Data
Cobra 148.....................................Combined rock drill and
breaker
Cobra 149.....................................Combined rock drill and
breaker
Cobra 248.....................................Breaker only
Cobra 249.....................................Breaker only
Engine
Type..............................................1 cylinder, two-stroke, air
cooled
Cylinder displacement ..................185 cc
Speed, crankshaft (strokes/min) ......Full speed: 2550–2650 rev/min
Idling: 1600–1800 rev/min
Carburettor ...................................Diaphragm type (Tillotson)
Ignition system..............................Thyristor type, breakerless
Spark plug (recommended)..........Motorcraft AE-6, BoschW7AC
Spark plug gap .............................1.5 mm (0.06 in.)
Starter...........................................Magnapull
Fuel type.......................................Petrol, 90–100 octane,leaded
or unleaded
Oil type .........................................Atlas Copco two-stroke oil ora
recommended two-stroke oil
Fuel mixture..................................5% (1:20)
Tank capacity................................1.5 litres (0.39 US gallons)
Fuel consumption .........................Approx. 1.1–1.4 litres/hour
(0.29 - 0.37 US gallons)
Capacities, Cobra 148, Cobra 149
Max. drilling depth ........................6 m
Penetr. rate with 29 mm drill bit ....300–350 mm/min
(11.8 - 13.8 in./min.)
Penetr. rate with 34 mm drill bit ....250–300 mm/min
(9.8 - 11.8 in./min.)
Penetr. rate with 40 mm drill bit ....150–200 mm/min
(5.9 - 7.9 in./min.)
Other data
Tool shank ....................................22x108 mm (7/8" x 4 1/4")
Weight, Cobra 148, Cobra 149.....25 kg (53 lbs)
Weight, Cobra 248, Cobra 249.....22 kg (51 lbs)
Length, Cobra 148, Cobra 149.....745 mm (29.3")
Length, Cobra 248, Cobra 249.....715 mm (28.1")
Width, max....................................470 mm (18.5")
Connection of grinding machine—see separate in-
structions
.
Declaration of noise and vibration emission
Cobra models 148 149 248 249
Noise according to PN8NTC2
Measured sound
pressure level
p dB(A) 99 99 98 98
Spread in method and
production
k
p
dB(A)
4.0 4.0 4.0 4.0
Measured sound
power level
w dB(A) 113 113 112 112
Spread in method and
production
k
w
dB(A)
4.0 4.0 4.0 4.0
Vibration according to EN28662
Measured vibration
value
a m/s
2
8.0 8.5 8.0 8.5
Spread in method and
production
k
a
m/s
2
4.7 4.9 4.7 4.9
Main parts
Illustration shows Cobra 149 (fig. 2A)
A. Choke
B. Throttle lever (Cobra 149, Cobra 249)
C. Vibration-dampened handle
4
English
Safety regulations
These instructions contain important sections dealing with safety.
Special attention must be paid to all framed safety text that begins with a warning symbol (triangle) followed by
a signal word, as shown below.
denotes a hazard or hazardous procedure which CAN lead to serious or
life-threatening injuries if the warning is not observed.
denotes a risk or risky procedure which CAN lead to personal injury or
damage to equipment if the warning is not observed.
Also observe the following general safety rules:
! WARNING
! CAUTION
q
Before starting the machine, read through
these instructions carefully.
q
Also read through the red safety instruc-
tions before putting the machine to use.
q
For reasons of product safety, the machine
must not be modified.
q
Use approved personal protective equipment.
q
Use Atlas Copco Genuine Parts only.
q
Always replace worn or damaged signs. The
ordering numbers for signs can be found in
the spare parts list (fig. 1).
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