(1) Disconnect ac power from the welding ma-
chine.
a. Removal. The double spark gap is located in the
(2) Open the timer and high frequency drawer.
timer and high frequency drawer, attached to the
(3) Loosen the lockscrew on each spark gap in the
underneath side of the insulated top panel. Proceed
spark gap assembly. These screws also hold the elec-
as follows to remove the spark gap assembly.
trical leads to the spark gap assembly.
(1) Disconnect ac power from the welding ma-
(4) Insert a ().008 inch feeler gage between spark
chine.
gap contact screws.
(2) Remove the timer and high frequency drawer
Note. If feeler gage is not available, close contact screws all
the way and open 1/2 or 5/8 turn. Emergency situations only shall
warrent adjustment without using a feeler gage. Readjustment,
gap assembly.
utilizing a feeler gage, shall be accomplished as soon as possible
b. Installation.
thereafter. Gaps exceeding 0.010 inch will emit excessive high fre-
gap assembly.
(5) Turn adjusting screw counterclockwise to in-
crease gap and clockwise to decrease gap.
(2) Install the timer and high frequency drawer
(6) Tighten lockscrew when a slight drag is felt
c. Adjustmemt. Proceed as follows to adjust the
as the gage is moved between the points.
spark gap. See figure 3-14.
(7) Close the timer and high frequency drawer.