Overview; Design And Function; Main Parts - Atlas Copco 72D Instrucciones De Seguridad Y De Funcionamiento

Safety and operating instructions

Overview

To reduce the risk of serious injury or death to
yourself or others, read the Safety instructions
section found on the previous pages of this
manual before operating the machine.

Design and function

Pusher legs of type ALF 72D, ALF 72D-1, BMK 62S,
ALF 67/80D and BMK 91RS are used with light rock
drills of type BBD and RH. ALF 72D, ALF 72D-1 and
ALF 67/80D are used together with BBD 94W and
are double-acting with an automatic return. BMK 62S
is used together with RH 656W and needs to be
retracted manually.
ALF 72D, ALF 72D-1, BMK 62S and ALF 67/80D are
equipped with a one-stage cylinder. ALF 67/80D is
equipped with a two-stage cylinder. BMK 91RS is
used together with BBD 94W and is equipped with
a one-stage cylinder with an automatic return.
Cylinders are made of aluminium except for BMK
62S and BMK 91RS which are made of steel. The
pusher legs are connected to the rock drill by a
special attachment device. Recommended air
pressure is 6 bar (87 psi).
The pusher leg support is for helping the operator to
lift and feed the rock drill during drilling operations.
No other use is permitted.
Working principle of a pusher leg
The feed movement of the pusher leg is powered by
compressed air, which is directed to the lower side
of the piston and pushes the piston out of the
cylinder. For automatic return (not BMK 62S) of the
piston rod into the cylinder, compressed air is
directed to the upper side of the piston.
12
ALF 72D, 72D-1, 67/80D, BMK 62S, BMK 91RS

Main parts

E
D
F
G
ALF 72D
ALF 72D-1
Feed control knob
A.
B. Valve pin
Hose nipple 12.5 mm (0.49 in.)
C.
Feed cylinder
D.
E. Piston rod
Handle
F.
Spike with support
G.
H. Warning label
© 2012 Atlas Copco Construction Tools AB | No. 9800 0680 90c | 2012-07-04
B
A
E
C
H
F
G
BMK 62S
Original instructions
B
A
C
D