GUR 12 • GUR 12S
8
EN
Always check torque with a torque wrench, as the
fastening torque is affected by many factors including
the following:
Voltage:
Low voltage, due to a nearly
discharged battery, will reduce
the fastening torque.
Bit or socket size:
Failure to use the correct bit or
socket size will cause a reduction
in fastening torque.
Variable speed
trigger switch:
Operating the tool at a reduced
speed will decrease the fastening
torque.
Bolt size:
Larger bolt diameters generally
require higher fastening torque.
Fastening torque will also vary
according to length, grade, and
torque coefficient.
Material:
The type of material and surface
finish of the material will affect
fastening torque.
Fastening time:
Longer fastening time results
in increased fastening torque.
Using a longer fastening time
than recommended could cause
the screws to be overstressed,
stripped or damaged.
Reference values for the proper fastening torque, based
on a standard bolt and resist high tension bolt are provided
here.
Fig. 7: Standard Bolt - Tightening Torque Allowed
M, [kgf/mm] – Tightening Torque
t, [sec] – Tightening Time
Fig. 8: Resist Hight Tensile -
Tightening Torque Allowed
M, [kgf/mm] – Tightening Torque
t, [sec] – Tightening Time
WaRning:
Metal case can get hot during
continuous operation.
1. Cautions on use of the speed control switch.
This switch has a built-in electronic circuit that can
vary the rotation speed. Consequently, when the
switch trigger is pressed only slightly (low speed rota
-
tion) and the motor is stopped while continuously driv
-
ing in screws, the components of the electronic circuit
parts may overheat and be damaged.
2. Tightening torque.
Refer to
Fig. 7 & 8
, please use this example as a gen-
eral reference as tightening torque will vary according
to tightening conditions.
WaRning:
Over tightening can result in the
screw breaking or damage to the end of the driver bit.
If a long striking time is used, screws will be strongly
tightened. This may cause the screw to break, or may
damage the end of the bit.
If the machine is held at an angle to the screw being
tightened, the head of the screw may be damaged, or
the specified torque may not be transmitted to the screw.
Always keep the machine and the screw being tightened
in a straight line.
IX - Maintenance
cleaning
▪ With the motor running, blow dirt and dust out of all air
vents with dry air at least once a week. Wear safety
glasses while performing this.
▪ Exterior plastic parts may be cleaned with a damp
cloth and mild detergent.
WaRning:
Although exterior plastic parts
are highly solvent resistant, NEVER use solvents.
charger cleaning instructions
▪ Dirt and grease may be removed from the exterior of
the charger using a cloth or soft non-metallic brush.
Do not use water or any cleaning solutions.
WaRning:
Disconnect the charger from the
AC outlet before cleaning.
WaRning:
To assure product safety and
reliability, repairs, maintenance and adjustment (in
-
cluding brush inspection and replacement) should be
performed by certified service centres or other quali-
fied service organisations, always using identical re-
placement parts.
accESSORiES
Recommended accessories for use with your tool are
available at extra cost from your local SPARKY service
centre.
