Pentair Myers MSP4 Manual

NOTE! To the installer: Please make sure you provide this manual to the owner of the equipment or to the responsible
party who maintains the system.
MODELS MSP4/MSPD4
MSP6/MSPD6
SELF-PRIMING SEWAGE
AND TRASH PUMPS
INSTALLATION AND SERVICE MANUAL
Part # 23833A566 | © 2014 Pentair Ltd. | 08/01/14

2
GENERAL INFORMATION
The MSP and MSPD self-priming centrifugal pumps
have a semi-open impeller and suction flap valve.
Pump is designed to handle raw unscreened sewage,
mild industrial waste and slurries containing entrained
solids. The material of construction is a cast iron
volute case and bearing frame, ductile iron impeller
and wear plate.
CALIFORNIA PROPOSITION 65 WARNING:
This product and related accessories
contain chemicals known to the State of California to
cause cancer, birth defects or other reproductive harm.
Attention:
This manual contains important information for the
safe use of this product. Read this manual completely
before using this product and refer to it often for
continued safe product use. Do not throw away or
lose this manual. Keep it in a safe place so that you
may refer to it often.
Unpacking Pump:
Remove pump from pallet. When unpacking unit,
check for concealed damage. Claims for damage
must be made at the receiving end through the
delivery carrier. Damage claims cannot be processed
from the factory. Check for and tighten all loose
attaching hardware. Check oil levels and lubricate
as necessary.
WARNING: Before handling these pumps and
controls, always disconnect the power first. Do not
smoke or use sparkable electrical devices or flames in
a septic (gaseous) or possible septic area.
Pump Not Operating or In Storage:
If pump is not put into service immediately, it must be
properly stored to prevent damage. Store unit in a dry
warm location. Never store unit in the open even if it is
protected with plastic or other covering. The bearing
housing and motor will draw moisture, which may
result in pump failure after being put in operation.
While in storage, pumps with carbon ceramic seals
must have impellers manually rotated (6 to 12
revolutions) after sitting nonoperational for three
months or longer and prior to electrical start-up.
Pumps with tungsten carbide seals must have
impellers manually rotated (6 to 12 revolutions) after
sitting nonoperational for three weeks or longer and
prior to electrical start-up.
Motors:
Pump unit may be shipped without the motor for
customer to supply and mount.
Motor Types:
Pumps can be driven by drip-proof or totally enclosed
fan cooled motors. If motor is to operate in the open,
or in a dusty location, a totally enclosed fan-cooled
motor must be used. If pump is to operate in a damp
location, a motor with encapsulated winding should
be used. Motors are to be sized so that no overload
will exist in the operating range of the pump.
Note: When pump units are mounted at the factory,
the driver and pump are aligned before shipment.
During transit and handling of pump and components,
misalignment may occur. Before operation the drive
alignment should be checked.
Shaft Couplings:
We recommend using Wood's flexible coupling to
prevent misalignment and noise that can be caused
by other couplings. The extra cost of the coupling is
easily saved in installation and field service that can
result from coupling problems.
V-Belt Drive:
Where V-belts are used, keep belts tight by adjusting
motor base screws. Belts should run cool. If belts
heat up it will indicate slipping. The V-belts should be
fiddle-string tight.
CAUTION: Belt guards and coupling guards must be
properly installed before operating pump unit.
Electrical Starting Equipment:
If electrical starting equipment is not furnished with
pump, certain precautions must be observed in
selecting motor starter.
Type of Starter:
For three phase power, a magnetic starter with 3-leg
overload protection is recommended to prevent
motor burnout that can occur from single phasing or
transformer faults on three phase systems. For single
phase motors a standard starter with 2-leg overload
protection is recommended.

3
Electrical:
1. For motor overload protection the magnetic
starter trip amp rating should not be more than
1.25 times the full load amps of the motor. Myers
recommends a rating of 1.15 times the full load
amps of the motor.
2. Always use fused disconnect switch or circuit
breaker ahead of magnetic starter for short
circuit protection. When duplex pumps are used
and are operated from single disconnect switch,
be sure disconnect switch is large enough to
withstand the starting current of both pumps
coming on at once. This can occur after a power
failure. This is important as a blown fuse or
tripped circuit breaker can make both pumps and
an alarm system inoperative, resulting in flooding
or other damage.
Ground:
Connect a ground wire to motors, control box and
other related controls. Ground wire is to be sized to
the National Electric Code article 250-95. Ground
wire must be connected to a driven ground stake or
to a ground wire from the supply service. If a ground
stake is used, it must be driven at least 8 feet into
the ground.
