INSTRUCTION BULLETIN
MP CHEMFLO CENTRIFUGAL PUMPAK
MODEL: CHEMFLO 5, 6, 7, 8
READ THIS BULLETIN CAREFULLY BEFORE INSTALLING OR OPERATING THE
PUMPAK
It is important that this instruction bulletin be
read over carefully to fully familiarize yourself
with the PUMPAK assembly arrangement. The
instructions contained in this bulletin pertain to
the installation and maintenance of the PUMPAK
assembly only.
Check the PUMPAK over carefully to make
certain that no parts are missing or broken in
shipment. CAUTION: Do not disturb the
assembly shim at the suction opening of the
pump housing until AFTER the PUMPAK has
been completely assembled to the driver.
Packed separately with each unit are instructions
bulletin, parts list, and literature describing the
PUMPAK.
CONTRUCTION:
The PUMPAK consists of a stainless steel
housing, seal housing motor adaptor, shaft
sleeve, shaft seal, impeller nut, drive clamp, oring, and stainless steel fasteners.
The impeller is screwed onto the shaft sleeve.
The impeller nut secures the impeller on the
sleeve. The shaft sleeve is machined to precisely
fit the shaft on your driver, No provision is made
for an internal drive key and none is required.
The drive clamp assembly takes the place of
internal drive keys, securely locks the shaft
sleeve to the driver shaft, and serves additionally
as a liquid slinger to protect you motor.
The mechanical seal is the self-adjusting,
greaseless type, being lubricated by the liquid in
the pump. It requires no maintenance and
provides long and trouble-free operation.
Because the seal is lubricated by the liquid in the
pump, THE PUMP SHOULD NEVER BE
OPERATED WITHOUT LIQUID IN THE
HOUSING.
In freezing weather, the pump should always be
drained of liquid unless sufficient anti-freeze
solution is in the system.
MOUNTING PUMPAK TO DRIVER:
ROTATION:
Check rotation of driver to be sure in coincides
with the required rotation of the PUMPAK
assembly. When viewed from the driver end
PUMPAK rotation is Right Hand
(CLOCKWISE).
Loosen the drive clamp fasteners but do not
remove. NOTE: If driver shaft is a keyed shaft,
remove the key before installing the MP
PUMPAK. The drive clamp assembly on the MP
PUMPAK is all that is required to drive the
pump. Slide PUMPAK assembly onto the driver
shaft, aligning capscrew holes in adaptor with the
tapped holes in the driver mounting face, until
adaptor contacts the mounting face.
Install fasteners and tighten to secure PUMPAK
assembly to driver, First center, then tighten
drive clamp assembly to lock shaft sleeve onto
driver shaft.
After all fasteners are tight, including drive
clamp assembly, remove the strip stock shim
from the suction eye of the pump housing. This
shim was inserted to establish clearance between
the face of the impeller and pump housing.
Rotate driver slowly by hand to make certain the
impeller does not rub or hit the housing or
adaptor.
If the impeller is rubbing, this means the shim
was displaced during shipment or handling.
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ROTATION: (cont.)
To adjust impeller clearance, do this:
1. Loosen the impeller drive sleeve clamp.
2. Move impeller either forward or back by
using a screwdriver to push impeller
back – or move impeller drive sleeve
forward.
Depending on the seal spring tension, you can do
this by hand without removing the pump housing.
Turn the driver to determine that you have
adjusted the clearance so the impeller does not
rub. Then tighten the impeller drive sleeve
clamp.
IF THE SEAL SPRING TENSION
PREVENTS THIS METHOD OF
ADJUSTMENT, DO THIS:
1. Remove pump housing.
2. Loosen drive clamp, but do not remove.
3. Remove o-ring from housing.
4. Replace housing, pushing against impeller
face. Secure housing with two fasteners, 180
degrees apart.
If it is necessary to install the pump above the
level of the liquid, a priming line should be
connected directly to the suction line. A check
valve must be used in conjunction with a priming
line or the priming liquid will merely pass
through the suction line to the liquid source. The
priming of the suction line evacuates the air in
the suction line and pump. This series of pumps
will not handle air and therefore all air must be
displaced from the suction line and pump before
the pump can operate. Be sure that the pump
housing is filled with liquid before starting the
pump. THE MECHANICAL SEAL IN THE
PUMP MUST NOT BE OPERATED DRY.
