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Figure 4-5. Fidelity-type 10-cap blasting machine - partially disassembled.
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TM-9-1375-213-34-P Demolition Materials Manual
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NOTE - TM-9-1375-213-34-P0040
TM 9-1375-213-34&P
1. Remove the screws hold-
6. Neat's-foot oil.
ing brush holder to stator,
carefully pull brush holder
7. A roll of fresh cellophane
away from stator, and
tape.
remove brushes, taking
care not to let spring-
loaded brushes escape.
NOTE
2. Hold flint paper, grit up,
No other type of tape except cellophane
on a flat surface and gen-
should be used and tape must be fresh.
tly rub contact surface of
each brush on grit, while
holding brush perpendicu-
lar to paper.
8. A screwdriver.
9. An electrician's knife.
NOTE
10. A roll of electrical tape.
One or two short passes should be suffi-
11. Soap and water.
cient to clean brush and flatten contact
12. Soldering iron.
surface.
13 Rosin core solder.
3: Wipe brushes clean with a
(b) After removing leather strap,
clean, soft cloth.
clean handle and exterior of
machine with a cloth damp-
ened (not saturated) with sol-
4 . Measure length of brush
from contact surface to
vent. Use soap and water (not
shoulder of brush.
solvent) to clean leather strap
and wipe dry immediately.
a. If length is leas than
3/32 inch for either brush,
(c) Inspect machine case for cuts
replace both brushes (and
or holes and any damage
springs) with new ones, if
which would preclude sealing
available, and discard old
of cover and case. If such dam-
brushes (and springs).
age is present, replace strap
and ship machine to a depot
for salvage by cannibalization.
NOTE
(d) Insert handle and turn it to
see if mechanism is in working
If new brushes are not available, old
If handle cannot be
order.
brushes with length of at least 1/32
turned without exerting undue
inch may be be used until new brushes
force or if unusual noises
are ordered and received. If brushes
result when the handle is
with length less than 3/32 inch are
turned, make note of defect,
used, put a tag on machine instructing
check troubleshooting chart
user to return machine when new
(table 4-3), and correct as indi-
brushes are in stock.
cated below.
(e) Remove the two screws secur-
ing case to cover and pull off
b.  If  brushes  have  a
cover (with attached parts). If
length less than 1/32 inch,
any dents are present in case,
and no replacement
remove them by  pushing or
brushes are available com-
pounding them out from inside.
plete procedures below
and set machine aside
(f)
Remove brush holder and serv-
until replacement brushes
ice brushes as follows:
are obtained.
4-27

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