Codes:
All local wiring codes must be observed, and
any exceptions to data given must be followed in
accordance with the local code. Consult the local
inspector before installation to avoid costly delays that
can occur due to rejection after job is finished.
PUMP INSTALLATION
Pump Installation Foundation:
Pump frame or base should be installed on a concrete
floor with proper shims and grout. Use hardwood
tapered shims to drive under base to level. Base
should be about 1" to 1½" off the floor. Build form
around the base and fill base inside cavity with grout.
Foundation bolts can be set in the grout or set in the
concrete floor with expansion bolts.
Grout should be made with 1 part cement and 2 parts
sand. Mixture should be fluid enough to run under
base. Wood shim blocks can be removed after grout
has set and holes filled with quick set cement.
Piping:
All piping to suction and discharge openings of pump
must be supported to remove stress from the pump
case and bearing frame.
Suction Pipe:
1. Suction pipe should be the same size as pump
opening. Do not use larger suction pipe as
priming time will be increased and velocity may
not be high enough to properly carry solids.
2. Pump should be installed as close to the liquid
being pumped as possible with a minimum of
elbows or fittings.
3. To avoid air pockets, suction pipe must be as
short and direct as possible. Suction pipe must
always slope upward to the pump from the
source of the liquid being pumped.
4. The suction pipe should be installed at a distance
equal to 1½ times the diameter of the suction
pipe from the wall of the wet well, minimum.
5. The suction pipe should be installed at a distance
equal to one half the diameter of the suction pipe
or 3" from the floor of the wet well, minimum.
6. If more than one suction pipe is to be installed
in the same wet well, a distance equal to at least
3 times the diameter of the suction pipe should
separate them.
7. Submergence of the suction pipe is critical to
efficient pump operations. Submergence may be
reduced by installing a standard pipe increaser
fitting at the end of the suction pipe. The larger
opening size will reduce the inlet velocity and
required submergence.
Vertical Suction Lift:
Vertical lift should not be more than 25 feet. This is
for starting level only. After pump primes, level can
be pumped down to 26 to 27 feet if desired, but
sump level must rise to the original level for restart.
All suction line joints must be airtight, as a leak in the
suction pipe can cause the pump to lose prime or not
prime at all. Always check N.P.S.H. calculations for
available atmosphere pressure before applying pump.
Discharge lines:
If the discharge line ends at level lower than the liquid
being pumped, a siphon breaker must be installed in
the discharge line. Otherwise, siphoning action may
cause damage to the pump. The discharge line should
include a system check valve, with outside weight
or spring, to protect the pump from excessive shock
pressure and reverse rotation when pump is stopped.
Do not depend on the check valve at pump suction
to hold discharge pressure. The discharge line should
include an isolation valve, plug valve or gate valve,
to isolate the pump from the discharge line. This will
allow maintenance to be performed on the pump or
check valve without draining the discharge line.
Air Bleed Pipe:
A ¾" or 1" bleed line with ball valve or gate valve
must be installed between the pump discharge flange
and discharge check valve. The bleed line should be
installed as close to the discharge check valve as
possible, with the end extending a minimum of 6"
below low water offset point in the wet well. The valve
in the bleed line is to be fully open at initial start-up
of pump. After initial start-up the valve is to be left
partially open at all times. This will allow any trapped
air or gas to be vented back to the wet well. Be sure
vent line is under water at all times. Self-priming

4
pumps will not compress air to any extent. Pump may
not prime if the bleed line is not used or closed, and
may not reprime if pump loses prime after discharge
line is full of water and a discharge check valve
is used.
Drain Line from Pump Case:
A pipe should be installed in the lower drain tapping of
volute case and be piped back to the wet well. Install
a shut-off valve, ball valve or gate valve in this line.
This will permit draining of pump case if necessary
to remove suction elbow/plate to clean impeller or
perform maintenance on the pump.
Electrical Connections:
Connect power lines to motor from magnetic starter.
Turn pump shaft by hand to be sure it is free before
attempting to start motor. Turn power on and off
quickly to check rotation. If motor is three phase,
interchanging any two lines to motor can reverse
rotation. If motor is single-phase consult literature
supplied with the motor for specific instructions.
Correct pump rotation is clockwise when looking at
pulley or coupling end (power end) of pump. Direction
arrow is cast on bearing housing.
Priming:
For initial prime, remove priming cap from suction inlet
casting and fill pump housing with water. Fully open
the air bleed valve in the bleed line. Replace cap,
being sure gasket is in place and that seat is clean.
