YATO YT-81980 Manual Original página 17

GB
Note! The drill rig must be placed in the head in such a way to assure possibly best access to the main grip and the electric switch.
The grip and the power supply cable must not hamper moves of the head.
Installation of the bit
The bit is installed by tightening it into the drill rig's spindle. Thread of the bit must fi t the thread of the drill rig. It is prohibited to
modify threads in order to adjust them. It is prohibited to use adapters which adjust a bit to the installation system of the spindle.
Before installation of a bit check condition of both of the threads - of the bit and of the spindle. Threads must be clean and free
from damages. If necessary clean the threads by means of a brush with artifi cial bristle or a soft cloth.
In the axis of the spindle there is an outlet for cooling water. Check whether it is polluted. It is simpler to do it before the bit has been
installed. If necessary clean the water outlet carefully by means of a thin wooden stick or a stick made from the artifi cial bristle.
Do not use sharp, metal objects, which could damage the water supply system. If contaminants cannot be removed contact the
manufacturer's authorized center.
Install a bit by tightening it into the spindle in such a way that the spindle thread is totally covered. The connection must be tight-
ened by keeping the spindle by means of one of wrenches and tightening it by means of the other wrench (XIII).
Disassembly of the bit must be carried out by untightening it by means of a wrench while holding it by means of the other wrench.
Installation and disassembly of the bit takes place by means of manual wrenches. The bit will tighten itself during operation of the
tool which means that disassembly of the bit may require higher forces compared to installation.
Connection of the cooling water
Note! Use water only to cool down. It is prohibited to use other liquids. Water intended for cleaning must be clean and free from
any contaminants which could limit or block fl ow of the water.
If this is possible use the water cooling system. It enables to extend the operation time of bits and the drill rig itself and to reduce
quantity of the dust during work. Check whether the water valve of the product is closed and the valve's lever is parallel to the main
grip (XIV). Insert a hose of the internal diameter presented in the technical data table into the stub pipe of the valve (XV). Check
whether the hose does not slide down the stub during operation. If necessary secure the connection by a bracket. Do not tighten
the bracket too much in order to not damage the hose.
Open fl ow of the water into the valve. Water must be supplied to the water connection under pressure not exceeding the one
stipulated in the table with technical data. Check whether connection of the hose on the stub of the valve does not indicate any
leaks. Open the water valve by turning the lever in such a way to make it perpendicular to the main grip (XVI).
Check whether water leaves the outlet jet.
Note! In case when the end of the bit at the time of operation becomes higher than the end of the spindle, e.g. when mak-
ing holes in a ceiling, make sure that the water does not fl ow into the drill rig. The drill rig is not tightened and contact
of the water with the electric systems of the product may result in electric shock which could result in serious injures
including death.
In such a case drill without the water cooling or use an external unit to collect excess of the water (available separately) connected
to industrial vacuum cleaner, designed for wet operation (available separately).
Water system must be installed in such a way that it does not hamper operation of the product and it does not prevent access to
the grip and switch.
Test of the earth fault breaker
The product is equipped with an automatic earth fault breaker connected to the power cord near the plug. Before commence of
the supply its operation must be tested. Make sure that the switch key of the tool is in its off position, the bit has been dismounted
and the spindle has no contact with any object. Connect supply cable plug to the network socket. Press the TEST button located
at the enclosure of the PRDC earth fault breaker, control lamp at the earth fault breaker is off . Press the RESET button and then
start the product by pressing the earth fault breaker, the control lamp must be on.
In case the control lamp does not go off after the TEST button has been pressed or when it goes off immediately after the product
has been started, stop operation of the product, unplug the unit and have the machine repaired in an authorized service center.
Note! It is prohibited to use the product with damaged earth fault breaker.
Start of the product
Before commence of operation always carry out an initial start up which enables checking correctness of the product operation.
Make sure that switch key of the tool is in the on position and plug of the power cord is unplugged from the socket.
Install the bit and connect the water fl ow. Both of the operations must be carried out acc. to the guidelines. Close the water valve.
Make sure that the bit has no contact with any object. Insert the plug into the power supply socket.
Press the RESET button on the earth fault breaker and open the water valve.
Press and hold the switch key; it will start the product. The more pressure on the switch key the higher rpm of the bit. Maximal
pressing of the switch key results in its nominal rpm value. The product must operate approx. 30 s. with a nominal rotary speed.
At this moment check whether the bit does not show any traces of axial run-out, the product does not vibrate and it does not emit
too much noise, there is no smoke or any suspicious odors. Check whether fl ow of water in the cooling system is not disturbed
in any way.
O R I G I N A L I N S T R U C T I O N S
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