Main Parts; Starting And Stopping The Machine - Atlas Copco Pionjar 120 Instrucciones Para El Operario

Main parts

Pionjär 140 (fig. 1a) Pionjär 120 (fig. 1b)
A. Handle (vibration damped on Pionjär 140/150)
B. Fuel screw
C. Choke
D. Air filter
E. Engine piston
F. Compression chamber for flushing air
G. Rotation mechanism (Pionjär 120 and 140)
H. Throttle
I. Starter handle
J. Fuel tank
K. Power take-off
L. Gas duct
M. Impact piston
N. Gas-duct valve
O. Function selector (Pionjär 120 and 140)
P. Tool holder
Starting and stopping the
Machine
Fuel mixing ratios (fig. 2)
Pionjär with cast-iron cylinder: oil-mixed petrol, 1
part oil to 12 parts petrol (8%).
Pionjär with aluminium cylinder: oil-mixed petrol, 1
part oil to 20 parts petrol (5%).
Two-stroke oil
For the best results always use Atlas Copco's biode-
gradable two-stroke oil, wich has been specially de-
veloped for Atlas Copco two-stroke engines. If Atlas
Copco two-stroke oil is not available then use a two-
stroke oil of good quality. Contact your nearest Atlas
Copco dealer for a recommendation of two-stroke
oils.
Starting (figs. 3-6a)
When cold-starting the engine, turn the choke anti-
clockwise (fig. 3).
Turn up the fuel needle (anti-clockwise) toward the
stop (fig. 4a). Pull the starting handle until the engine
starts (fig. 4b).
Open the choke fully by turning it fully clockwise
(fig. 5a).
After starting the engine (fig. 5b), let it warm up for
2-3 minutes before putting the machine to work.
Regulate the fuel supply so that the engine runs
cleanly. During normal operation the fuel needle
should be opened by approx. 0.5 of a turn (fig. 5c).
If the engine does not start, too much fuel may have
entered the combustion chamber. In this case, close
the fuel needle by turning it clockwise, and start the
engine with the choke open.
The engine speed can be regulated by means of the
throttle (fig. 6a). When the throttle is released to the
"up" position, the maximum engine speed is obtain-
ed. Depressing the throttle halfway down gives the
engine idling speed. To stop the engine, simply press
the throttle to the bottom position.
If the machine is frequently started on top of long
tools such as probing rods etc; a starter-cord bracket
must be used to avoid damaging the cord and cord
bushing.
Starter-cord bracket for Pionjär 120, 130, 140,
150: Ordering No. 9238 2803 81.
Stopping the machine (figs. 6a and 6b)
To stop the engine, press the throttle all the way
down to the bottom position (fig. 6a). Then close the
fuel needle by turning it clockwise (fig. 6b).
N.B. Drain the fuel tank if the machine is to be trans-
ported or stored for longer periods of time.
Operating the machine (fig. 7)
Tool shank (fig. 7)
Use a shank gauge to check that the tool shank has
the correct dimensions, i.e. 22x108 mm. Make sure
that the shank is clean and that the tool is in good
condition.
Flushing (fig. 8)
During drilling, make sure that the flushing hole
through the drill steel does not become blocked.
Fitting the tool (fig. 9)
Shut down the machine. Insert the tool shank into the
chuck and lock the tool retainer with your foot.
Function selector - Drilling (fig. 10)
Turn the function selector downward. This engages
rotation and flushing air for drilling.
Function selector - Breaking (fig. 10)
To adjust the direction of the tool blade, first put the
function selector into the neutral position.
Then lock the tool in the desired position by turning
the selector upward. This locks the rotation.
Collaring
Press the tool against the workpiece with the ma-
chine idling. Increase the speed of the engine once
the bit has gained a foothold in the material to be
drilled.
Grip the side handle to give better control of the ma-
chine.
English
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