For Bmk 62S; Pusher Leg Feed Control Knob; Valve Pin; Start And Stop - Atlas Copco 72D Instrucciones De Seguridad Y De Funcionamiento

Safety and operating instructions
valve pin is depressed, the piston rod in the pusher
leg is retracted automatically.

For BMK 62S

Pusher leg feed control knob

V
Adjust the feed force using the feed control knob as
follows:
♦ Turn the knob anti-clockwise (B) to increase the
feed force.
♦ Turn the knob clockwise (A) to decrease the feed
force.
♦ When the feed control knob is in the closed
position (A), the pusher leg is vented.

Valve pin

When the valve pin (V) is pushed in, the feed force
ceases abruptly, thus overriding the setting on the
feed control knob. The facility is used, e.g. to adjust
the height of the rock drill, when rigging up the pusher
leg, or when there is a tendency to jam. When the
valve pin is depressed, the piston rod in the pusher
leg is retracted automatically.
16
ALF 72D, 72D-1, 67/80D, BMK 62S, BMK 91RS

Start and stop

Starting the rock drill

1. Open the main valve for compressed air.
2. Open the cock (D) for the flushing water.
3. Adjust the feed control knob (C) to give a suitable
feed force for collaring the hole.
4. Align the rock drill so that the drill steel touches
the required collaring point.
5. Move the throttle lever (A) forward a little, which will start the water flushing, the percussion and
rotation.
6. Collar the hole with reduced feed force.
7. Move the throttle lever (A) fully forward once the
drill steel has gained a secure footing in the rock.
8. Adjust the feed force by means of the control
knob (C) so that the maximum penetration rate
is obtained.
© 2012 Atlas Copco Construction Tools AB | No. 9800 0680 90c | 2012-07-04
A
B
C
D
Original instructions