Power-flo PF4NC Series Guide

877-24PUMPS • www.poweropumps.com ISP No: PF4NC ISP - 1/2021
INSTALLATION, SERVICE & PARTS MANUAL
Series: PF4NC
4.5 - 15 HP • 1750 RPM • 60 Hz
Submersible Non-Clog Pumps

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
PF4NC Submersible Non-Clog Pumps
General Safety Information
® Power-Flo is a registered trademark of Power-Flo Technologies Inc. Other brand and product names are trademarks or registered trademarks of
their respective holders. Alteration Rights Reserved. 12/2007, 8/08, 6/09, 8/09, 9/09, 4/10, 2/11, 5/11, 8/12, 6/13, 8/17,9/20, 1/2021
Before installation, read the following
instructions carefully. Failure to follow
instruction and Safety information could
cause serious bodily injury, death and/or
property damage. Each Power-Flo pump is
individually factory tested to insure proper
performance. Closely following these
instructions will eliminate potential operating
problems, assuring years of trouble-free
service.
“Danger” indicates
an imminenty
hazardous situation which, if not avoided,
WILL result in death or serious injury.
“Warning” indicates
an imminenty
hazardous situation which, if not avoided,
MAY result in death or serious injury.
“Caution” indicates
an potentially
hazardous situation which, if not avoided,
MAY result in minor or moderate injury.
IMPORTANT - Power-Flo Pumps and
Systems is not responsible for losses, injury
or death resulting from failure to observe
these safety precautions, misuse, abuse or
misapplication of pumps or equipment.
ALL RETURNED
PRODUCTS MUST BE
CLEANED, SANITIZED,
OR RECONTAMINATED
PRIOR TO SHIPMENT, TO
INSURE EMPLOYEES WILL NOT BE EXPOSED
TO HEALTH HAZARDS IN HANDLING SAID
MATERIAL. ALL APPLICABLE LAWS AND
REGULATIONS SHALL APPLY.
Installation, wiring,
and junction
connections must be in accordance with
the National Electric Code and all applicable
state and local codes. Requirements may
vary depending on usage and location.
Installation and
servicing is to be
conducted by qualied personnel only.
Keep clear of suction
and discharge
openings. Do not insert ngers in
pump with power connected.
Always wear eye
protection when
working on pumps. Do not wear loose
clothing that may become entangled in
moving parts
Pumps build up heat
and pressure during
operation. Allow time
for pumps to cool
before handling or
servicing.
This pump is not
intended for use
in swimming pools or water
installations where human
contact with pumped uid.
Risk of electric shock.
To reduce risk of
electric shock, always disconnect
pump from power source before
handling. Lock out power & tag.
Do not us these
pumps in water
over 104˚F. Do not exceed manufactures
recommended maximum performance, as
this could cause the motor to overheat.
Do not lift, carry or
hang pump by the
electrical cables. Damage to the
electrical cables can cause shock,
burnes or death. Never handle
connected power cords with wet hands. Use
appropriate lifting device.
Sump and sewage
pumps often handle
materials which could cause illness or disease.
wear adequate protective clothing when
working on a used pump or piping. Never
enter a basin after it has been used.
Failure to permanently
ground the pump,
motor and controls before
connecting to power can cause
shock, burns or death.
These pumps are NOT
to be installed in
locations classied as hazardous in
accordance with the National
Electric Code, ANSI/NFPA 70.
IMPORTANT!
Prior to installation, record Model
Number, MFG Date, Amps, Voltage, Phase
and HP, from pump name plate for future
reference. Also record the Voltage and
Current Readings at Startup:
1 Phase Models
Amps: Volts:
3 Phase Models
Amps L1-2: Volts L1-2:
Amps L2-3: Volts L2-3:
Amps L3-1: Volts L3-1:
Model Number: ____________________
MFG Date: ____________
PHASE: ______ HP: _________________
WARNING:
CANCER AND REPRODUCTIVE HARM-
WWW.P65WARNINGS.CA.GOV

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Specications
PF4NC Submersible Non-Clog Pumps
Description
Submersible non-clog sewage pump designed
for typical raw sewage applications.
