Atlas Copco RRD37 Serie Instructions Produit page 8

Safety and operating instructions EN RRD37/57
Handling
Fitting the chisel
Insert the chisel so that chisel retainer (33) snaps into the chisel groove.Check
that the chisel retainer spring is tensioned.
Removing the chisel
Lift the rear end of the chisel retainer (33) and pull the chisel out.
Using the hand guard
The hand guard (41) supplied as an accessory for vibrationdamping has a snap
lock for attachment to the front housing (30).
If it is necessary to guide long chisels near the chisel blade, detach the collet
from the machine with a light jerk and move it down over the chisel.
Attach the collet to the machine before changing chisels.
Avoid holding the chisel directly.
Vibration damping
Vibration damping is accomplished by means of two air springs, one in the im-
pact mechanism between the piston (23) and thecylinder (22) and one behind
the chisel collet ring (28). This latter spring dampens the shock wave reflex
from the chisel. The necessary feed force is determined by the air pressure to
the machine. When the throttle valve is pressed only part of the way in, a lower
speed force is thus required.
For complete vibration damping between the machine housing (2) and the im-
pact mechanism: Use sufficient feed force so that the chisel collet ring (28) is
pressed up a few millimeters from the buffer (29), i.e. the chisel is pressed in a
corresponing amount into the front housing.
If the feed force is too high, the chisel collet ring (28) will butt against the
cylinder (22), whereupon vibrations increase noticeably and the impact effect is
reduced.
Idling
When idling, the machine output is appreciably reduced in that automatic vent-
ing occurs via the collet (25). The idling strokes are absorbed by an elastic buf-
fer (29). When switching from work to idling, a few individual hard idling
strokes may be absorbed via the buffer.
Avoid unnecessary idling
When the buffer (29) is worn, the chipping hammer may stop while operating
and/or be difficult to start. If this occurs, replace the buffer immediately in or-
der to prevent harmful blows directly on the front housing (31).
Maintenance
Overhaul
If the chipping hammer is in daily use, it should be cleaned and overhauled
once every sixth month.
Removal of front housing with chisel retainer and buffer:
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