Flows of gas and water are routed through the Feeder
The circuits of the Feeder are part of the circuitry of
by the operation of a gas solenoid, a water solenoid,
the Control and gun, and include: a motor, a wire feed
a n d a water pressure switch (Fig. 14). The gas
speed potentiometer in the motor control circuit, a
solenoid admits shielding gas from the gas source to
g a s solenoid, a water-solenoid, a water pressure
the gun nozzle. The water solenoid admits cooling
switch, and a brake solenoid, For details on the
water from a source to the gun (water-cooled) and to
functioning of these circuits, refer to the control
the current relay in the control. These services are
manual.
provided upon closing the trigger switch and a short
time after the trigger switch is released. A time delay
The operating sequence of the Feeder components is
relay within the control provides for setting the post
listed in Figure 11.
flow time.
The water pressure switch is factory-set to close at a
water pressure of 25 psi. It keeps the system in-
operative unless inlet water pressure is at least 25 psi
Section IV. MAINTENANCE
4.1 GENERAL
CAUTION
This section covers inspection, preventive mainten-
ance and service, and repairs required to keep the
BEFORE MAKING REPAIRS TO THE
Feeder operating efficiently,
F E E D E R MAKE SURE POWER
SWITCH AT CONTROLS IS OFF.
4.2 PREVENTIVE MAINTENANCE
Preventive maintenance consists of cleaning, tight-
At least every 30 days check the Feeder as follows:
ening, and making minor repairs designed to prevent
lay-up time of equipment for major service and parts
a. Look for signs of overheating of wires and
replacement.
components.
Figure 15. Timing Belt Adjustment
