TM 5-3431-200-15
(2) Inspect for corrosion, deterioration,
should indicate 100 ohms 5 percent resist-
and for worn or stripped threads on
ance; the inching speed resistor should indicate
mounting hardware. Replace dam-
25 ohms 5 percent; the contactor resistor
aged or defective material.
should show resistance of 200 ohms 5 per-
c. Testing.
cent. Replace a resistor that does not meet
(1) Use a standard capacitor tester. Touch
these requirements.
the tester probes to the capacitor
leads.
stall the inching feed, inching speed, and con.
(2) The rated capacitance of the trigger
tactor resistors,
switch relay capacitor and the inching
switch relay capacitor is 0.047 f at
60. Trigger Switch Relay Capacitor, Inching
600 working volts direct current.
Switch Relay Capacitor, and Rectifier
The r-edifier filter capacitor is rated
Filter Capacitor
0.1 f at 400 working volts, direct
current.
the trigger switch relay capacitor, inching
(3 Replace a capacitor that does not con-
switch relay capacitor, and the rectifier filter
form to the stated ratings.
capacitor.
b. Cleaning and Inspection.
stall the trigger switch relay capacitor, inching
(1) Clean the capacitors with a dry, lint-
switch relay capacitor, and the rectifier filter
free cloth.
capacitor.
Section VIII. WELDING GUN
(2) Refer to paragraph 49 and install the
61. Welding Gun Cover, Shield, Fitting
hose assembly.
Assembly, Swing Arm, and
Current Cable
a. Removal.
62. Nozzle, Adapter, Guide Tube, Gun Tube,
Gun Barrel, and Insulation
(1) Refer to paragraph 49 and remove
the hose assembly.
(2) Refer to figure 17 and remove the
the nozzle, adapter, guide `tube, gun tube, gun
cover, shield, fitting assembly, swing
barrel, and insulation.
arm, and current cable.
b. Cleaning, Inspection, and Repair.
b. Cleaning, Inspection, and Repair.
(1) Clean all parts with a dry, lint-free
(1) Clean the gun cover, shield, fitting
cloth. Clean the gun barrel gas ports
assembly, swing arm, and current ca-
after each 100 hours of use to remove
ble with a dry, lint-free cloth.
spatter or other obstructions.
(2) Inspect for cracks, breaks, broken in-
sulation, and worn or stripped threads
(2) Inspect for cracks, breaks, worn
on fittings and hardware. Repair or
threads, leaks, and signs of deteriora-
replace damaged or defective parts,
tion. Repair or replace damaged or
c. Installation.
defective parts.
(1) Refer to figure 17 and install the
cover, shield, fitting assembly, swing
stall the nozzle, adapter, guide tube, gun
arm, and current cable.
tube, gun barrel, and insulation.
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