Hyundai HY2158, User Manual, Page: 7 / 12

Page 7
Always disconnect the machine from the power supply before adjustment,
changing accessories and maintenance.
4.5.1. The keyless chuck fitted to this impact drill allows for the easy
installation and removal of bits and drills. The chuck has two
rotating grips, Fig 3 (1 & 2).
4.5.2. Select the drill /driver bit required and insert it into the chuck
jaws, turn grip 1 in a clockwise direction until jaws grip the
drill/driver bit. With your free hand hold grip 2 firmly and rotate
grip 1 in a clockwise direction until it tightens onto the drill
/driver bit. Do not use unnecessary force to tighten.
5. OPERATION
Before connecting the impact drill to a power supply, make sure it is not in the
‘locked on’ position. Failure to do so could result in accidental starting of the drill
resulting in possible serious injury.
5.1. Switching impact drill ON and OFF.
5.1.1. This machine is fitted with a continuous operation button. To
start the machine squeezes the On/Off trigger, Fig 4.
5.1.2. When the machine starts press in the continuous operation
button located on the side of the handle, Fig 5, release the
On/Off trigger.
5.1.3. The machine will now run continuously without the need to
maintain pressure on the On/Off trigger.
5.1.4. To stop the machine briefly squeeze then release the On/Off
trigger.
5.2. Variable Speed Control.
5.2.1. Light pressure on the On/Off trigger results in low speed,
allowing drilling to begin in a smooth, controlled manner.
Further pressure on the switch results in an increase in speed.
5.2.2. The desired speed can be pre-selected with the thumb wheel,
Fig 6 (also possible during operation). The rotational speed to be
used depends upon the material being drilled.