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TM 55-2915-335-30&P
2-23. ELECTRICAL CIRCUITS - lNSPECT/REPLACE
2-23
This task covers: Replacement of negative and positive secondary brush circuits.
INITIAL SETUP
Tools:
Aircraft Electrician’s Tool Kit, NSN 5180-00-323-4915
Soldering Iron NSN 3439-00-853-8760, or equivalent
Heater Gun, 200 to 500 deg F,
NSN 4940-00-785-1162, or equivalent
Brush Holder Centering Tool, Item 1, Appendix D
Personnel Required:
68F Aircraft Electrician
66-Series Inspector
Equipment Condition:
Pump-end brush holder assembly removed from
housing PARA 2-20.
Material/Parts:
Solder, Rosin-Core, QQS-571E
Electrical Wire, 18 AWG,
NSN
-
-
-
Heat Shrink Tubing 0.250 Inch I.D.
NSN 5970-00-935- 0082
Heat Shrink Tubing, 0.062 Inch I.D.,
NSN 5970-00- 935-0083
Thread Locking Compound, NSN 8030-00-111-2762
1. INSPECTION
a.
b.
c.
d.
e.
f.
Check for continuity between points A and B. If
open, replace negative secondary brush circuit.
Check for continuity between points B and C. If
zero ohms, RFI capacitor is shorted. If shorted,
replace negative secondary brush circuit.
Check for continuity between points C and D. If
open, replace positive terminal lead per the in-
structions and illustrations in paragraph 2-24.
Check for continuity between point D and impel-
ler housing. If zero ohms, positive terminal is
shorted to the housing. If shorted, replace positive
terminal per instructions and illustrations in
paragraph 2-24.
Check for continuity between points E and F. If
open, replace positive secondary brush circuit.
Check general condition of all wiring. If insulation
or shrink tubing is cracked or charred, replace
circuit. Check brush solder joints for loose fit or
cracking. Resolder loose or cracked brush solder
joints.
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