Atlas Copco Pionjar Service manual

Motor Drills
and Breakers

Contents:
Two types of machines_________________________ 4
Correct fuel mixture____________________________ 6
Daily checks __________________________________ 6
Safety first ____________________________________ 8
A tool for every job ____________________________ 10
Cutting and compacting asphalt ________________ 12
Concrete breaking_____________________________ 14
Tie tamping ___________________________________ 15
Drilling________________________________________ 16
Rock splitting _________________________________ 20
Anchoring_____________________________________ 21
Post driving ___________________________________ 22
Fencing_______________________________________ 22
Digging _______________________________________ 23
Accessories___________________________________ 24
More information ______________________________ 26

Atlas Copco motorized drills and
breakers are designed for splitting rocks,
breaking concrete, cutting asphalt, tamping
ballast, digging and other tasks.
This booklet will help you become familiar
with the machines. You´ll find basic tech-
nical information, simple instructions for
their use and an idea of the range of jobs
they are suitable for.
3

4
Two types of machine
cover most applications
• Combined drill/breaker, Pionjär and PICO 14.
Powered by a two-stroke engine with an integrated impact
mechanism, the combined drill/breaker is equipped with
rotation and air flushing mechanism for drilling applica-
tions. The function selector allows you to switch between
drilling and breaking/driving applications.

5
• Heavy duty breaker, Cobra mk1. Also powered by
a two-stroke engine, the Cobra mk1 has a separate im-
pact mechanism activated by pressing the machine
down. Thus, the engine can be run without engaging the
impactmechanism.Aspowerful as a 27 kg (60 lbs) pneu-
matic breaker, the Cobra mk1 is suitable for very de-
manding breaking and driving jobs.

6
Correct fuel mixture
Use the correct fuel mixture, basedonfreshfuelandoil.
Pionjär 120/130 ________ 8%_____ (1:12)
Pionjär 140/150 ________ 5%_____ (1:20)
PICO 14 _________________ 4%_____ (1:25)
Cobra mk1 ______________ 2%_____ (1:50)
Cobra 149/248 _________ 5%_____ (1:20)
Too little oil in the mixture will result in insufficient lubri-
cation and increased wear. Too much oil clogs up ex-
haust ports and channels. Exceptionally dirty fuel filters
should be replaced.
Seeinstruction book for detailedinformationon main-
tenance and servicing.
Daily checks
Simple daily maintenance will ensure trouble-free opera-
tion.
Check the spark plug regularly. Dirty or burnt-out
electrodes impair performance. Check the electrode gap.

7
Electrode gaps:
Pionjär________________________1.5/0.060”
PICO 14______________________0.5/0.020”
Cobra mk1___________________0.5/0.020”
Cobra 149/248______________1.5/0.060”
Clean the air filter and housing daily. A clogged filter
will cause excessive engine wear and carbonization
which clogs up exhaust ports and channels. Never use
themachine without theairfilter.Dustandstone particles
can enter the cylinder.
Check the impact mechanism oil level daily (on the
Cobra mk1). Place the machine in an upright position
and top up as necessary.

8
Safety first
For your own safety, always wear protective clothing
– glasses, gloves, shoes or boots with steel toecaps, ear
protectors and a hard hat.
For ease of operation use
your thigh as support when
running the machine.
Ear protectors Hard hat
Shoes or
boots with
steel toecaps
Glasses
Gloves

9
Both the Pionjär and the Cobra mk1 have handle designs
that shield the operator from a large proportion of harm-
ful vibrations and shock recoil.
On the Pionjär shock-absorbent rubber bushings reduce
vibration levels.
The Cobra mk1 incorpo-
rates H.A.P.S, (Hand and
Arm Protection System),
Atlas Copco’s unique anti
vibration design. The leaf
spring construction
virtually eliminates
vibrations.
Avoid running the engine close to flammable material
or in poorly ventilated areas.
Always empty the fuel tank before transportation and
storage.

10
A tool for every job
Always use the correct tool for the job - it saves time and
effort. Our motorized breakers and drills have tools for a
variety of applications.
Moilpoint Concrete
chisel
Wide chisel Wedge
Digging blade Asphalt cutter
Reinforced
asphalt
cutter Spade

11
Drill steels
Driver rod
Wedge hammer
Spike driver Tie-tamper
Tamper
Sheet
pile driver
Pipe driver
Driver pad
Posthole tool
Shaft
Wedge and
feathers

12
Cutting and
compacting asphalt
For this job you need the asphalt chisel and tamper.
Run the breaker at idling speed and make a score by hold-
ing the machine at an angle.
Break the asphalt, keeping the edge straight and angled
slightly inwards.

13
Compact the base thoroughly using the tamper.
When packing new asphalt start at the edges. This will
give a lasting seal. Compact the rest of the material and
level off.

14
Concrete breaking
Always start from the edge if possible when breaking
concrete. Use the widest tool the material will allow. It
makes the job go faster.
To make an opening in a concrete wall, drill some holes
around the outline of the hole and some additional holes
in the middle. Break out the material.

15
Tie tamping
The percussive effect provided by Atlas Copco breakers
ensures perfect compaction of the bearing ballast, with-
out risk of pulverization.
Start upright and work your way under the tie.

16
Drilling
Atlas Copco offers an extensive range of drills for differ-
ent materials and jobs. Avoid making a wider hole than
necessary. Choosing the correct drill saves both time
and energy.
Integral drill steels are the best choice for hard materials.
Thepilot drill is usefulfor an accurate startand for drilling
large diameter shallow holes.
Button bits are most suitable for drilling large holes in
concrete or soft rock.

17
When collaring a hole, grip the side handle for better con-
trol of the machine.
Allow the engine to idle and press the machine and tool
against the spot where you wish to drill. Increase the en-
gine speed once the drill bit has collared a footing in the
rock (or other material).
Regulate the feed pressure and rotation according to the
material you are working with. Never let the drill jump
freely on the shank.
Keep the drill centered so that it rotates freely in the hole.

18
If rotation becomes sluggish due to a crack, or the drill
keeps sticking, lift the machine a few times to improve
flushing.
If the tool gets stuck, stop the machine and free it with a
drill wrench or a spanner.
Drill dust in damp rock can cause the drill to stick. Pouring
more water into the hole dissolves the sludge and frees
the drill.

130° 110°
19
Integral drill steel are grouped in
series. When drilling a deep hole
start with a short, wide drill and
continue successively using the
next size down. This avoids jam-
ming and allows easy extraction.
To get maximum effect, tools should be kept sharp and
their shanks must have the correct lengths. This length
should be checked with the shank template.
On drilling tools, blow through the air-flushing channel to
check that it is not blocked.
The standard cutting edge angle is 110°. For better re-
sults in loose rock it can be reground to 130°.

20
Rock splitting
Using a motorized drill/breaker, you can split large rocks
safely and accurately.
Start by drilling holes in a straight line across the rock
you want to split. The holes should be about 30-40 cm
(12”-16”) apart and at least 40 cm (16”) deep.
Insert feathers and wedges along the line. Drive in each
wedge a little at a time until the rock splits. Some grease
applied to the wedges makes the job easier.