e. Cleaning and Inspection.
(5) Loosen locknut on idle adjusting screw.
(1) Clean all electrical components with a
(6) Turn idle adjusting screw clockwise until
clean, dry brush.
engine rpm increases, then back off one-half turn.
(2) Clean all metal parts in an approved
(7) Tighten locknut.
cleaning solvent and dry thoroughly.
Note. For hydraulic test stand calibration adjust to 176
(3) Inspect all parts for excessive wear. Check
psi @ 340 on flow meter at 2100 rpm.
the coil for continuity. the solenoid for free
c. Installation. Install in
reverse
o r d e r of
movement and the microswitch for no continuity
a above.
until switched by hand, then continuity should be
indicated.
3-9. On-Equipment Electrical Tests
(1) Replace all defective parts.
a. Alternating Current Stator.
f. Reassembly and Installation.
(1) Tag and disconnect motor leads at ter-
(1) Reassemble in reverse order of d, above.
minal board 5CW5063 (fig. 2-2).
(2) Install safety switch in reverse order of
(2) Use a multimeter to te.
c, above.
tween stator leads B and lB, 2B and 3B, A and 1A,
(3) Adjust the switch after installation as in
2A and 3A, C and 1C, 2C and 3C. If continuity is
b above.
not indicated, the alternating current stator must be
replaced.
3-8. Governor (SEORLT Only)
(3) Use a multimeter to test insulation
a. Removal. Remove governor as illustrated in
resistance between the dynamotor-welder frame
and motor leads A and 2A, B and 2B, C and 2C. If
any reading of the multimeter is less than 0.5
megohm, faulty insulation is indicated and the
dynamotor-welder must be removed for further
testing.
(4) Use a multimeter to test insulation
resistance between stator lead 1B and leads 3B, C,
2C. A. 2A; between stator lead 3B and leads C,
2C, A, 2A; between stator lead C and leads 2C, A,
2A; between stator lead 2C and leads A, 2A;
..
between stator leads A and 2A. A reading of less
than 0.5 megohm indicates faulty insulation and
the dynamotor-welder must be removed for further
testing.
b. Revolving Fields.
(1) R sise the revolving field brushes from the
sliprings.
(2) Use a multimeter to test resistance be-
tween the two sliprings. A resistance greater than 10
percent above or below 45 ohms indicates faulty
winding and the rotor must be removed for further
testing.
(3) Use a multimeter to test resistance be-
tween either slipring and the rotor shaft. A
resistance reading of less than 0.5 megohm in-
dicates faulty insulation and the rotor must be
removed for further testing.
Figure 3-7. Governor, removal and installation.
c. Exciter Armature.
(1) R sise the exciter brushes from the exciter
armature.
b. Adjustment.
(2) Use a multimeter to test insulation
(1) Loosen locknut and turn Hi-speed ad-
resistance between the rotor shaft and one of the
justing screw counterclockwise all the way.
exciter commutator bars; repeat this, using at least
(2) Open throttle lever to a maximum
two other bars around the commutator. If any
position.
reading is less than 0.5 megohm, faulty insulation is
(3) Turn Hi-speed adjusting screw clockwise
indicated and the dynamotor-welder must be
until rpm is reduced slightly. tighten locknut.
removed for further testing.
(4) Place throttle lever in idle position.
3-11
