© 2016 Nelson Stud Welding, Inc. Page 25
All Rights Reserved. January 2016 Part No. 729-110-043 Rev. 1.02
8.3 Electrical Functions of Guns
8.3.1 Triggering Contact
The trigger switch is checked for proper functioning by connecting a continuity tester or ohmmeter
at pin 3 of the control plug and to the foot plate.
If the switch provides a proper contact, the continuity tester will emit a signal or the ohmmeter will
show 0 ohms.
8.4 Gun Coding
A jumper between pins 1 and 6 tells the power unit that a set lift gun is connected. An ohmmeter
will show 0 ohms.
8.4.1 Dismantling & Reassembling Welding Guns
1 Loosen set screws in the front cover 3 and rear cap 4.
2 Remove the caps and lay the gun on its right side.
3 Remove 3 screws that hold the gun halves together.
4 Separate and remove the left gun body such that the internal
components remain in the right half.
5 Inspect parts for damage or excessive wear and replace if necessary.
6 Reassemble in reverse order; making sure that the radial
orientation of the holding coil assembly 8 is such that where
the leads emerge from the coil is adjacent to the slot in the
right gun body so the leads can be neatly run into the gun
handle. The spring adjusting nut 5 should be oriented such
that the radial screw fits in the keyway in the gun body and
the spring tension gage line is toward the top of the gun.
7 Reassemble the rear cap with the slot towards the top of
the gun and the front cover with its bottom perpendicular to
the gun handle.
Safety Bypass
(Spring to Front Cover)
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