Start motor and allow sufficient timing for priming.
Priming time is dependent on pump speed, impeller
diameter and vertical suction lift.
Cleaning Impeller:
If impeller gets clogged at any time, suction cover
can be removed by unscrewing four hand knobs or
nuts. Drain pump case before removing suction cover.
Tap on knobs with hammer to loosen. Be sure O-ring
gaskets are in place before replacing suction elbow/
plate. Use grease on machined faces to make removal
easier at a later date. Tap on hand knobs with hammer
to retighten.
Adjusting Impeller Clearance:
Impeller face vanes must be within .015" of suction
wear plate for most efficient operation.
When wear plate or impeller wears, it can be
readjusted to proper clearance from the outboard
bearing end without the use of shims or disturbing the
pump case or piping. Loosen the three screws with
the jam nuts. Tighten the other three screws evenly
until the impeller just drags on the suction wear plate
when the shaft is turned by hand. Back off the three
screws and place a .015" shim under the head of the
screw. Turn screw up against the shim, then remove
shim. Repeat this operation on each of the three
pushing screws. Now retighten the three screws with
jam nuts, pushing the housing up against the three
adjusting screws. Retighten the jam nuts and pump
is ready to operate with the impeller face .015" from
suction wear plate.
This clearance should be checked at least once a
year and more often if water containing abrasives is
being pumped. When impeller face wear exceeds
1/8", impeller, wear plate and volute lip plate should
be replaced.
PUMP MAINTENANCE
Replacing Impeller and Volute Lip Plate:
Disconnect power from the motor before attempting
to work on pump. Drain pump volute case and oil
from seal chamber. Remove suction elbow/plate with
wear plate attached. Clean any trash out of pump
volute, clean all machined surfaces, and wipe all
ports clean.
The following describes and pertains only to the
new 4" self-priming pump. Remove stainless steel
socket head impeller screw that locks impeller to the
shaft. This screw has a right-hand thread. Remove
impeller lock washer with pin. Block impeller vane
with a piece of hardwood and unscrew impeller by
turning pump shaft counterclockwise. Impeller shaft
has a right-hand thread. Use large crescent wrench or
strap wrench on shaft, pulling against the key. A pipe
wrench can be used if care is used not to damage
shaft. It may be necessary to tap on impeller vanes
with hammer to break impeller loose, especially if
pump has been in service for a long period of time.
The following describes and pertains only to the 6"
self-priming pump. Use a taper fit impeller shaft. If
impeller is held to the shaft with a taper fit, remove
the stainless steel nut on the end of shaft, then
remove washer. A taper fit shaft can be identified by
the key that drives the impeller. To remove impeller,
loosen three holding screws at outboard bearing
cap and tighten up on back-off screws. This will pull
the impeller loose from the shaft. After impeller is
removed, retighten screws to bring bearing cap back
to original position. It will be necessary to readjust the
impeller clearance after impeller is reinstalled.
After impeller is removed, unscrew three or four
stainless steel socket head screws that hold volute
lip plate in place. Tap on plate to loosen and remove
through volute case inlet opening. The inboard seal
now can be removed for inspection by sliding sleeve
from pump shaft. If faces are worn, the seal should
be replaced.
Clean pump casing thoroughly, removing any rust or
dirt from all machined surfaces.
Install lip plate with lip in the one o'clock position. Use
a pipe compound on all machined faces.
The following pertains to the 4" self-priming pump.
Use Permatex®on the three stainless steel screws
that hold volute lip plate in place. Reinstall the lip
plate and tighten the screws. Install seal on shaft and

5
place seal spring in place. Block impeller vane with a
piece of hardwood and screw impeller on by turning
pump shaft clockwise. Use large crescent wrench or
strap wrench on shaft, pulling against key to retighten.
A pipe wrench can be used if care is used not to
damage shaft. Replace impeller lock washer with pin
and stainless lock screw.
The 6" self-priming pump uses a taper fit impeller
shaft. Use Permatex®on the four stainless steel
screws that hold volute lip plate in place. Reinstall the
lip plate and tighten the screws. Install seal on shaft
and place seal spring in place, then install key and
impeller. Caution must be taken to be sure impeller
is seated on the shaft and not on the key. Replace
impeller lock washer and stainless lock bolt.
Replace suction cover with wear plate attached.
Check impeller clearance; adjust if necessary as
described under adjusting instructions. Refill seal
chamber as described under lubricating instructions.
