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ASb 53-2
To be handed to the workshop!
Operating instruction
for the Impact Wrench type ASb 53-2 (D.C. and A. C.
single phase) and ASb 53-2K (42 Volts)
Technical data
Type of
current:
~ ;,....,
(D.C. and A.C. single phase)
For screws
Square
Sp
eed
R.P.M.
Taps
Input
I
Out-
Net
w eight
Ty
pe
standard
I
high
tensile
driv
e
full
I
no
p.
M
.
put
up t
o
up t
o
ASb 53-2
M 22 (1/s")
M 18 (
3
/
4'')
ASb 53-2 K (42 Volts)
1. Construction
The
t ool is driven by
a
r
obust,
fan- cooled AC/DC motor
m
ounted
in an extra-rigid light alloy housing. The comp act planetary
reduction gearing is robust and silent in
operation.
The well-
balanced percussion mechanism is totally enclosed in the tool-
head casing and is easily
removed.
The tool h older complies
w
ith international standards and h
a
s a
3 /
4" (19 mm) square drive.
2. Reversing the drive
is don
e by
m ean
s
of
the
reversing
ring (1 4) m ounted on
the
motor housing. Turn reversing ring only when tool is switched
off,
otherwise
commutator and windings will be damaged.
3. Mode of operation
The
m
otor drives the
tool
holde
r
w
ith tool
a
ttach
e
d via
gearing
,
d
rive
spindle
and p
ercussion
m ech anism.
The direct drive
of
approx
.
1,100 r.p .m
. is cut o
ut
as soon as
the
screw or
nut h
as
b een roughly run down. Once the motor reaches its rated
loa
d,
the percussion m echanism comes into operation and converts
the
drive force
of the motor - which continues to run at uniform
speed
- into
an intermittent
torque
applied at the
rate
of 1,500
r.p.m.,
i.e. tw
o
strokes fo
r
each
revolution of
the d rive spindle.
Scr
ews
and nuts
are
slacken
e
d in
reverse order: first
p ercu ssion
strokes
, followed b
y direct d
rive.
The
t ool
is
very
easy
t
o
h
andle
, as
the ope
r ator n
e
eds not exert any r est
r
aining to
r que.
As the clutch
w
ill always
disengage
as soon as the rated load
is attained,
the
m
o
tor cannot be
overloade d.
4. Application
The
full
tightening
or
slackening action
prov
ided depends on
the time
during which
the
p ercussion mechanism is allowed to
run.
Max. tigh tening
torqu
e
i
s the
sum of th
e torque
applied
by
each stroke. According to the type of screwed connection the
max. torque will generally represent between 80 and 150 single
torque
strokes,
which ar
e applie
d in 3 to 5
seconds
.
Availa ble
m
ax.
t
o
r qu
e
in normal ser
v ice
is 185 lbs. ft. (26 kpm)
(see
dia-
g
r amm p
.
4)
.
Th
ere is
n
o p oin
t in
apply
ing the
tool
for
longer
tha
n
5
seconds
since
th
e
torque w
ill
not
increase
any
further,
w
hile
t
he
tool
BE
176/
e
BX
11.
64
Printed
in
Germany
in.
3f,,
load
lo ad
in
Watts
lbs
I
k
g
-
-
I
I
I
750
1400
I
1500
I
480
280
I
11.1
5.0
I
I
I
head will appreciably heat. O verheating
w
ill
lead
to
incre
ased
wear of
all
p er cu ssion comp onents an
d excessive
lubricant con-
sumption
.
M or
eover,
su
ch overheating
w
ill
make
the
tool
too
hot to
handle.
It
is not
adv
isable t
o
u
se
at
tachments
exceedin
g 4.5 lbs
in
w eight
,
since
tq
e t eel
holder
seat ing is not designed for
such
loads.
I
Use
U
n iv ersa
l
Gre~se
typ
13
Sst
1
!
lns•
..,a
o r;
f
o~
""r
t'/.C:: '
-·.f
,•
r
,
5
1
5. Maintenance
and·
lubrication
··
-
8
T his w
ill dep end on th
e
duty
.
The follow
ing instructions
are
for cont inuous use in 8-hour day with actual
t
ool running time
representing 20°/o of total duty
period.
Th
e t
ool holde
r
(78)
should be lubricated
every
other day
by
mean
s
of the oiler (81
)
at the h ead (79).
Use
mach ine
oil or
thin-flow
ing
grease.
The
p
e rcussion
mech anism shou ld be
completely
cle aned of
old
gr ea
se
at least
every 300 hours
(app
r
ox
.
6 weeks)
. For
this pur
-
p
ose
r
emove
the
three
scr
ews (82),
then
take off
th
e o
uter
bear-
ing (79) and li.ft th
e
p ercussion m ech
anism
out
of th
e
inter-
mediat
e bearing without taking it apart.
Then apply grease
liberally to
th
e
impact fac es
of
parts (76)
and
(78) (30
to
40 g or about 1 to
P
/2
oz.). Ball
pivots
and
plane
tary
ge arings
should also be gre ased
w
ith FK
3.
FK
3 is
a
high-grade
q
u
ality
grease
and is
suitable
fo
r all p er cu ssion m ech
anism
parts
b ecause of its good h eat r
e
sistan
ce and
adher en ce. Ball
b ear ing
g
r
ease
p
ackings
sh ould also b
e
replen ished with
FK
3.
Should th
e
percussion m
e
chanism jam or run
irre gularly
in spite
of
ade quate
lubrication and
regula
r maintenan
ce,
th
e combined
driv
e assembly should be taken out as
described
under para-
gra
ph 7,
a
nd
the indiv
idual parts should b
e
t
ested.
Fre quently,
however, uneven
running
is
cau
sed by
wear,
i.e.
impact
dogs
w
h
ich
h
ave
b ecom
e
radiused
, o
r rel axation
of
spring
(75).
so
t
h
a
t sp
ring
p ressu
re
weaken
s.
W orn
dogs can
be
regroun
d
.
Max.
tightening or slackening torque can
only
be obtained
w
ith a
tool a pplying uniform
st
rok
es along the
axis.
Carbon brushes (17)
should b
e ch ecked
at intervals
of
abo
ut
6
w
eeks
an
d
r eplaced if appr
eciably
worn
down (w
h en comple-
te
ly
worn
down
t
h
ey w
ill
be
7 mm
[1/4"]
long). In order to
re-
p
lace
th
em
t ak
e off carbo
n h
older caps
(1
6)
.
Replace
brush
es in
time t
o avoid
damage to
the
commutator.
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