TM 5-3895-374-24-2
4.3.2 SEAL STRIPS
Seal strip replacement procedure is the same for both
Standard Duty and Heavy Duty Roto-Flo Feeders.
A.
Remove the feeder from the installation
B.
Remove the chain from the feeder sprocket.
CAUTION
Neoprene and Urethane seal strips
are installed on the trailing edge of
the rotor. Teflon, brass and steel
strips are installed on the leading
edge of the rotor. New seal strips
must be installed in the same edge as
the original seal strips.
C.
Turn the feeder sprocket in a clockwise direction
(facing the drive end) until one seal is completely
clear.
D.
Unbolt the seal strip holder and remove old seal
strip.
E.
After brushing off loose material from the tip of
the rotor and behind old seal, fit in the new seal
strip. The Neoprene and Urethane seal strips
have oversized holes furnished so that the new
seal strip can be placed as high as possible on
the rotor. The seal strip should be slightly above
the feeder inlet so that it will curve back from the
direction of rotation. Hard seal strips such as
brass or steel should be installed with clearance.
See 4.3.4.
F.
Install seal strip holder and turn down cap
screws finger tight Tighten all screws with
wrench.
G.
Advance the rotor to the next position either by
turning the feeder sprocket by hand, or by
placing a pipe wrench on the sprocket hub. DO
NOT use pipe wrench on rotor shaft.
You will note that the feeder will become progressively
harder to turn with the installation of each new flexible
seal, but this tightness is a must if the feeder is to have
an air tight seal. A few drops of oil on each seal will
reduce the friction and allow the rotor to be turned easier.
4.3.3. LIP SEALS
Roto-Flo Standard Duty Feeders are equipped with lip
seals.
A.
After removing the old seal, remove all loose
material and make sure there are no burrs in the
seal cavity.
B.
Put a light film of oil or grease on the lip at the
seal so that it slides onto the shaft easily.
C.
Press the seal into the seal cavity with the lip
pointing toward the inside of the headplate.
Press it in until it bottoms out.
D.
Press the bearing back in the same way it came
out Le. Set screws toward the outside of the
headplate.
E.
When the lip of the seal reaches the diameter
that it rides on, gently rotate the headplate onto
the shaft. It is important that you don’t invert the
lip of the seal and pop off the spring.
F.
Bolt the headplates in place, set the clearances
as specified in Section 4.3.4. or as previously
set, and then lock the bearing set screws.
4.3.4. ROTOR REPLACEMENT
Roto-Flo Feeders standard rotor end and tip clearance is
.007-.008 inches. The actual clearance for a given
feeder may be different due to special applications such
as abrasive service or high temperature. Consult the
factory
for
rotor
replacement
to
ensure
proper
clearances for a specific feeder.
CAUTION
After
completion
of
maintenance
work, reinstall the Roto-Flo Feeder in
the system making sure that the
sprockets
and
drive
chain
are
properly aligned and the drive guard
is in place. Reconnect any air purge
and vent piping.
page 3 - 731