Replacing Inboard Seal:
Use all steps outlined under impeller removal. Slide
seal and shaft sleeve from shaft. It may be necessary
to tap on sleeve with plastic hammer to loosen. After
rotating part of seal is removed, use wire hook and
pull stationary seal seat from casting. Wipe seal
pocket clean, then install new stationary seat. Use PB
Blaster or equivalent on rubber cap and push in place
with fingers, then wipe the seal face clean. Place new
rotating seal part on sleeve and to push sleeve onto
shaft. Be sure O-ring gasket is in place in groove on
pump shaft. Reinstall volute lip plate, put seal spring
in place and install impeller. Install impeller washer,
impeller lock screw or nut, and suction cover. Check
impeller clearance; adjust if necessary as described
under adjusting instructions. Refill seal chamber with
#30 nondetergent automotive oil.
For MSPD Pump Replacing Both Inboard and
Outboard Seals:
When it is necessary to replace both seals, which
will be indicated by water leaking from the seal
chamber, it is recommended that the complete
rotating assembly be removed so that it can be
worked on more easily. Drain pump and seal chamber
as described above. Then loosen or remove the
pump coupling or remove V-belt components, if belt
driven. Remove motor bolts and move motor to one
side. Remove bolts in bearing bracket support foot
and remove four knock-off handles from studs in
rotating unit housing. Tap on housing with hammer
to loosen then pull complete assembly from case.
Remove impeller and lip plate; see Replacing Impeller
and Volute Lip Plate. Remove inboard seal by sliding
sleeve from shaft. Use two screws in tapped holes
of seal plate and pry out plate with pinch bar under
heads of pull bolts. Remove snap ring from shaft
and pull outboard rotating assembly from shaft. Use
wire hooks to pull ceramic stationary seal seat from
housing. It may be necessary to break the ceramic
seal ring. Ceramic ring can be easily broken by
tapping with screwdriver. Ring is broken only if worn
and needs to be replaced.
Wipe housing clean and replace ceramic stationary
ring. Use PB Blaster or equivalent on rubber cap to
push into housing. Push in stationary seal seat with
fingers only, then wipe the seal face clean. Push new
rotating seal part onto shaft. Replace seal spring and
holding washer, then install snap ring.
Replace seal plate. Be sure O-ring is in place and that
flat rubber gasket is in place on backside of seal plate.
Use grease on O-ring and push plate into position in
seal housing. Replace the three socket head stainless
steel screws. Use Permatex®on bolt threads. Replace
new inboard stationary seal face. Now replace rotating
seal part mounted on shaft sleeve. Replace volute
lip plate with the three or four socket head stainless
screws. Use Permatex®on screw threads. Install
seal spring and then screw impeller onto shaft. Lock
impeller on with washer and stainless steel socket
head screw. If shaft has a taper fit, be sure key is in
place and in notch of shaft sleeve. Unit is now ready
to reinstall in casing. Use NEVER-SEEZ®on machine
faces and be sure case O-ring is in place on flange.
Replace nuts and bearing bracket support foot. Reset
motor and connect coupling or reinstall belts if unit is
belt driven. Refill seal chamber with #30 nondetergent
automotive grade oil. Replace top fill plugs.
Replacing Shaft Bearings:
Both bearings are the same size for a given pump.
To replace bearings, remove the impeller, seal plate
and seals as described previously. Drain oil from
the bearing oil cavity. Remove holding screws from
outboard bearing cap and pull shaft and bearing
assembly from housing. It may be necessary to tap on
end of shaft with plastic or rubber hammer to loosen
shaft bearings from housing. After shaft is removed,
take snap ring off end bearing cap and push shaft and
bearing from housing.
Use Arbor press to press bearings from shaft. Always
support or press on inner race of bearing. Never press
on outer race as this can damage the bearing.
Be sure housing and all parts are thoroughly cleaned
before installing new bearings. Use care in pushing
shaft through lip seals that seal shaft in bearing
housing and bearing cap. After shaft is reassembled,
install seals and impeller and adjust clearance of
impellers as described previously.
PUMP LUBRICATING
Pump Bearings Oil Lubricated:
The 4" and 6" self-priming pumps are available only in
an oil bath pump bearing lubrication arrangement. The
same care as described in the maintenance of shaft
seal stated above applies to the bearing lubrication.
Same basic instructions apply to lubricating motor
bearings, but consult motor manufacturer's data on
lubricating bearings. Bearings can run quite hot to

6
the hand without damage to the bearing. Outside
temperature of the housing should not exceed 130°F
for long bearing life.
