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TM 55-2915-335-30&P
2-20. PUMP-END BRUSH HOLDER ASSEMBLY - lNSPECT/REPLACE/REPAIR (Cont)
2-20
d.
e.
f.
g.
h.
i.
j.
Use a 6 inch (152,4 cm) rule to measure brush
length A. If length A is less than 1/4 inch (6,4
mm), replace both brushes. Refer to paragraph 5
for brush assembly instructions.
Inspect contact area B of brushes for cracks or
chipping. Replace brushes if cracks or chips are
found on any surface in area B.
Inspect shunt leads for fraying. If frayed, replace
brush.
Check to make sure shunt lead is tight in brush. If
shunt lead is loose in brush, replace brush.
Check shunt lead terminal lug to make sure it is
tight on shunt lead. If terminal lug is loose, replace
both brush and terminal lug per paragraph 5.
Inspect springs for broken links or obvious signs of
damage. Replace broken or damaged springs.
Inspect tension of brush springs.
(1)
(2)
(3)
Place spring over brush holder mounting
stud. Set straight end of spring behind keeper
ledge on brush holder. Place brush holder on
flat surface and hold tightly to keep it from
moving.
Hook pull scale to brush end of spring. Pull
brush end of spring until it is in-line with op-
posite end of spring. Read the spring tension
in ounces on the pull scale. If spring tension
is less than 21 ounces or more than 33
ounces, replace spring.
Repeat spring tension test on other spring.
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