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 (2)
Maintenance and adjustment.
i. Bottom Screw.
(a) Maintenance required is the replacement
(1) General. The bottom screw, located in the
of cartridges. Replacement is indicated when, because the
bottom of the frame, supports the thrust bearing for the bowl
cartridges are collecting colloidal carbon, resistance to the flow
spindle and it is used to adjust the bowl to its proper height in
of oil through the cartridge element begins to increase.
the cover.
(b) To replace a cartridge, see operating
(2) Removal.
instructions.
(a) To remove bottom screw, remove bowl
(3) Removal.
and spindle as described in c. and f. above.
(a) To remove heater elements from heater,
(b) Drain lubricating oil from frame oil
disconnect electrical leads to heater.
reservoir.
(b) Drain heater and remove bolts which hold
(c) Remove locknut from bottom of frame.
heater end covers to heater body.
(d) Remove bottom screw by hand or, if
(c) Remove elements from heater assembly.
necessary, with the aid of a screwdriver.
(4) Cleaning, inspection, and repair.
(e) When removing bottom screw, do not
(a) Inspect sight glass and lines for signs of
lose steel ball inside, which may come out through the hole in
leaks. If sight glass leaks, remove retaining rings and replace
top of screw.
gasket on sight glass.
(3) Disassembly.
(b) Tighten all pipe fittings which show signs
(a) To remove parts in bottom screw, drive
of leaks. Replace gaskets in pipeline flanges where necessary.
out the cross pin after which the spring, sleeve, and ball will
(5) Installation.
Replacement of parts and
come out.
installation of heater on purifilter unit, is in reverse order or
(b) Remove bushing in top of bottom screw
removal.
by driving out with a small piece of hardwood.
(c) Remove steel point using a punch and
k. Motor.
hammer.
(1) General. The prime mover of the lubricating oil
(4) Cleaning, inspection, and repair.
purifier is a 1/2-hp, 115-volt dc electric motor. The unit is bolted
(a) Inspect the point for signs of wear, and
to the side of the purifier frame and is directly connected
replace if point shows any wear marks.
through the friction clutch to the centrifuge spindle.
(b) Inspect sleeve for wear marks and
(2) Maintenance and adjustment.
replace if defective.
(a) Lubricate in accordance with LO 55-
(c) Wipe all parts with a lint free cloth prior to
1925-204-12-7.
assembly.
(b) Inspect commutator and brushes. Clean
(5) Assembly.
dirty commutator with 00 sandpaper. Replace brushes worn to
(a) Assemble bottom screw in reverse order
one half normal length and "sand in" to contour of commutator
of disassembly.
(TM 55-506). Adjust brush tension.
(b) Install steel point by dipping in oil and
(3) Removal.
tapping lightly on a piece of wood to seat it.
(a) Disconnect motor electrical connections.
(6) Installation.
(b) Remove pump housing plate from frame
(a) Installation of bottom screw is in reverse
on opposite side from motor, and remove worn wheel and
order of removal.
friction clutch.
(b) With spindle and bowl in place, measure
(c) Support motor and remove four screws
height between coupling ring and top edge of frame bowl
located inside the frame, which hold motor in place.
casing. Coupling ring on disc should extend exactly 9/16 inch
(d) Remove motor from purifier frame, being
above top edge of frame bowl casing. Should bowl be above or
careful not to damage drive shaft while withdrawing from frame.
below its proper position, adjust by turning up or down, as
(4) Disassembly.
necessary, to bring to proper position.
(a) Remove screws that hold commutator
(c) Fill oil reservoir with lubricant in
endbell to motor frame and pull endbell and brush holder from
accordance with LO 55-1925-204-12-7.
motor shaft.
(d) Replace bowl cover.
(b) Remove screws which hold drive endbell
j. Heater and Filter Unit.
to motor frame and remove drive endbell and armature
assembly.
(1) General. The heater and filter unit is installed in
(c) Remove brush holders from commutator
close proximity to the purifier. The purpose of the heater is to
raise the temperature of the oil being purified to 180oF. The
endbell; mark position for assembly.
(d) Pull drive endbell from armature shaft.
filter unit is a replaceable cartridge type and it removes
(e) If bearings are to be replaced, bend tabs
impurities from the oil which were not removed by the
centrifugal purifier.
5-125
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