Table 4-2. Troubleshooting
TEST OR INSPECTION
1. WELDING GUN WILL NOT FEED WIRE
Step 1. Check to see if motor is burned out.
If motor is burned out, refer to direct support maintenance.
Step 2. Check to see if inching switch is inoperative.
If inching switch is inoperative, refer to direct support maintenance.
Step 3. Check to see if wiring is faulty.
If wiring is faulty, refer to direct support maintenance.
Step 4. Check to see if swing arm assembly is inoperative.
If swing arm assembly is inoperative, check tension spring
and if broken, replace. Check drive roll
2. WELDING GUN SPATTERS; ERRATIC WELDS
Step 1. Check to see if gas jets in barrel are clogged.
If gas jets are clogged, remove barrel and clean jets thoroughly
Step 2. Check to see if nozzle is damaged.
3. WELDING GUN WILL NOT OPERATE.
Step 1. Check to see if control monitor circuit is damaged.
Check capacitors, resistor, and wiring for proper operation (para 4-19).
Step 2. Check to see if the power and/or range switches in the control
monitor are damaged or inoperative.
Step 3. Check to see if there is a broken wire in the handle assembly of the welding gun.
If there are any broken wires in the handle, refer to direct support maintenance.
Section V I.
RADIO INTERFERENCE SUPPRESSION
components have radio interference suppression
functions which are incidental or secondary to their
Essentially, suppression is attained by providing a
Replacement of Suppression Com-
The methods used include shielding the ignition
and high-frequency wires, grounding the frame
Refer to TM 5-3431-221-15 and replace defective
w i t h bonding straps, and using capacitors and
radio interference suppression components.
a. P r i m a r y S u p p r e s s i o n C o m p o n e n t s . T h e
primary suppression components are those whose
primary function is to suppress radio interference.
trial and error method of replacing components in
These components are described and located in TM
turn until the cause of interference is located and
b. Secondary Suppression Components. These
Section VIl. MAINTENANCE OF BODY AND HULL COMPONENTS
(3) Remove the twenty-six nuts (2, 7 and 12),
flatwashers (4, 9 and 14) and capscrews (4, 9 and
14). Remove the tool box floors (5, 10 and 15) and
remove the tool boxes (6, 11 and 16).
(2) Remove all the tools from the tool boxes.