TM
55-6680-234-40
Table 5. Nondestructive Inspection Test Data -- Continued
Allowable
Type of
Procedure
Nomenclature
Item No.
Defects
Test
No defects
Inspect leads, espe-
Stator Assemblies
Visual
13 of figures
acceptable.
cially at point of
9&11
entry into stator,
for crimps, breaks
and defective in-
sulation.
Inspect tapers for
No defects
Shafts
Visual
7 of figure 8, 1&
pitting, scars, wear,
acceptable.
7 of figure 10
and other damage
Examine shaft for
bending and dis-
tortion.
disassembly, place glass cover (2) and end
10. Testing Components
of case (3) in bezel (1); place a ring of sol-
Test stator assemblies for insulation break-
der, Federal Specification QQ-S-571, Comp
down using insulation breakdown test set
Sn 63, under the glass. Place parts in an
13700-1-C. Apply a potential of 500 volts
induction coil or on a hot plate; heat to effect
rms at a commercial frequency for a period of
a proper soldered joint. If necessary, insert
five seconds between any lead and the lamina-
additional solder inside case along edge join-
tions. There shall be no electrical breakdown
ing case and glass. Do not allow solder to
of insulation. Failure of test requires replace-
remain on outer surface of case or bezel. Al-
ment of the defective stator assembly.
low parts to cool undisturbed.
11. Repair and Replacement
removed from end cover, reassemble as fol-
lows. View end cover from rear; place open-
Replace all parts which are obviously
ing for eyelet at the 180 degree or 6 o'clock
cracked, worn, distorted, damaged beyond re-
position. Solder in each receptacle so that
pair, or which do not meet inspection or test-
its polarizing key is located at the 12 o'clock
ing requirements and cannot be restored to
position in its opening in the end cover.
serviceable condition by allowable repairs.
12. Lubrication
semble as follows. Place housing in an oven
at 200. 20F for a period of two hours.
Immerse stator assembly in dry ice or place it
in a freezer at -50 F or colder for a period
tion.
of two hours. Stator must be installed in
Lubrication of bearings is critical. Proceed
housing in following position. View housing
as fdllows: Lubricate each bearing (20 of fig-
from the rear; place flat on housing at the 3
o'clock position: stator leads must extend
of figure 11) with three drops of oil from a
from the housing at the 6 o'clock position.
No. 26 hypodermic needle held at an angle of
Within five minutes after removing parts from
45 degrees. Use oil F-44 versalube which is a
oven and dry ice or freezer, use alignment fix-
grease plating lubricant manufactured by
ture shown in figure 2 to insert stator in hous-
General Electric Co.
ing in specified position.
13. Reassembly
a. Reassemble the indicator in the reverse
ic circuit, demagnetize it as follows. First use
order of disassemble y, observing the following.
magnetreater Model 889A to completely de-
magnetize the magnet assembly. Then use
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