50
Insulated idler roll
25 Gas nozzle
51
Preformed packing
26 Adaptor
52
Bearing arm bolt
27 Insulating washer
1
Welding set
28 Insulating washer
53
Spring
2
Welding gun
54
Bearing arm
29 Machine screw
3
Reel cover bolt
53
Bracket and fitting assembly
4
Preformed packing
30 Gun barrel housing
56
Fitting assembly
5
Reel cover
31 Gun barrel insulation
57
Machine screw
32 Insulation
6
Machine screw
58
Machine screw
33 Gun barrel assembly
7
Reel shaft
34 Insulating washer
59
Machine screw
8
Flatwasher
60
Trigger assembly
35 Front guide bushing
9
Thread cutting tapping screw
61
Setscrew
36 Setscrew
10
Lockwasher
37 Retaining ring
62
Spring
11
Flatwasher
63
Power supply cable assembly
38 Rear guide bushing
12
Brake support
64
Inching switch
39 Fitting
13
Brake
65
Disconnect knife
40 Pin
14
Rheostat knob
66
Trigger switch
41 Pipe plug
15
Machine screw
67
Flat spring
42 Spring
16
Potentiometer shield
43 Ball bearing
68
Handle assembly
17
Dual potentiometer assembly
44 Preformed packing
69
Plain hexagon nut
18
Current cable assembly
19
Gas hose assembly
45 Machine screw"
70
Lockwasher
20
Boot
71
Flatwasher
40 Setscrew
72
Drive roll
47 Machine screw
21
Rubber bushing
22
Shield assembly
73 Electric motor
48 Nylon screw
49 lnsulation washer
74 Capacitor
23
Guide tube lock screw
24
Wire guide tube
NOTE
If any of the items in the welding gun handle (60-
74, fig. 4-2) appear to be broken, burned out or
disassemble the control monitor.
otherwise damaged, refer to direct support
b. Cleaning and Inspection.
maintenance.
(1) Clean all non-electrical parts with dry
b. Cleaning and Inspection.
cleaning solvent (Fed Spec P-D-680).
( 1 ) Clean all non-electrical welding gun parts
(2) Inspect all parts for physical damage such
with dry cleaning solvent (Fed Spec P-D-680).
as cracks, corrosion, rust or other damage.
(2) Blow out all jets and air passages using
(3) If a component is suspected to be faulty,
compressed air.
such as resistors, rectifiers, etc., refer these
(3) Clean any weld spatters off the nozzle and
problems to direct support maintenance.
guide tube using a knife or similar implement.
(4) Inspect hardware for stripped or damaged
(4) Inspect all hardware for stripped or
threads.
damaged threads.
(5) Inspect plates and covers for rusting,
(5) Check guide bushings and guide tube for
dents or other damage.
evidence of wear, breaks, bends, or other damage.
c. Repair and Replacement.
(6) Check all welding gun parts for evidence
(1) Replace parts that have been physically
of wear, cracking, rusting or other damages.
damaged.
c. Repair and Replacentent.
(2) Replace damaged hardware.
(1) Replace any parts that are broken, split,
(3) Replace inoperative or faulty electrical
or are worn down in such a way that it would
components.
impede proper operation.
(4) Replace plates, covers, and other such
(2) Replace any damaged hardware.
parts that cannot be repaired by straightening,
d. Reassembly. The welding gun may be
cleaning or other simple means of repair.
reassembled by referring to figure 4-2 and reversing
the sequence of disassembly.
4-7