Series: PF4NC
4.5, 7.5, 11.3, 15HP,
1750RPM, 60Hz
Submersible Non-Clog
DISCHARGE 4” 125 lb., ANSI Flange Horizontal
LIQUID TEMPERATURE 104°F Continuous
MOTOR HOUSING Cast Iron, Class 30
VOLUTE Cast Iron, Class 30
IMPELLER
2 vane open type with pump out vanes on back
side, Dynamically balanced, ISO G6.3, Cast Iron,
Class 30
SOLIDS HANDLING 3” spherical
SHAFT 416 Stainless steel
SEALPLATE Cast Iron, Class 30
SQUARE RINGS Buna-N
HARDWARE 316 Stainless steel
PAINT Air dry enamel
SEAL
Double mechanical, 1.25”, Type “K”, U.S. Seal, Oil
Filled pressure equalized reservoir,
Carbon/Ceramic/Buna-N, inner
Silicon Carbide/ Buna-N, outer seal
UPPER BEARING Single row, ball, oil lubricated
LOWER BEARING Double row, ball, oil lubricated
POWER CORD
25 Ft. Cord. Epoxy sealed housing with
secondary Pressure grommet for sealing and
strain relief.
MOTOR Class F Insulation, Oil Filled
SINGLE PHASE
Capacitor Start/Capacitor Run.
Requires Starter/Panel which includes
capacitors and overload protection.
THREE PHASE 230/460 Volt. Dual Voltage.Requires overload
protection to be included in control panel.
MOISTURE SENSOR Normally open (N/O),
requires relay in control panel
TEMPERATURE
SENSOR
Normally closed (N/C),
requires relay in control panel

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PF4NC Submersible Non-Clog Pumps
Specications & Dimensions
MODEL HP Volt/PH Hz RPM
(Nom)
NEMA
Start
Code
Full Load
Amps
Locked
Rotor Amps Cord Size Cord Type Cord O.D inch
PF4NC4524* 4.5 230/1 60 1750 A 26.0 59.0 10/4 SOW 0.78
PF4NC4534 4.5 230/3 60 1750 E 17.6 56.0 10/4 SOW 0.78
PF4NC4544 4.5 460/3 60 1750 E 8.8 28.0 10/4 SOW 0.78
PF4NC4564 4.5 208/3 60 1750 C 20.9 48.6 10/4 SOW 0.78
PF4NC7524* 7.5 230/1 60 1750 A 39.0 96.0 10/4 SOW 0.78
PF4NC7534 7.5 230/3 60 1750 D 23.6 80.0 10/4 SOW 0.78
PF4NC7544 7.5 460/3 60 1750 D 13.4 40.0 10/4 SOW 0.78
PF4NC7564 7.5 208/3 60 1750 B30.8 69.5 10/4 SOW 0.78
PF4NC11334 11.3 230/3 60 1750 D 28.4 126.0 10/4 SOW 0.78
PF4NC11344 11.3 460/3 60 1750 D 14.2 63.0 10/4 SOW 0.78
PF4NC11364 11.3 208/3 60 1750 B32.2 109.5 10/4 SOW 0.78
PF4NC15034 15 230/3 60 1750 D 40.0 160.0 10/4 SOW 0.78
PF4NC15044 15 460/3 60 1750 D 20.0 80.0 10/4 SOW 0.78
MODELS START RELAY START CAPACITOR RUN CAPACITOR
PF4NC4524 & PF4NC7524 MARS 64 233-280 mfd - 250 volt, MARS 11053 60 mfd - 370 volt, MARS 12087
Winding resistance ± 5% at terminal block. Rated operation at ± 10% voltage at motor.
Moisture/Temperature sensor cable for all models is 18/5 SOW, 0.476 inch O.D.
(*)IMPORTANT! - These pumps require a control panel with start, run capacitors and
relay. Capacitor kits which include Start & Run capacitors and start relay, are available if
a Power-Flo control panel is not used. See page 14.

