ASG BTL-20 Instruction Manual Download Page 2

Instruction of Parts

BTL-20 and BTL-30 Starting Mode/RPM Adjustment

Operating Instructions

1.  When working with torque larger than 2 N.m (17.7 lbf.in), 

please adjust RPM to less than 650 for safety purposes.

2.  Make sure the power is switched off to install or replace 

the screwdriver bit.  Pressing the front-end iron cap will 
allow the screwdriver bit to be inserted or released.

3.  It is recommended to suspend the electric screwdriver from 

a balancer for easy operation.

4.  Adjust the torque dial to the proper position according to 

the dial/torque table for each model.

5.  Press the 

Forward

 switch to fasten the screw.  The automatic 

control model will shut off the power and stop the rotation of 
the screwdriver bit as soon as the set torque value is reached.

6.  Press the 

Reverse

 switch to loosen the screw.

7.  Hold and keep the screwdriver and screw in a 

perpendicular position with the work surface and apply 
pressure slightly to prevent slipping.

8.  Operate the electrical power screwdriver safely.
9.  Do not press the 

Forward/Reverse

 switch at the same time 

to prevent the short-circuit of the switch.

10.  Use it under the normal operation frequency (8 working 

hours per day and fastening 800-1000 screws per hour) 
without exceeding the operation load will extend the life 
time of the electric screwdriver and reduce the occurrences 
of malfunction.

11.  Please do not fasten wood screws.

Regular Maintenances 

Check whether all the parts, housing, and power lines are in-tact 
at all times to ensure normal operations.  Unplug the power plug 
and turn off the power before doing any maintenance operation 
to ensure safety.  Provide preventative maintenance for every 
1000 hours of operation.  Contact the ASG Service Department. 

CAUTION: 

•  This electric screwdriver is designed for indoor use only. 

Please do not use it in outdoors or wet environment to 
prevent the danger of electrocution.

•  Pay attention to the voltage specification. Make sure the 

switch is in the OFF position when you plug in the power.

•  Do not disassemble the device. 

Output Torque/Adjust Dial

1.  User can adjust output torque by changing the torque spring. 

Please refer to the torque/dial table and then turn the torque 
adjusting nut to set the proper dial for each model and set to 
the desired torque for operations. 

ASG BTL-20 and BTL-30 Torque Adjusting

•  Please refer to the Output Torque/Adjust Dial table above to 

adjust the working torque output.

•  The torque scale is relative but not absolute.
•  To ensure the absolute correct torque output, please 

periodically use a torque tester to check and confirm the 
torque output of the screwdrivers.  ASG recommends the 
ASG DTT Series digital torque testers.

Starting Mode Adjusting: 
The starting mode adjusting 
switch is in the middle of the 
metal name plate
Turn to LEVER for Lever Start
Turn to PUSH for Push-to-Start

RPM Adjusting: The RPM Adjusting Knob 
is at the bottom of the metal name plate
Adjust the RPM by small flat blade 
screwdriver
Rotate clockwise for higher RPM 
Rotate counter-clockwise for lower RPM

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