Section VI. TROUBLESHOOTING
4-10. General
probable causes of the trouble. The corrective
This section provides information u s e f u l in
a c t i o n recommended is described opposite the
diagnosing and correcting unsatisfactory operation
probable cause.
or failure of the shop set and its components.
Malfunctions which may occur are listed in table 4-
Table 4-2. Troubleshooting
Malfunction
Corrective Action
Probable Cause
a. Place power selector switch to
1.
Dynamotor-welder will not start
a. Power selector switch in OFF
when internal power is used.
position
GEN (para 2-13a).
b. Increase RPM (para 2-13a).
b. RPM too low.
Interchange any two incoming power
E x t e r n a l power lines connected
2.
Dynamotor-welder
rotates
in
wrong.
wrong direction when external
leads. (para 2-13 b).
power is used.
a. Clean air cleaner (para 3-8).
a. Air cleaner clogged.
3. Air compressor air pressure low.
b. Adjust or replace switch (para
h. Electric pressure switch defective
4-32).
or out of adjustment.
Adjust or replace switch (para 4-32).
Electric pressure switch defective or
4. Air compressor air pressure too
out of adjustment.
high.
a. Bleed system (para 4-26).
5. Side lifting hydraulic system does
a. Air in hydraulic system.
b. Replace cylinder (para 4-27).
b. Side lifting cylinder defective.
not operate properly.
c. Replace pump (para 4-26).
c. Side lifting hydraulic pump
defective.
6. Sides lower too quickly or too
Adjust or replace flow control valve
Side lifting hydraulic pump flow
slowly.
c o n t r o l v a l v e n o t adjusted
properly or defective.
Section VII. MAINTENANCE OF ELECTRICAL SYSTEMS
4-11. General
a. Removal. Remove the service and blackout
clearance lights as illustrated in figure 4-1.
The shop set contains three electrical systems: A
b. Cleaning and Inspection.
24-volt D. C. system, an alternating current system,
(1) Clean all parts with approved cleaning
both 120- and 240- volts, and a D.C. welding
solvent and dry thoroughly.
system. The 24-volt system, powered by the bat-
(2) Inspect all parts for damaged threads,
teries, is comprised of the driving lights and the.
bends, cracks, breaks and other damage. Inspect
internal emergency lights. The alternating current
for a defective lamp and any corrosion. Replace any
system includes all shop set lights, switches, and
defective parts.
receptacles for 120- and 240-volts. Refer to figures
c. Installation. Install the service and blackout
1-4, 1-5, and 1-6, for the wiring diagrams.
clearance lights as illustrated in figure 4-1.