PUMP SHAFT SEALS
Shaft Seals:
The oil cavity is accessible for filling and draining of
the oil cavity from the exterior of the volute casing.
The oil in the seal chamber should be checked every
six months or every three months if water-containing
abrasives are being pumped. Remove hex head plug
from top of seal chamber and loosen hex plug at
bottom of seal chamber. Place a container under the
lower plug then remove lower plug and allow oil to
drain into container. After all oil is removed, pour used
oil into a glass container so that it can be observed.
If the oil is clean, it will indicate seals are in good
condition. If a small amount of water shows in the oil,
this will also indicate satisfactory seal operation. If
considerable water and some dirt shows in the oil, it
will indicate the inboard seal is worn and should be
replaced before outboard seal is damaged. If seals
are in good order, refill the seal chamber with #30
nondetergent automotive oil. About 2 ½ quarts are
required. Fill with funnel or tube so that the air can
escape. Oil chamber must have a 1" air gap; do not
overfill oil chamber.
PUMP TROUBLESHOOTING
WARNING: If pump has overheated, allow pump to
cool before servicing. Do not remove plates, cover,
gauges or fittings from an overheated pump. Liquid
inside the pump case can reach the boiling point,
and vapor pressure within the pump case may cause
parts to be ejected with great force. Drain pump case
only after pump has been allowed to cool. Use care to
prevent personnel from touching the hot liquid.
Pump will not prime:
1. Pump discharge does not have air bleed line
installed. See pump installation instructions for
air bleed line.
2. Vertical suction lift is too high. Vertical lift for
priming should not be more than 20 feet.
3. Allow sufficient time for priming. On high lifts and
at low pump speeds priming time may take five
minutes or longer.
4. Suction line has an air leak. Install a vacuum
gauge at pump suction flange and start pump.
After a vacuum is established, stop pump and
see if gauge holds. If gauge hand drops, it will
indicate an air leak at some connection below the
gauge tap.
5. Check pump rotation. Pump must turn clockwise
when looking at the power end of pump.
6. Not enough liquid in pump casing. Add water to
the case. Pump needs water in the pump case
to prime.
7. Suction check valve damaged or contaminated.
Replace check valve.
8. Leaking or worn seal or pump gasket. Check
pump case vacuum; replace leaking or worn
seals or gaskets.
Pump primed OK initially but occasionally loses
prime and will not reprime without adding water:
IMPORTANT: Drain pump case and close discharge
gate valve before removing inspection cover.
1. Air bleed line is not installed properly as specified
or is plugged. See installation instructions.
2. Check priming port for plugging. Remove
inspection cover on right side of case when
facing power end of pump. Check priming port
hole in case below inspection plate for plugging.
3. Impeller may be worn, leaving too much
clearance between impeller face and suction
wear plate. Adjust impeller as described under
adjusting instructions. If impeller and volute lip
plate are worn, they must be replaced to regain
original priming efficiency.
Pump makes a loud crackling noise
when operating:
1. If pump has been operating satisfactorily and this
noise suddenly starts, it may indicate that some
large object is lodged in the suction check valve,
suction cover/plate or impeller causing the pump
to be noisy. Remove debris from these areas of
the pump.
2. If noise exists when suction pipe, check valve
and suction cover port are clear, it may indicate
too high a capacity being delivered for a given
suction lift, causing suction cavitation. If pump
is allowed to operate under these conditions,
the impeller will be damaged. Using a smaller
impeller or reducing the pump speed if a belt
drive is used may alleviate the cavitation. Consult
factory for recommendations.
3. If cracking noise is pronounced when pump is
operating at low capacity it may indicate pump is
operating too near the shut-off head. Increasing
the impeller diameter or increasing pump speed
may alleviate this condition. Consult factory
for recommendations.
4. Performance curves show maximum/minimum
capacity that the pump will deliver at a given
condition point and the allowable suction lift
without cavitation. Use vacuum gauge at pump
suction to check total suction lift when pump
is operating. Use discharge pressure gauge at
pump discharge to check discharge head. Total
the two-gauge reading to determine the total
dynamic head the pump must operate against.

7
5. Entrained air may be present and is being
pumped; find source of air and eliminate.
6. Pump or drive not securely mounted. Retighten
all components.
Pump does not deliver rated capacity:
1. Total head may be higher than calculated. Pump
capacity is based on total head. Total dynamic
head is arrived at by adding the suction gauge
reading, in feet, to the discharge gauge reading,
in feet. These readings should be taken at the
suction flange and at the pump discharge flange
connections. Reading should be taken as close
to the flange fittings and pump case as possible.
