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Figure 4-7. Fifty-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-P0046
TM 9-1375-213-34&P
tly rub contact surface of
(b) After removing leather strap,
each brush on grit, while
wash case and wooden handle
holding brush perpendicu-
with cloth dampened (not satu-
lar to paper.
rated) with soap and water.
Do not splash water into
plunger hole.
Wipe off
machine with clean, damp
NOTE
cloth to remove soap, then dry
thoroughly with a clean, dry
One or two short passes should be suffi-
cloth. Use soap and water to
cient to clean brush and flatten contact
clean strap, and wipe dry imme-
surface.
diately.
(c)
Inspect wooden case for severe
damage. If a panel requires
3. Wipe brushes clean with a
replacement, arrange for DS
clean. soft cloth.
box repair personnel to make
panel for replacement in (1) 12.
4. Measure length of brush
below. If no car enter shop
from contact surface to
facilities are available,  finish
shoulder brush. If length
procedure below, then ship
is less than 1/32 inch for
machine to a higher mainte-
either brush, replace both
nance level where such facili-
brushes.
ties are available. If broken
woodwork precludes any use of
machine,  t a k e n o  further
action except to ship machine
NOTE
to a depot for salvage by canni-
balization.
Brushes for these machines are not
stock items because of their low use
However, these
rate and long life.
brushes may be obtained by direct
NOTE
order from the manufacturer or they
may be salvaged from damaged
If leather carrying strap is severely dam-
machines.
aged or broken, repair or replace with
any suitable locally available materials.
(g) Remove and service armature
as follows:
(d) Remove both access panels
from machine.
cotter  pin  from
1.
Remove
gear shaft and pull off
(e) Move plunger up and down
large and small gears and
and observe drive mechanism
all four related washers
to see if it is working properly.
(fig. 4-4). If a washer is
If there is any binding, or if
not readily apparent, it
components are disconnected,
may be stuck to a gear or
make note of defect and cor-
the end cap.
rect in steps below.
2. Pull out rack.
(f)
Carefully remove brush retain-
ers and service brushes as fol-
3. Remove screws securing it
lows:
and take off end cap and
attached armature.
Remove  brush  retainers
1.
and
withdraw
spring-
4. Wipe off commutator with
loaded brushes, taking
a clean cloth and inspect it
care not to let brushes
ground-in
brush
for
escape.
deposit, dirt, pits, or heavy
wear.
2. Hold flint paper, grit up,
on a flat surface and gen-
4-33

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