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Performance
PF4NC Submersible Non-Clog Pumps

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Receiving Inspection
Upon receiving the pump, it should be
inspected for damage or shortages.
If damage has occurred, le a claim
immediately with the company that
delivered the pump. If the manual is
removed from the packaging, do not
lose or misplace.
Storage
Any product that is stored for a period
longer than six (6) months from the
date of purchase should be bench
tested prior to installation. A bench
test consists of, checking the impeller
to assure it is free turning and a run
test to assure the motor (and switch
if provided) operate properly. Do not
pump out of liquid.
Controls
Manual models require a separate
approved pump control device or panel
for automatic operation. Be sure the
electrical specication of the control
selected properly match the electrical
specications of the pump.
Submergence
The pump should always be operated in
the submerged condition. The minimum
sump liquid level should never be less than
above the pump’s volute (See Figure 1).
Installation
These pumps are recommended for
use in a sump, basin or lift station.
The sump, basin or lift station shall be
sealed and vented in accordance with
local plumbing codes. This pump is
designed to pump sewage, euent
or wastewater, nonexplosive and
noncorrosive liquids and shall NOT
be installed in locations classied as
hazardous in accordance with the
National Electrical Code (NEC) ANSI/
NFPA 70 or Canadian Electric Code
(CEC). The pump should never be
installed in a trench, ditch, or hole with
a dirt bottom. The legs will sink into
the dirt and the suction will become
plugged.
The installation should be at a sucient
depth to ensure that all plumbing is
below the frost line. If this is not feasible,
remove the check valve and size the
basin to accommodate the additional
backow volume.
Pumps are most commonly installed
in simplex, duplex or triplex stations or
basins with a slide rail system, which
allows the pump(s) to be installed or
removed without requiring personnel to
enter the station, or resting on the basin
oor.
Discharge Piping
Discharge piping should be as short as
possible and sized no smaller than the
pump discharge. Do not reduce the
discharge pipe size below that which
is provided on the pump.
Both a check valve and a shut-o valve
are recommended for each pump. The
check valve is used to prevent backow
into the sump. The shut-o valve is used
to manually stop system ow during
pump servicing.
Liquid Level Controls
The level control(s) should be mounted
on the discharge piping, a cable rack or
oat pole. The level control should have
adequate clearance so it cannot hang
up in it’s swing and that the pump is
completely submerged when the level
control is in the “O” mode. By adjusting
the cord tether the control level can be
changed. One cycle of operation should
be observed, so that any potential
problems can be corrected.
It is recommended that the level control
oat should be set to insure that the
liquid in the sump never drops below the
top of the motor housing or a minimum
level of 10 inches above the basin oor.
Electrical Connections
Power/control cables:
The power/control cables mounted to
the pump must not be modied in any
way except for shortening to a specic
application. Any splice between the
pump and the control panel must be
made in accordance with the electric
codes. It is recommended that a junction
box, if used, be mounted outside the
sump or be of at a minimum Nema
4 construction if located within the
wet well. DO NOT USE THE POWER/
CONTROL CABLES TO LIFT PUMP.
Always rely upon a Certied Electrician
for installation.
Receiving & Installation
PF4NC Submersible Non-Clog Pumps
Bottom of Feet
12”
Recommended
Submergence Level
Minimum
Submergence Level
Figure 1
15.13”

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Overload Protection:
Single Phase - The stator in-winding
overload protector used is referred to
as an inherent overheating protector
and operates on the combined eect
of temperature and current. This means
that the overload protector will trip out
and shut the pump o if the windings
become too hot, or the load current
passing through them becomes too high.
IMPORTANT ! - The overload will then
automatically reset and start the pump
up after the motor cools to a safe
temperature. In the event of an overload,
the source of this condition should be
determined and corrected immediately.
WARNING! - DO NOT LET
THE PUMP CYCLE OR RUN IF
AN OVERLOAD CONDITION
OCCURS !
