MAINTENANCE | ||
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Periodically remove and clean the nozzle, contact tip and gas diffuser. Replace the nozzle insulator if dam- aged. Regular use of an
Clean cable liner after using approximately 300 pounds (136 kg) of electrode. Remove the cable from the wire feeder and lay it out straight on the floor. Remove the contact tip from the gun. Using an air hose and only partial pressure, gently blow out the cable liner from the gas diffuser end.
CAUTION
Excessive pressure at the start may cause the dirt to form a plug.
Flex the cable over its entire length and again blow out the cable. Repeat this procedure until no further dirt comes out.
Gun Tube Replaceable Parts
a.The gun tube insulation disk should be periodi- cally examined for wear. To replace the gun tube insulation disk, remove the diffuser and pull off the gun tube insulation disk. Although the gun tube insulation disk does not have a thread, it can be unscrewed from the gun tube. Refer to Figure E.1.
b.The nozzle holder can be replaced if the threads are damaged. Remove the diffuser and gun tube insulation disk (refer to a. and Figure E.1). Remove the two (2) set screws that lock the nozzle holder in place. Unscrew the nozzle holder. (Note: The nozzle holder has a Left hand thread.) Pull the nozzle holder off the gun tube assembly. Be careful to not drop the ceramic that may come off with the nozzle hold- er. Coat the inside diameter and the outside diameter of the ceramic with DOW CORNING 340 joint compound (Lincoln part T12837). Check that the insulation ring is in place and place the ceramic on the gun tube. Place the new nozzle holder over the ceramic and tighten in place. Replace the two (2) set screws. Replace the gun tube insulation disk and the dif- fuser.
GUN TUBE ASSEMBLY
M4 X 0.7 THREAD |
INSULATION RING |
NOZZLE HOLDER |
CERAMIC INSULATOR |
GUN TUBE INSULATION DISK |
DIFFUSER |
THREAD SIZES FOR MAGNUM 450WC & 650WC CONSUMABLES
M4 X 0.7 THREAD
M20 X 1.5 INTERNAL LEFT HAND THREAD
FOR 450WC & M24 X 1.5 LEFT HAND THREAD FOR 650WC
SPECIAL THREAD
M11 X 1 FOR 450WC &
M12 X 1 FOR 650WC
M8 X 1.25
Figure E.1 | Figure E.2 |
MAGNUM® 450WC & 650WC