To convert psi, pressure per square inch, to feet,
multiply the total psi readings by 2.31. This will
equal total dynamic head in feet.
2. Pump impeller may be worn on the vane faces
or the clearance between the impeller and wear
plate may be greater than .015". Adjust impeller
to wear plate clearances for proper clearance
as described under adjusting instructions. If
impeller, suction wear plate and volute lip plate
are badly worn, they must be replaced.
3. Pump speed may be too slow. Check drive
assembly, V-belts or coupling, for slippage.
4. Possible air leak in the suction piping. Eliminate
the leak.
5. Suction head may be too high. Reduce lift by
raising on/off levels in the wet well or reduce
friction losses due to suction piping arrangement.
6. Suction line not submerged at proper levels.
Correct suction pipe submergence.
7. Blockage in the suction pipe or discharge pipe.
Remove blockage. Where the blockage is can be
determined by gauge readings.
8. Impeller clogged; remove debris.
Motor starter overload trips after pump has
operated for a short period:
1. Rags or trash may be caught in the impeller
causing extra load. Remove suction cover/plate
and clean impeller. Pump shaft must turn freely
by hand after cleaning impeller.
2. Overload heater may be too small. Check
heater size with full load amps of motor. See an
electrical table for proper size.
3. Total head may be lower than calculated,
causing extra load on the motor. Reducing
impeller diameter or reducing speed, if belt
driven, will lower motor load. Consult factory
for recommendations.
4. Pump may be pumping a liquid heavier than
water or a liquid with higher viscosity than water,
such as heavy oil. Consult factory for power
required to pump oils or liquids other than water.
5. Bearings may be damaged causing excessive
motor load.
6. Pump speed may be too high. Check drive
output to see if they are sized properly.
Pump clogs frequently:
1. Liquid solution being pumped is too thick. Dilute
if possible.
2. Discharge velocity too slow. Open discharge
valves to fully open; increase pump speed.
Bearing running too hot:
1. Drive misaligned; realign drive.
2. Low or incorrect lubricant. Use proper type and
level of lubricant.

8
Item
Eng.
No.
Part
Description Qty.
1 001210011 Pipe Plug 4
2 001500401 O-ring 2
3 008910042 Wear Plate 1
4 148380002 Suction Cover 1
5 005680041 Impeller Bolt 1
6 010390001 Impeller Washer w/ Pin 1
7 149850001 Pressure Relief Valve 1
8 001770141 Lock Washer 8
9 008520031 Hex Nut 8
10 152381002 Suction Flange 4" NPT 1
11 001500161 O-ring 1
12 001190011 Pipe Plug 1
13 120161001 Gasket 1
14 072610013 Pin – Check Valve 1
15 148890001 Hinge – Hanger 1
16 008930002 Discharge Flange 4" NPT 1
17 009050002 Knock-off Handle 8
18 148600013 Check Valve Cover 1
19* 120180011 Piston Cup – Gasket 1
20* 131230021 Screw – Machine 1
21* 001560191 Washer 1
22* 120120011 Bracket 1
23* 001140021 Hex Nut 1
24* 001560471 Washer 1
25* 009030012 Weight 1
26 148600003 Inspection Cover 1
27 120161011 Gasket 1
28 008880402 Impeller 9-5/32" Dia 1
008880412 Impeller 8-1/2" Dia 1
008880422 Impeller 8" Dia 1
008880432 Impeller 7-1/2" Dia 1
008880442 Impeller 7" Dia 1
29 020050022 Lip Plate, 9-5/32" Imp Dia 1
008920402 Lip Plate, 8-1/2" Imp Dia 1
008920412 Lip Plate, 8" Imp Dia 1
013260402 Lip Plate, 7-1/2" Imp Dia 1
013260412 Lip Plate, 7" Imp Dia 1
30 011300021 Cap Screw 3
31 148320002 Volute 1
32 148570001 Shaft Sleeve 1
33 148590001 Seal (Ceramic), Std 1
148590011 Seal (Carbide), Opt 1
MSP4 / MSPD4 PARTS LIST
Item
Eng.
No.
Part
Description Qty.