Three Phase - The Normally Closed
(N/C) thermal sensor is embedded in the
motor windings and will detect excessive
heat in the event an overload condition
occurs. The thermal sensor will trip when
the windings become too hot and will
automatically reset when the pump
motor cools to a safe temperature. It is
recommended that the thermal sensor
be connected in series to an alarm device
to alert the operator of an overload
condition, and/or the motor starter coil
to stop the pump. In the event of an
overload, the source of this condition
should be determined and repaired. DO
NOT LET THE PUMP CYCLE OR RUN IF
AN OVERLOAD CONDITION OCCURS!
Moisture Sensors - A normally open
(N/O) sensor rated of 1 watt @330K
ohms, 500 volt, is installed in the pump
seal chamber which will detect any
moisture present. It is recommended
that this detector be wired in series to
an alarm device or motor starter coil to
alert the operator that a moisture detect
has occurred. In the event of a moisture
detect, check the individual moisture
sensor probe leads for continuity, (∞
resistance = no moisture) and the
junction box/control box for moisture
content. These situations may induce
a false signal in the moisture detecting
circuit. If none of the above test prove
conclusive, the pump(s) should be pulled
and the source of the failure repaired. IF
A MOISTURE DETECT HAS OCCURRED
MAINTENANCE SHOULD BE
PERFORMED AS SOON AS POSSIBLE!
If current through the temperature sensor
exceeds the values listed, an intermediate
control circuit relay must be used to
reduce the current or the sensor will not
work properly.
TEMPERATURE SENSOR ELECTRICAL
RATINGS
Volts Continuous
Amperes
Inrush
Amperes
110-120 3.00 30.0
220-240 1.50 15.0
440-480 0.75 7.5
600 0.60 6.0
Wire Size:
If longer power cable is required consult
a qualied electrician for proper wire
size.
Pre-Operation
1. Check Voltage and Phase - Compare
the voltage and phase information
stamped on the pump name plate.
2. Check Pump Rotation - Improper
motor rotation can result in poor
pump performance and can damage
the motor and/or pump. Check
rotation on three phase units by
momentarily applying power and
observe the “kickback”.
“Kickback” should always be in a
counter-clockwise direction as
viewed from motor end or opposite
to impeller rotation. Incorrect rotation
for Single-Phase pumps is unlikely.
If the rotation is incorrect contact
factory.
3. Name Plate - Record the information
from the pump name plate to
drawing in front of manual for future
reference.
4. Insulation Test - An insulation
(megger) test should be performed
on the motor. Before the pump is put
into service. The resistance values
(ohms) as well as the voltage (volts)
and current (amps) should be
recorded.
5. Pump-Down Test - Be sure pump
has been properly wired, lowered into
the basin, sump or lift station, check
the system by lling with liquid and
allowing the pump to operate through
its pumping cycle. The time needed to
empty the system, or pump-down
time along with the volume of water,
should be recorded.
Installation & Service
PF4NC Submersible Non-Clog Pumps

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Maintenance
No lubrication or maintenance is required.
Perform the following checks when pump
is removed from operation or when pump
performance deteriorates:
a). Inspect motor and seal chambers for
oil level and contamination.
b). Inspect impeller and body for
excessive build-up or clogging.
c). Inspect motor, bearings and replace
if required.
d.) Inspect seal for wear or leakage,
replace if required.
Servicing
Reference Figures 6 .
Cooling Oil - Anytime the pump is
removed from operation, the cooling oil
in the motor housing should be checked
visually for oil level and contamination.
To check oil, set unit upright. Remove
cap screws (6), lift conduit box assembly
(4) from motor housing (3), Do Not
disconnect wiring from motor leads. With
a ashlight, visually inspect the oil in the
motor housing (3) to make sure it is clean
and clear, light amber in color and free
from suspended particles. Milky white oil
indicates the presence of water. Oil level
should be just above the motor when
pump is in vertical position.
