29
Always flush pump with water, or neutralizing agent
before servicing.
Refer to the illustrated Parts List for part ordering
information.
Pump Housing Disassembly
In most cases, seal replacement requires
disassembly of only the pump half of the unit.
1.
Remove the four casing cap screws with 9/16"
box end wrench. Tap pump casing on discharge
port with rubber hammer, if necessary, to break
loose from mounting flange. Check inside of pump
casing including suction port. If badly eroded (or
damaged), pump casing should be replaced.
Remove O-ring and discard. O-ring should always
be replaced.
2.
To remove the impeller nut, clamp the flange
in a vise and insert a large screwdriver or file (at
least 10" long) into impeller vanes to prevent
impeller from turning when loosening nut. Use a
5/8" box end or socket wrench to remove the
impeller nut by turning it counterclockwise. See
FIG. 21.
2.
Remove stationary seat and boot by prying out
with two small screwdrivers in manner similar to
impeller removal. (Caution: The seal will be
damaged by removal in this manner. A new seal
and rubber gasket MUST be used when pump is
reassembled.)
Clean-Up of Pump Housing
1.
Using a circular bottle-type wire brush with air
or hand drill, clean the discharge port, suction port
and the sealing areas of the O-ring on the pump
casing and mounting flange.
2.
After wire brush cleaning, it is recommended
that the pump casing and mounting flange be
further cleaned in a solvent tank to remove rust
and corrosion particles.
Seal Replacement/Pump Housing
Reassembly
NOTE: Reassemble if drive end is not to be
repaired.
Be extremely careful with the new seal. Take
special care not to scratch the lapped sealing faces
of the rotary washer and stationary seat.
1.
Lubricate seal cavity in mounting flange with
mineral oil or glycerin.
2.
Install the stationary portion of the mechanical
seal by sliding over the shaft with the ceramic side
out.
IMPORTANT: Make sure both seal cavity and
seal are clean and lubricated. Never run the
sealing faces dry.
3.
To seat the seal in the seal cavity, use a piece
of 3/4" PVC pipe 4" to 6" in length. Press it in firmly
and squarely.
4.
To install the rotary portion of the mechanical
seal, place it over the shaft with the carbon side
facing in, and press until it bottoms out against
the stationary portion. Install rubber spacer. See
FIG. 22.
5.
Insert key into shaft key slot. Place impeller
on shaft. Put impeller nut on shaft end using a
large screwdriver or file in the impeller vanes for
support, tighten impeller nut securely.
6.
Install O-ring on mounting flange. Replace
O-ring.
7.
Place pump casing on mounting flange, insert
and tighten bolts evenly.
3.
Once nut is removed, place a screwdriver on
each side (FIG. 21) behind the impeller and pry
away from the mounting flange. Remove woodruff
key from the shaft. Remove O-ring from the
mounting flange.
Pump Seal Removal
1.
Lightly lubricate shaft with mineral oil or
glycerin for easier removal of seal. Using two
screwdrivers positioned opposite each other, pry
the rotary portion of the seal from the shaft. See
FIG. 22.
FIG. 22
FIG. 21
MAINTENANCE
41442 PTO PUMP
Summary of Contents for 41440
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