34 010900081 Oil Seal 1
35 000650351 Bearing 1
36 001200011 Pipe Plug 2
37 009740031 Retaining Ring 1
38 008520021 Hex Nut (Jam) 3
39 100-012112-273 Bolt 10
40 071670151 Bearing 1
41 008991002 Bearing Cap 1
42 148580001 Pump Shaft 1
43 010900011 Oil Seal 1
44 009750051 Retaining Ring 1
45 001500141 O-ring 1
46 016640071 Pipe Plug 2
47 148310002 Rotating Case 1
48 000790231 O-ring 1
49 001500191 O-ring 1
50 010240031 Stud 4
51 051241002 Seal Plate 1
52 001780011 Cap Screw 3
53 011330011 Gasket-washer 3
54 19101A010 Bolt 2
55 010240021 Stud 8
56 001770081 Lock Washer 2
57 002390061 Bolt 2
58 009450043 Support Foot 1
59 148770002 Bearing Housing 1
60 002390091 Bolt 4
61 008340121 O-ring 1
62 148780002 Seal Housing 1
63 009750261 Retaining Ring 1
64 006260011 O-ring 1
65 010300021 Stud 2
66 05454A011 Lock Washer 2
67 011240031 Nut 2
68 010300031 Stud 2
69 016640011 Pipe Plug 1 or 5
70 001190131 Pipe Plug 2
71* 120120405 Check Valve Assy 1
72 148580021 Shaft 1
73 010240011 Stud 4
74 152380002 Suction Flange 4" 150# 1
75 013080002 Discharge Flange 4" 150# 1
149390001 Sight Glass 1
Notes: *Piece #71, Check Valve Assy, consists of pieces 19, 20, 21, 22, 23, 24 and 25.

9

10
Item
Eng.
No.
Part
Description Qty.
1 001210011 Pipe Plug 4
2 002410291 O-ring 2
3 010240031 Stud 4
4 009050002 Knock-off Handle 10
5 105840011 Impeller Washer w/ Pin 1
6 105250081 Impeller Bolt 1
7 148380012 Suction Cover 1
8 019340062 Wear Plate 1
9 028550011 Key 1
10 023240021 Stud 4
11 001770121 Lock Washer 8
12 023680011 Hex Nut 8
13 072610013 Pin Check Valve 1
14 152391002 Suction Flange 6" NPT 1
15 001500571 O-ring 1
16* 120180041 Piston Cup Gasket 1
17* 001560191 Washer 1
18* 131230031 Screw Machine 1
19* 126090021 Bracket 1
20* 001140021 Hex Nut 1
21* 001560471 Washer 1
22* 126100021 Weight 1
23 001190011 Pipe Plug 1
24 148890011 Hanger Hinge - Check Valve 1
25 148600023 Check Valve Cover 1
26 120161021 Gasket 1
27 010240011 Stud 6
28 148650002 Discharge Flange 6" NPT 1
29 001500191 O-ring 1
30 148600003 Inspection Cover 1
31 120161011 Gasket 1
32 011300021 Cap Screw 4
33 001500081 O-ring 1
34 148320012 Volute 1
35 037180001 Seal (Ceramic), Std 1
037180011 Seal (Carbide), Opt 1
36 023100023 Shaft Sleeve 1
37 000650371 Bearing 1
38 001200011 Pipe Plug 2
39 001500181 O-ring 1
40 011240021 Hex Nut (Jam) 3
MSP6 / MSPD6 PARTS LIST
Item
Eng.
No.
Part
Description Qty.