Seal Chamber - Drain oil from seal
chamber by placing pump on its side
with pipe plug (18) downward and
remove pipe plug (18). If the oil is found
to contain considerable water or other
contamination, the shaft seal (19) should
be inspected and replaced if required.
Oil Testing
• Drain oil into a clean, dry container by
placing pump on it’s side, remove cap
screws (6), lift conduit box assembly
(4) from motor housing (3). In sepatate
container drain seal chamber by
removing pipe plug (18).
• Check oil for contamination using an
oil tester with a range to 30 Kilovolts
breakdown.
• If oil is found to be clean and
uncontaminated (measuring above
15 KV. breakdown), rell the housing.
• If oil is found to be dirty or contaminated
(or measures below 15 KV. breakdown),
the pump must be carefully inspected
for leaks at the shaft seal, conduit box,
o-rings, pipe plug and pressure valve,
before relling with oil. To locate the
leak, perform a pressure test.
After leak is repaired, dispose of old oil
properly, and rell with new oil.
Pressure builds up extremely
fast, increase pressure by
“TAPPING” air nozzle. Too much
pressure will damage seal. DO
NOT exceed 10 P.S.I. in motor
housing and 20-25 P.S.I. in seal
chamber
Pressure Test
Motor Housing - Oil should be at normal
level. Remove pressure valve (10) from
motor housing (3). Apply pipe sealant
to pressure gauge assembly and tighten
into hole (See Figure 2). Pressurize motor
housing to 10 P.S.I. Use soap solution
around the sealed areas above the oil
level and inspect joints for “air bubbles”.
If, after ve minutes, the pressure is still
holding constant, and no “bubbles” /oil
seepage is observed, slowly bleed the
pressure and remove the gauge assembly.
Replace oil. Leek must be located and
repaired if pressure does not hold.
Seal Chamber - Check that seal chamber
is full of oil by removing pipe plug (18).
Apply pipe sealant to pressure gauge
assembly and tighten into hole in bearing
bracket (16). Pressurize seal chamber to
20-25 PSI and check for leaks.
Oil Replacement - Set unit upright and
rell with new cooling oil as per table.
Fill to just above motor as an air space
must remain in the top of the housing to
compensate for oil expansion. Reassemble
the o-ring (5) and conduit box (4) to
motor housing (3). Apply thread locking
compound to cap screws (6) and place into
holes and torque to 15 ft/lbs.
DO NOT overfill oil. Overfilling
of housing with oil can create
excessive and dangerous hydraulic
pressure which can destroy the
pump and create a hazard.
Overfilling oil voids warranty.
Oil Replacement: Seal Chamber - Rell
chamber completely full with new cooling
oil or reuse the uncontaminated oil.
Figure 2
Service
PF4NC Submersible Non-Clog Pumps

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Cooling Oil
Recommended Supplier/Grade
BP Enerpar SE100
Conoco Pale Parafn 22
Mobile D.T.E. Oil Light
Shell Canada Transformer-10
Texaco Diala-Oil-AX
Disassembly
Impeller & Volute - Disconnect power.
Remove hex nuts (24) and vertically lift
motor housing and seal plate assembly
from volute (31). Clean out volute (31)
if necessary. Inspect gasket (30) and
replace if cut or damaged. Clean and
examine impeller (27), for pitting or
wear and replace if required. To remove
impeller (27), remove cap screw (29) and
washer (28). With a wheel puller, pull
impeller straight o shaft and remove
square key (13).
Moisture Probes - Drain oil from seal
chamber, if not already done. Remove
cap screws (9) and lifting handle (8). Set
unit upside down on blocks to avoid
damaging cables. Remove socket head
cap screws (22) and lift seal plate (20),
with seal’s (19) stationary, vertically from
bearing bracket (16), do not damage
seal. Check moisture sensor probes (35)
for damage, replace by removing screws
(38) and disconnecting wires (34). Then
remove probes (35) from bearing bracket
(16).
Diaphragm - with seal plate (20)
removed, examine diaphragm (21) for
ruptures or crackes. Replace diaphragm
by removing capscrews (41) and plate
(40). Clean vent holes in seal plate (20).
