11
the pusher leg, or when there is a tendency to jam� When the trig-
ger is released, the feed control setting is activated again�
Oil regulating valve
Oil dosing is controlled by means of a screwdriver�
Check that sufficient lubrication is obtained by putting your hand
in front of the exhaust port while adjusting the regulating valve�
If the hand is covered by a thin film of oil after a few seconds, the
lubricator has been correctly adjusted�
The amount of oil going into the rock drill increases when turning
the valve counter clockwise, and it decreases when turning the
valve clockwise� Oil consumption is 2�5–6 ml/minute�
Note! Tighten the nut after regulation�
Note! To much oil will have negative effects on the operation
whilst to little will result in damage to parts as the temperature
rises during operation�
Operation
Involuntary start�
WARNING
Involuntary start of the machine may cause injury�
• Keep your hands away from the start and stop device until you
are ready to start the machine�
• Learn how the machine is switched off in the event of an emer
-
gency�
• Stop the machine immediately in all cases of power supply
interruption�
Drilling
Starting the rock drill
1� Open the main valve for compressed air�
2� Open the cock for the flushing water�
3� Adjust the feed control lever to give a suitable feed force for
collaring the hole�
4� Align the rock drill so that the working tool touches the desired
collaring point�
5� Move the throttle lever forward a little, which will start water
flushing, percussion and rotation�
6� Collar the hole with reduced feed force�
7� Move the throttle lever fully forward once the working tool has
gained a secure footing in the rock�
Adjust the feed force by means of the control lever so that the 8�
maximum penetration rate is obtained�
The start-and-stop device of Pusher Leg Rock Drill YT29A can
cause a risk of an unimtentional start� To reduce and avoid causing
the risk of unintentional start, the control valve og inlet hose must
be switched off while the rock drill is put aside for long time�
Note! Do not bend the working tool as this will increase wear of
the shank bushing and piston� Furthermore, it can also affect drill
-
ing efficiency and increase the risk of working tool breakage�
Stopping the rock drill
Pull the throttle lever backwards, which will stop percussion, rota-
tion and flushing water�
Re-positioning the pusher leg
1� Switch off the rock-drill percussion and flushing by means of
the throttle lever�
2� Press the trigger, whereupon the piston rod is pulled back into
the pusher-leg cylinder automatically�
3� Re-position the pusher leg�
4� Release the trigger, whereupon the piston rod will move out
-
wards again�
5� Move the throttle lever forward into the working position�
Note! The feed control lever does not need to be touched through
-
out this operation�
Blow-cleaning the drill hole
Whipping air hose�
DANGER
A compressed air hose that comes loose can lasharound and
cause personal injury or death
• Check that the compressed air hose and the connections are not
damaged�
• Check that all compressed air connections are properly attached�
Move to the side and cover your eyes before starting to blow-
clean the drill hole� When blow-cleaning, particles and dirty
flushing water can emerge at speed from the drill hole��
CAUTION
• Always wear impact resistant eye protection with side protection
to avoid injury�
• Make sure that no co-workers are in range when blow-cleaning�
If powerful blow-cleaning of the drill hole is required, turn the
throttle lever fully backwards beyond the stop position for extra
blowing, whereupon the rock drill stops� This can be done during
drilling� When the drill hole is clean, turn the throttle lever for
-
wards again to re-start the rock drill�
When you have finished drilling
Run the rock drill at medium speed when retracting the working
tool from the drilled hole�
Lay down the rock drill on a stone, wooden plank or similar ob
-
ject, so as to prevent drill cuttings and other foreign matter from
entering the chuck�
Turn off the water pressure before the air pressure� Run the rock
drill for a few seconds to clean out water and moisture after the
water has been shut off�
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General