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FAST MATE GUNS SERIES
MAINTENANCE
REMOVAL, INSTALLATION AND TRIMMING
INSTRUCTIONS FOR LINERS
See Figure D.1, D.2 and D.3
NOTICE: The variation in cable lengths prevents the interchange-
ability of liners. Once a liner has been cut for a particular gun, it
should not be installed in another gun, unless it can meet the liner
cut off length requirement. Liners are shipped with the jacket of
the liner extended the proper amount.
a. Remove the gas nozzle and nozzle insulator. Loosen the set
screw located in the side of the diffuser with 5/64" (2.0 mm)
Allen wrench (provided with the gun).
b. Remove the gas diffuser from gun.
c. Lay gun and cable out straight on a flat surface. Remove the
liner nut from the connector end of the cable and pull liner out
of cable.
d. Insert a new untrimmed liner into the connector end of the
cable. Be certain that the liner busing is stenciled appro-
priately for the wire size being used.
e. Fully seat the liner bushing into the connector. Finger tighten
the liner nut onto the cable connector.
f. With the cable straight, trim liner to 1-1/4" (31.8 mm).
Remove any burrs from the end of the liner.
g. Screw the gas diffuser onto the end of the gun tube and
securely tighten.
h. Tighten the set screw in the side of the gas diffuser against
the cable liner using a 5/64" (2.0 mm) Allen wrench.
WARNING
This screw should be gently tightened. Over- tightening will
split or collapse the liner and cause poor wire feeding.
GUN TUBES AND NOZZLES
a. Replace worn contact tips as required.
b. Remove spatter from inside of gas nozzle and from tip after
each 10 minutes of arc time or as required.
c. To remove gun tube from gun, loosen socket-head clamping
screw in handle with 3/16" (4.8 mm) Allen wrench. Remove
gas nozzle and nozzle insulator and also loosen small set
screw in the diffuser using 5/64" (2.0 mm) Allen wrench.
NOTE: Small set screw in the diffuser must be loosened,
otherwise liner could be damaged when attempting to
remove gun tube.
Pull gun tube out from gun handle. To reinstall, insert the gun
tube, push in as far as possible, and retighten screws.
ROTATING THE GUN TUBE
The gun tube can be rotated to any position desired by the
operator. Loosen the front insert molded guntube piece, rotate the
gun tube to the desired position and retighten the nut with hands.
CONTACT TIP AND GAS NOZZLE INSTALLATION
ON HDE
a. Choose the correct size contact tip for the electrode being
used (wire size is stenciled on the side of the contact tip) and
screw it snugly into the gas diffuser.
b. Be sure the nozzle insulator is fully screwed onto the gun tube
and does not block the gas holes in the diffuser.
c. Slip the appropriate gas nozzle onto the nozzle insulator.
Adjustable gas nozzles are available with a .62" (15.9 mm) or
.50" (12.7 mm) I.D., and in both standa and recessed design.
The proper nozzle should be selected based on the welding
application. Different nozzles are also available to allow either
spray or shortcircuit transfer welding. Choose the gas nozzle.
For the Outershield (FCAW) process 1/8" (3 mm) recess is
recommended.
D-1
MAINTENANCE
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