Shaft Seal - Remove outboard rotating
member of seal (19), spring and inboard
rotating member from shaft. Examine all
seal parts.
Inspect seal for signs of uneven wear
pattern on stationary members, chips
and scratches on either seal face. DO
NOT interchange seal components,
replace the entire shaft seal (19). If
replacing seal, remove stationary by
prying out with at screwdrive.
Motor and Bearings - Remove volute,
impeller, seal plate and seal as previously
stated and drain oil from motor housing
(3). Position unit upright, using blocks
to avoid resting unit on shaft. Remove
cap screws (6) o-ring (5) and conduit box
assembly (4) from motor housing (3). Note
connections and then remove cable lead
wires from motor lead wires and moisture
& temperature sensor wires from control
cable by removing connectors. Remove
cap screws (12) and vertically lift the
motor housing (3) from bearing bracket
(16). Replace square ring (15) if damaged
or cut. Remove the upper motor bolts and
lift upper end bell from motor (1). Remove
wave washer. Remove upper bearing (2)
with a wheel puller if damaged or worn.
Vertically lift stator (1) from rotor/shaft.
Inspect windings for shorts and resistance.
Test the temperature sensors by checking
for continuity between the black and
white wires. If defective contact factory
or motor service station. Pull motor rotor/
shaft with bearing (14) from bearing
bracket (16). Remove bearing (14) with a
wheel puller if worn or damaged. If rotor
or stator windings are defective, replace
the complete motor.
IMPORTANT! - All parts must be
clean before reassembly.
Reassembly
Bearings - Replace bearings, being
careful not to damage the rotor or shaft. If
equipped, ll notch should face the rotor
core for both upper and lower bearings.
Apply adhesive compound to the shaft
and press bearing (14) onto shaft, position
squarely onto the shaft applying force
to the inner race of bearing only, until
bearing seats on shoulder of the shaft.
In the same manner, assemble upper
bearing (2) to shaft.
Motor - Slide rotor with bearing (14) into
bearing bracket (16) until bearing seats on
the bottom. Position motor housing and
stator into pilot, install wave washers in
upper end bell.
IMPORTANT! Special wave washers in
upper motor housing are required to
compensate for shaft expansion. These
washers must be properly reinstalled to
give the required constant down force on
the motor shaft.
Position upper motor end bell aligning
holes and thread cap screws into bearing
bracket (16) and torque to 16 ft./lbs.
Place all motor leads above the motor.
Position square ring (15) on bearing
bracket (16) and lower housing (3) over
motor and into pilot, aligning handle so
that it is parallel to motor end bell reliefs.
Apply thread locking compound to
threads on cap screws (12) and place into
holes and torque to 24 ft./lbs.
Handle seal parts with extreme
care. DO NOT damage lapped
surfaces.
Seal/Diaphragm - (See Figure 3) Clean
and oil seal cavities in bearing bracket
(16) and seal Plate (20). Lightly oil (Do
not use grease) outer surface of inboard
and outboard stationary members of seal
(19). Press inboard stationary member
rmly into bearing bracket (16) and
outboard stationary into seal plate (20),
using a seal pusher tool. Nothing but the
seal pusher tool is to come in contact
with seal face.
Service
PF4NC Submersible Non-Clog Pumps

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IMPORTANT! Hammering
on the seal pusher tool will
damage the seal face.
Be sure the stationary members are in
straight and that the rubber ring is not
out of it’s groove. Lightly oil (Do not use
grease) shaft and inner surface of bellows
on rotating member. With lapped surface
facing bearing bracket (16), slide rotating
member onto shaft using seal pusher
tool, until lapped faces are together. It is
extremely important to keep seal faces
clean during assembly. Dirt particales
lodged between faces will cause the seal
to leak.
Be sure driving lugs in retainer are
matched in rotating member of seal (19).
Place spring over shaft and in place on
rotating member, making sure it is seated
in retainer and not cocked or resting on
bellows tail. Lightly oil shaft and inner
surface of outboard rotating member.
