Power Input Cables; Welding Guns - Lincoln LN-742 Service Manual

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K320 FLUX TANK
Either turn off the incoming air line or remove the quick
disconnect if one has been installed. Slightly loosen the
tank cap and let the air in the tank escape in the holes
in the side of the cap. After pressure has been
released, remove the cap from the tank. Using the
funnel provided, put 100 pounds of flux in the tank. It is
very important that only new or properly reclaimed flux
be put in the tank. Coarse particles and/or magnetic
particles will stop the flux feeding process. New Lincoln
flux is properly screened at the factory. All reclaimed
flux must be separately screened through a vibrating
screen with 0.065 in. to 0.075 in. openings and be put
through a magnetic separator. The K310 vibrated
screen and K58 magnetic separator are available for
this purpose. The screen in the funnel supplied with the
tank has much larger openings and its only purpose is
to keep paper and slag out of the tank.
There will always be a small amount of air and possible
drops of water coming out of the end of the tube coiled
under the tank. This is an automatic disposal system in
case the plant air has water and dirt in it.

POWER INPUT CABLES

A variety of power input cable assemblies are available
for various current ratings and power source connec-
tion types. All provide a polarized control cable plug
and a lugged electrode cable for connection to the wire
feeder.
K591 INPUT CABLE
Consists of an eight-conductor control cable with 14-
pin control cable plug and a 2/0 (67 mm
cable with Twist-Mate connector. It is rated at 400
TM
amps, 60% duty cycle, and is available in lengths of 10,
,
25 and 50 feet (3.0, 7.6, and 15.2 m).
K592 INPUT CABLE
Consists of an eight-conductor control cable with 14-
pin control cable plug and a 3/0 (85 mm
cable with stud terminals. It is rated at 600 amps, 60%
duty cycle, and is available in lengths of 10, 25, and 50
feet (3.0, 7.6, and 15.2 m).
ACCESSORIES
K593-10 INPUT CABLE AND
GAS HOSE
Similar to the K591, but includes a gas hose with a 5/8-
18 male fitting for the LN-742 inlet, and water hoses
with 5/8-18 left-hand male fittings to connect between
the water cooler and an LN-742 equipped with the
optional K590-1 water solenoid kit. It is rated at 400
amps, 60% duty cycle, and is available in a 10 ft (3.0
m) length.
K619 INPUT CABLE
Consists of an eight-conductor control cable with 14-
pin control cable plug and a 1/0 (53 mm
cable with stud terminals. It is rated at 350 amps, 60%
duty cycle, and is available in lengths of 10, 25, and 50
feet (3.0, 7.6, and 15.2 m).

WELDING GUNS

Welding guns can be broken down into groups,
according to the type of welding that is to be
accomplished. Select the appropriate welding gun from
the following weld-type groups.
INNERSHIELD GUNS
K122. This submerged arc gun and its cable assem-
blies are rated 500 amps, 60% duty cycle.
K115. This Innershield gun and its cable assemblies
are rated at 450 amps, 60% duty cycle. Maximum wire
size for LN-742 models is 5/64 in. (2.0 mm).
K126. This Innershield gun and its cable assemblies
) electrode
2
are rated at 350 amps, 60% duty cycle. Maximum wire
size for LN-742 models is 5/64 in. (2.0 mm).
NOTE: The K115 and K126 are not recommended for
LN-742H models.
NOTE: Linconditioner
locations where smoke accumulation is a problem and
) electrode
2
conventional exhaust systems are ineffective. The
available smoke removal type Innershield guns and
vacuum units can be used in these locations.
Instructions are shipped with the equipment.
LN-742 & LN-742H
) electrode
2
guns are recommended for
TM
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