Working Advice - grupostayer IW 550 Manual De Instrucciones

The impact mechanism is activated as soon as the
screwed connection runs tight and thus load is put
on the motor. In this instance, the impact mechanism
converts the power of the motor to steady rotary
impacts. When loosening screws or nuts, the process
is reversed.
Overloading the motor is not possible, as the hammer
mechanism disengages when reaching the rated load.
Starting Operation
Observe correct mains voltage! The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine. Power
tools marked with 230 V can also be operated with
220 V.
Reversing the rotational direction (see figure A)
The rotational direction switch 7 is used to reverse the
rotational direction of the machine. However, this is not
possible with the On/Off switch 5 actuated.
– Right rotation:
Press the rotational direction switch 7 rightward to
the stop.
– Left rotation:
Press the rotational direction switch 7 leftward to the
stop.
Switching On and Off
– To start the machine, press the On/Off switch 5 and
keep it pressed.
– To switch off the machine, release the On/Off
switch 5. To save energy, only switch the power tool
on when using it.

WORKING ADVICE

Before any work on the machine itself, pull the
mains plug.
Apply the power tool to the screw/nut only when
it is switched off. Rotating tool inserts can slip off.
The torque depends on the impact duration. The maxi-
mum achieved torque results from the sum of all indivi-
dual torques achieved through impact. The maximum
torque is achieved after an impact duration of 3–5
seconds. After this duration, the tightening torque is
increased only minimally.
However, the transmission
noticeably.
Note: The consequences of excessive heating-up are
high wear of all hammer mechanism components and
a high requirement of lubricant.
The impact duration is to be determined for each
required tightening torque. The actually achieved
tightening torque is always to be checked with a torque
wrench.
Screw Applications with Hard, Spring-loaded or
Soft Seat
When in a test, the achieved torques in an impact
series are measured and transferred into a diagram,
resulting in the curve of a torque characteristic. The
height of the curve corresponds with the maximum
reachable torque, and the steepness indicates the
duration in which this is achieved.
A torque gradient depends on the following factors:
– Strength properties of the screws/nuts
– Type of backing (washer, disc spring, seal)
– Strength properties of the material being screwed/
bolted together
– Lubrication conditions at the screw/bolt connection
The following application cases result accordingly:
– A hard seat is given for metal-to-metal screw
applications with the use of washers. After a relatively
short impact duration, the maximum torque is reached
(steep characteristic curve). Unnecessary long impact
duration only causes damage to the machine.
– A spring-loaded seat is given for metal-to-metal
screw applications, however with the use of spring
washers, disc springs, studs or screws/nuts with coni-
cal seat as well as when using extensions.
– A soft seat is given for screw applications, e. g.,
metal on wood or when using lead washers or fibre
washers as backing.
For a spring-loaded seat as well as for a soft seat, the
maximum tightening torque is lower than for a hard
seat. Also, a clearly longer impact duration is required.
Tips
Torque rods have shanks with precisely calibrated,
reduced diameters. Thus, they act torque-limiting. A
torque rod is placed between the impact wrench and
the bit.
Rule of thumb for the application: Core diameter of the
screw/bolt = effective diameter of the torque rod. The
impact duration is to be determined through practical
testing.
The thumbwheel 6 must be set to max.
For hanging up, a suspension hook 3 is mounted at
the machine's centre of gravity.
At temperatures below the freezing point, run the ma-
housing heats up
chine for approx. 3 minutes at no-load to improve its
lubricating capacity.
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