41 005700051 Cap Screw 6
42 071670161 Bearing 1
43 010900021 Oil Seal 1
44 148580011 Shaft Pump 1
45 019401002 Bearing Cap 1
46 149110011 Retaining Ring 1
47 000641001 Spring Washer 1
48 149100011 Retaining Ring 1
49 016640011 Pipe Plug 1 or 3
50 148310012 Rotating Unit 1
51 019380042 Seal Plate 1
52 005560061 Cap Screw 3
53 011330021 Gasket 3
54 002410161 O-ring 1
55 042432102 Lip Plate, 12-7/8" Imp Dia 1
042432012 Lip Plate, 12" Imp Dia 1
042432022 Lip Plate, 11-1/2" Imp Dia 1
042432032 Lip Plate, 11" Imp Dia 1
042432042 Lip Plate, 10-1/2" Imp Dia 1
042432052 Lip Plate, 10" Imp Dia 1
56 023042002 Impeller 12-7/8" Dia 1
023042012 Impeller 12" Dia 1
023042022 Impeller 11-1/2" Dia 1
023042032 Impeller 11" Dia 1
023042042 Impeller 10-1/2" Dia 1
023042052 Impeller 10" Dia 1
57 002390051 Cap Screw 4
58 001770181 Lock Washer 4
59 010900031 Oil Seal 1
60 010240021 Stud 4
61 008340201 O-ring 2
62 002390091 Bolt 4
63 148770012 Bearing Housing 1
64 009750101 Retaining Ring 1
65 148780012 Seal Housing 1
66 100-012112-273 Bolt 4
67 016640071 Pipe Plug 1 or 4
68 148580031 Shaft 1
69 001190131 Pipe Plug 2
70 009750111 Retaining Ring 1
71 001770141 Lock Washer 4
72 008520031 Nut 4
73 023240051 Stud 4
74 149850001 Pressure Relief Valve 1
75 010240041 Stud 4
76 152390002 Suction Flange 6" 150# 1
77* 126120615 Check Valve Assy 1
78 152390012 Discharge Flange 6" 150# 1
Notes: *Piece #77, Check Valve Assy, consists of
pieces 16, 17, 18, 19, 20, 21 and 22

11
6

Warranty Rev. 12/13
STANDARD LIMITED WARRANTY
Pentair Myers® warrants its products against defects in material and workmanship for a period of 12 months from the
date of shipment from Pentair Myers or 18 months from the manufacturing date, whichever occurs first – provided
that such products are used in compliance with the requirements of the Pentair Myers catalog and technical manuals
for use in pumping raw sewage, municipal wastewater or similar, abrasive-free, noncorrosive liquids.
During the warranty period and subject to the conditions set forth, Pentair Myers, at its discretion, will repair or
replace to the original user, the parts that prove defective in materials and workmanship. Pentair Myers reserves the
right to change or improve its products or any portions thereof without being obligated to provide such a change or
improvement for prior sold and/or shipped units.
Start-up reports and electrical schematics may be required to support warranty claims. Submit at the time of start-
up through the Pentair Myers website: http://forms.pentairliterature.com/startupform/startupform.asp?type=m.
Warranty is effective only if Pentair Myers authorized control panels are used. All seal fail and heat sensing devices
must be hooked up, functional and monitored or this warranty will be void. Pentair Myers will cover only the lower
seal and labor thereof for all dual seal pumps. Under no circumstance will Pentair Myers be responsible for the cost
of field labor, travel expenses, rented equipment, removal/reinstallation costs or freight expenses to and from the
factory or an authorized Pentair Myers service facility.
This limited warranty will not apply: (a) to defects or malfunctions resulting from failure to properly install, operate or
maintain the unit in accordance with the printed instructions provided; (b) to failures resulting from abuse, accident
or negligence; (c) to normal maintenance services and parts used in connection with such service; (d) to units that
are not installed in accordance with applicable local codes, ordinances and good trade practices; (e) if the unit is
moved from its original installation location; (f) if unit is used for purposes other than for what it is designed and
manufactured; (g) to any unit that has been repaired or altered by anyone other than Pentair Myers or an authorized
Pentair Myers service provider; (h) to any unit that has been repaired using non factory specified/OEM parts.
Warranty Exclusions: PENTAIR MYERS MAKES NO EXPRESS OR IMPLIED WARRANTIES THAT EXTEND BEYOND
THE DESCRIPTION ON THE FACE HEREOF. PENTAIR MYERS SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE.
Liability Limitation: IN NO EVENT SHALL PENTAIR MYERS BE LIABLE OR RESPONSIBLE FOR CONSEQUENTIAL,
INCIDENTAL OR SPECIAL DAMAGES RESULTING FROM OR RELATED IN ANY MANNER TO ANY PENTAIR MYERS
PRODUCT OR PARTS THEREOF. PERSONAL INJURY AND/OR PROPERTY DAMAGE MAY RESULT FROM IMPROPER
INSTALLATION. PENTAIR MYERS DISCLAIMS ALL LIABILITY, INCLUDING LIABILITY UNDER THIS WARRANTY, FOR
IMPROPER INSTALLATION. PENTAIR MYERS RECOMMENDS INSTALLATION BY PROFESSIONALS.
Some states do not permit some or all of the above warranty limitations or the exclusion or limitation of incidental or
consequential damages and therefore such limitations may not apply to you. No warranties or representations at any
time made by any representatives of Pentair Myers shall vary or expand the provision hereof.
1101 MYERS PARKWAY 490 PINEBUSH ROAD, UNIT 4
ASHLAND, OHIO 44805 CAMBRIDGE, ONTARIO, CANADA N1T 0A5
PH: 855-274-8947 PH: 800-363-7867
WWW.FEMYERS.COM WWW.FEMYERS.COM