With tail section toward bearing bracket
(16), slide rotating member onto shaft
with seal pusher tool until retainer
engages spring and spring is compressed
slightly. Spring should be properly
engaged in both retainers.
Reassemble the diaphragm (21) with
“bulg” facing seal plate (20). Place plate
(40) on diaphragm (21) and insert
capscrews (41) into plate and tighten.
Place seal plate (20) over shaft onto
bearing bracket (16), being careful not
to damage outboard stationary member
and align holes for cap screws (22).
Thread cap screws (22) into bearing
bracket (16) and tighten. Rell chamber
with oil.
Conduit Box Assembly - Check power
(32) and control (33) cables for crackes or
damage and replace complete conduit
box (4) if required. (See Figure 4) Bring
motor wires through opening in top of
motor housing (3), check sleeving and
replace if damaged. Position square ring
(5) in conduit box (4) and reconnect leads
using connectors and insulators. See
Figures 5, for wiring schematics.
Rell with cooling oil. Position conduit
box (4) with square ring (5) on motor
housing. Apply thread locking
compound to cap screws (6) threads and
torque to 16 ft./lbs.
Service
PF4NC Submersible Non-Clog Pumps
Figure 3
Figure 4

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Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Service
Remove gland nuts (32B) & (33B), friction
rings (32C) & (33C), and grommets (32D)
& (33D) from conduit box (4), inspect
and replace if damaged (See Figure 4).
Reassemble by inserting one friction
ring, grommet, one more friction ring
and gland nut into conduit box. Torque
gland nuts to 15 ft./lbs. to prevent
leakage.
Impeller & Volute - Install impeller
(27) by appling a thin lm of oil to
motor shaft and slide impeller straight
onto shaft, keeping keyways lined
up. Drive key (13) into keyway. Locate
washer, apply thread lock primer
(such as Loctite® Primer T), let set per
manufactures’ directions. Apply thread
locking compound to threads on cap
screw (29), and thread into shaft and
torque to 35 ft./lbs.
Place gasket (30) on volute and install
impeller and motor assembly over studs
and onto volute (31). Apply thread
locking compound to threads of studs
(23) and thread nuts (24) onto studs and
torque to 24 ft./lbs. Check for binding
by rotating impeller. Clearance between
the impeller and volute should be
approximately 0.012 inch.
SINGLE PHASE 230 VOLT AC
Capacitor/Relay Pack For Control Panels
P/N: PF73301 For PF4NC4524 &
PF4NC7524
SINGLE PHASE 230 VOLT AC
Power Cable Motor Lead Number
Green (Ground) Green
Black 1 - Run (Main)
Red 2 - Start
White 3 - Common
THREE PHASE 460 VOLT AC
Power Cable Motor Lead Number
Green (Ground) Green
Black 1
Red 2
White 3
T4 & T7 Together
T5 & T8 Together
T6 & T9 Together
THREE PHASE 208-230 VOLT AC
Power Cable Motor Lead Number
Green (Ground) Green
Black 1 & 7
Red 2 & 8
White 3 & 9
T4, T5 & T6 Together
MOISTURE & TEMPERATURE SENSORS
Control Cable Lead Number
Green (Ground) Green
Black P1 (Temp Sensor)
White P2 (Temp Sensor)
Red W1 (Moisture Sensor)
Orange W2 (Moisture Sensor)
Figures 5
PF4NC Submersible Non-Clog Pumps

12
Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Repair Parts For Repair Part Please supply: Model Number and MFG Date as shown on
Name Plate, and Part Description and Part Number as shown on Parts List.
