Epiroc COP M6 User Manual

9
Service
How to break the driver chuck joint
The following method is commonly used for breaking the driver
chuck joint�
Using percussion
Run the hammer into the rock or a thick plank.
1) Apply light feed force.
2) Carefully start the impact mechanism of the
hammer.
3) Stop the impact mechanism as soon as the
driver chuck joint “cracks”.
4) Run the hammer up the feed beam to a
suitable working height, and unthread the
driver chuck and drill bit.
N�B� Beware of the weight of the drill bit. It
could be too heavy to hold.
Caution: When using gripper jaw or hydraulic break-out wrench
on drill rig, make sure jaws are in proper location. If not, this
could lead to premature damage on casing or bit.
Important:
Never use a sledge-hammer
on down-the-hole COP hammers.
Tools for removing the drill bit and
the backhead should revert to drill rig
specifications and tool accessories
Backhead and chuck removal can be serviced with a
hydraulic make/break-out bench
The threaded connections of the driver chuck and backhead can
become very tightly tensioned during drilling. There are special
tools for removing the bit and backhead from the casing of the
COP hammer, and these should be used whenever possible.
How to loosen the threads of the hammer
A
B
C
D
If special tools like chain wrenches or other types
of wrench are used to break the hammer joints,
then the tool must be attached around the
hammer casing at the highlighted areas (B and C)
in the figure to the right. Do not attach at other
points!
Failure to attach the wrench as illustrated may
result in damage to the casing. Any such damage
will not qualify for compensation.
Hammer
A
mm
(inch)
B
mm
(inch)
C
mm
(inch)
D
mm
(inch)
COP M6
114
(4,5)
55
(2,2)
126
(5,0)
170
(6,7)
COP M7
155
(6.1)
55
(2.2)
170
(6.7)
207
(8.1)
COP M8
115
(4.5)
290
(11.4)
150
(5.9)
320
(12.5)
Breakout bench
It is always most convenient to break the
hammer threads on the rig. For circum-
stances, when the threads cannot be
broken or tend to get stuck, there are two
types of breakout bench available.
Please contact Epiroc Drilling Tools for the Breakout bench part
number.
How to replace the drill bit
1) If you are about to disassemble the whole hammer, make sure
to mark the casing so you will know which end is the backhead
side and which is the driver chuck side. Once the hammer has
been disassembled it is hard to tell which end is which.
2) When the chuck threads have been loosened, remove the driver
chuck from the casing along with the drill bit and retaining rings.

Epiroc COP M6 Specifications

General

Brand	Epiroc
Model	COP M6
Category	Construction Equipment
Language	English