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 (a) To remove clutch from the purifier,
NOTE
remove pump housing plate from frame.
The coupling ring has left-handed threads
(b) Withdraw the pump assembly from frame
and must be turned clockwise to remove.
and lay carefully on deck, hub up.
(d) Remove tubular shaft (1) and discs as a
(c) Lift out friction hub from pump assembly.
unit and place in pail of solvent which meets requirements of
(3) Disassembly.
FED SPEC P-D-680.
(a) Remove clutch blocks from friction hub.
(e) Scrape bowl shell with scoop to loosen
(b) To remove worm wheel ring (11, fig. 5-
and remove dirt that has collected on periphery.
(f) Place disc (wet with solvent) into bowl.
in place.
(g) Reassemble bowl in reverse order of
(4) Cleaning, inspection, and repair.
disassembly.
(a) Inspect clutch blocks for signs of wear
(h) Unlock bowl by loosening locking screws.
and replace those worn excessively.
(i) Start machine without admitting oil and
NOTE
run it dry for 5 minutes.
Clutch blocks may be replaced one at a
NOTE
time; it is not necessary to replace the entire
This will spin all dirt from discs by
set.
centrifugal force.
(b) Inspect the worm wheel ring and worm
(j) Seal with water in accordance with
shell for signs of wear. If either is worn they may be reversed,
operating instructions and unit is ready for operation.
end for end, to give double wear.
(3) Cleaning, inspection, and repair.
NOTE
(a) To replace discharge ring (16), remove
cover from bowl, lock bowl in place and remove coupling nut (3)
When either the worm screw shell or the
with special wrench listed in Table 4-1.
worm wheel ring become worn and need to
(b) Lift discharge ring (16) from its seat in
be reversed, they should both be reversed at
bowl top.
the same time. If either has to be replaced,
(c) Replace discharge ring in reverse order of
replace both the shell and ring.
disassembly.
(5) Assembly.
(d) Inspect discharge gasket (4) and bowl
(a) Install worm wheel ring on friction ring.
ring gasket (6) whenever bowl is cleaned. Replace if gasket
(b) Install the friction blocks in friction ring
shows signs of wear.
and install friction hub so that the two driving pins enter
d. Clutch Assembly.
between the blocks.
(1) General Connection between the prime mover
(c) Position thrust washer and key on shaft
and the centrifuge is made by a friction type clutch which
and slide assembled wheel and clutch on shaft.
employs clutch blocks installed in a friction hub and worm
(d) Push assembly tight against thrust
wheel and gear. This arrangement enables the centrifuge to
washer. Install pump housing. and bolt in place.
pick up speed slowly when the motor is started. Top speed of
e. Pumps and Relief Valve.
the centrifuge is approximately 7200 rpm.
(1) General. There are two gear type pumps
NOTE
installed on the unit. The inlet and the outlet pump. The
Disc's are not to be replaced individually.
capacity of the inlet pump exceeds that of the outlet pump.
Disc's are dynamically balanced and must
Each pump is provided with a relief valve.
be replaced as a unit.
(2) Removal.
(2) Removal.
(a) Remove capscrews that hold pump
housing plate (4, fig. 5-92) to purifier.
5-122
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