Pipe or hose of the same size (or larger) as inlet
and outlet openings should be used on the
installation. When using pipe, avoid sharp bends
and use long radius elbows wherever possible.
This will keep friction loss at a minimum and
allow the pump to operate more effectively. Use
pipe dope on all connections and be sure all
fittings are airtight, especially on the suction side
of the pump. An air leak on the suction side of
the pump will prevent proper operation. A
section of non-collapsible hose between piping
and pump may be used as a vibration dampener.
TO DISASSEMBLE THE PUMP:
5. Securely tighten drive clamp.
6. Remove housing and install o-ring
7. Replace housing.
INSTALLATION:
The MP CHEMFLO centrifugal PUMPAKS
should be installed with flooded suction or as
near to the liquid source as possible.
Drain the system of liquid, break suction and
discharge pipe unions, and, if necessary, remove
all piping from the suction and discharge
openings. Remove the fasteners holding the
pump adaptor to the driver, loosen the drive
clamp assembly, and remove the PUMPAK.
To disassemble, remove the washers and hexnuts
holding the motor adaptor to the housing.
Remove the housing.
Loosen the drive clamp assembly. The impeller,
drive sleeve, seal bellows, and the spring
assembly will now slide forward free of the pump
adaptor.
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The seal seat and seat cup will remain in the
pump adaptor. If not damaged or worn, do not
remove. If necessary, remove from the adaptor
counter bore with a piece of wood or a
screwdriver handle inserted through the adaptor
from the drive end. A sharp tap or two is
usually sufficient to knock out the seal seat. Use
caution in removing the seal seat so as not to
crack a ceramic seat.
TO REMOVE IMPELLER:
Remove seal bellows and spring assembly. On
some models, spring keeper can also be removed
now before removing impeller.
Assemble shaft sleeve; seal spring keeper,
impeller and impeller nut. Before installing seal
bellows and spring assembly, lubricate the shaft
sleeve and rubber bellows with liquid soap or
clean grease and press bellows and spring
assembly onto the shaft sleeve. The spring
should engage the spring keeper at the impeller
end of the shaft sleeve.
To be properly positioned the washer must be
firmly against the rubber bellows member and
the driving lugs of the washer properly engaged.
The raised shoulder on the seal washer should be
facing away from the impeller to contact the
lapped surface of the seal seat in the adaptor.
NOTE: The seal bellows will be bonded to the
shaft sleeve and will require some patience and
caution in removal in order not to damage the
seal bellow and cage.
Remove locknut from shaft; unscrew the
impeller from the shaft sleeve counter-clockwise
from the impeller end.
INSPECTION:
Check all parts for wear. For ease of reassembly
shaft sleeve should have all nicks and burrs
removed. Clean with light crocus cloth.
Replace damaged parts with new parts.
Inspect the seal seat and washer, seat cup, and
seal bellows for grooves, cuts, scuffmarks, or
other deterioration. If any of the parts are
damaged, a complete new assembly should be
installed.
REASSEMBLY:
Slide impeller and seal assembly into the
adaptor. Install drive clamp assembly on the
shaft sleeve but do not tighten.
Proceed with mounting instructions shown
under (MOUNTING PUMPAK TO
DRIVER).
DRIVER REPAIRS:
1. Remove piping, install strip stock impeller
shim.
2. Remove four capscrews which fasten
adaptor to driver.
3. Loosen drive clamp assembly.
4. Remove PUMPAK.
After driver repairs, reinstall PUMPAK
according to instructions shown under
MOUNTING PUMPAK TO DRIVER.
All dirt and foreign matter should be removed.
If seal is to be reused, use soft clean cloth of
wipe seal faces.
Lubricate seal seat cup with liquid soap or clean
grease and press seal seat into adaptor counter
bore, seating it firmly and squarely. Use caution
so as not to mar the lapped face of the seal seat.
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