep load rise by switching the motor OFF. The stopped motor 

cannot be rotated and a quiet droning can be heard. To restart the 

machine, switch it OFF and ON afterwards.

Grinding and cutting discs

Check that the label on the disc shows the permissible peripheral 

speed or permissible revolution speed.

If the permissible revolution speed is given on the disc, it must not 

be lower than the highest no-load speed of the grinder.

Discs with a permissible peripheral speed of 80  m.s

-1

 and higher 

may be used.

Test new cutting discs by letting them run for about one minute 

with no load.

Unbalanced or vibrating discs should not be used and should be 

discarded.

Protect grinding discs from shock, impact and lubricants.

If the grinding and cutting wheels are worn down to the mark on 

the wheel guard (see the arrow sign), they should be replaced with 

new ones. This maintains the optimum grinding and cutting per-

formance of the machine (peripheral speed of the grinding and 

cutting wheels).

Maintenance and service

Attention! Risk of el. shock. Prior to start any opera-

tion, pull the plug out of the socket!

Vent holes (3) of the motor guard may not be covered.

Cable replacement must be carried out by a specialized service sta-

tion authorized correspondingly.

After ca 200 hours of operation the following activities and 

works have to be carried out:

Check of brush length. The brushes shorter than 5 mm have to be 

replaced for new ones.

The grinder will be stopped automatically if the brushes are worn. 

The grinder is sent to the service station for maintenance.

Grease replacement in gearbox and bearings.

Attention! With respect to protection from el. shock 

and preservation of the class of protection, all mainte-

nance and service operations requesting jig saw case 

removal must be performed by the authorized service centre 

only!

The current list of authorized service centres can be found at our 

website 

www.narex.cz

, section 

“Service Centres”

.

Storage

Packed appliance may be stored in dry, unheated storage place 

with 

temperature not lower than -5 °C.

Unpacked appliance should be stored only in dry storage place with  

temperature not lower than +5  °C with exclusion of all sudden 

temperature changes.

Environmental protection

Power tools, accessories and packaging should be sorted for  

environmental-friendly recycling.

Only for EU countries:

Do not dispose of power tools into household waste!

According to the European Directive 2002/96/EC on waste electri-

cal and electronic equipment and its incorporation into national 

law, power tools that are no longer suitable for must be separately 

collected and sent for recovery in an environmental-friendly man-

ner.