Figure 6
PF4NC Submersible Non-Clog Pumps

13
Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
Ref. No. Qty Name Used On Part Number
11 Motor:
PF4NC4524 - 1 Ph, 230 PF40040025
PF4NC4534, 44 - 3 Ph, 208-230/460 PF40040021
PF4NC7524 - 1 Ph, 230 PF40040026
PF4NC7534, 44 - 3 Ph, 208-230/460 PF40040022
PF4NC11334, 44 - 3 Ph, 208-230/460 PF40040023
PF4NC15034, 44 - 3 Ph, 208-230/460 PF40040024
21 Bearing (upper) PF31020012
3 1 Motor Housing PF03100003
41 Conduit Box PF03100004
51 Square ring PF92010085
64Cap Screw 3/8-16 x 1” Lg., Stainless 
78Wire Connector 230 Volt PF94010012
11 460 Volt
81 Lifting Handle PF30400844
92Cap Screw 1/2-13 x 1-1/4” Lg., Stainless 
10 1 Pressure Relief Valve PF31200021
11 1 Elbow PF93010011
12 6 Cap Screw 3/8-16 x 2” Lg., Stainless 
13 1 Key PF30400633
14 1 Bearing (Lower) PF31020011
15 ◊1 Square Ring Gasket PF92010052
16 1 Bearing Housing PF03040008
17 1 Pipe 3/8” x 3” PF93010066
18 1 Pipe Plug 3/8” PF93010121
19 ◊1 Mechanical Seal, 1.25” C/C/B inner & S/S/B outer PF31030148
20 1 Seal Plate PF03180013
21 ◊1 Diapragm PF31040001
22 2Socket Hd Screw, 1/4-20UNC x 1” Lg., Stainless 
23 6 Studs 3/8-16 x 2” Lg., Stainless 
24 12 Hex Nuts 3/8-16 
25 2Shim washer 0.010” PF91010121
26 2Shim washer 0.030” PF91010130
27 1 Impeller
Std for 4.5HP, 6.50” Dia PF03140030C
Std for 7.5HP, 7.00” Dia PF03140030D
7.12” Dia PF03140030
7.75” Dia PF03140030B
Std for 11.3HP, 8.00” Dia PF03140038E
8.31” Dia PF03140038
Std for 15HP, 8.50” Dia PF03140038F
9.00” Dia PF03140038B
Parts List
For Repair Part Please supply: Model Number and MFG Date as shown on
Name Plate, and Part Description and Part Number as shown on Parts List.
PF4NC Submersible Non-Clog Pumps
 = Aquire standard hardware locally.
◊ = Seal/Gasket Kit
 = Overhaul Kit
 = Supplied as individual items
■ = Seal Probe Kit

14
Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
PF4NC Submersible Non-Clog Pumps
Parts List For Repair Part Please supply: Model Number and MFG Date as shown on
Name Plate, and Part Description and Part Number as shown on Parts List.
Ref. No. Qty Name Used On Part Number
28 1 Impeller Lockwasher PF30400413
29 1 Hex Hd Screw 1/2-13 x 1-1/4” Lg., Stainless PF91010350
30 ◊1 Volute Gasket PF92010084
31 1 Volute PF03090035
1 Conduit Box & Cable Assembly, Includes: 5, 32, 32B, 32C, 32D, 33, 33B, 33C, 33D PF072448
32 1 Power Cable 25 Ft. 10/4 SOW PF31030003
32B 1 Hex Hd Plug 10/4 SOW PF30400903
32C 2Washer 10/4 SOW PF91010055
32D 1 Grommet 10/4 SOW PF92010001
33 1 Moist & Temp Cord Set 25 Ft. 18/5 SOW PF31030005
33B 1 Hex Hd Plug 18/5 SOW PF30400901
33C 2Washer 18/5 SOW PF91010057
33D 1 Grommet 18/5 SOW PF92010005
34 ■2Wire Assy. (Moisture Sensor) PF31030011
35 ■2Moisture Sensor PF31160001
36 ■2Machine Screw 6-32 x 1/4” Stainless 
37 1 Ground Screw 1/4” x 1/2” 
38 1 Round Terminal, 5/16” PF94010044
39
2.5
Gal Cooling Oil (Motor Housing) 
35
Oz. Cooling Oil (Seal Chamber) 
40 1 Diaphragm plate PF03160002
41 4Screw 1/4-20 x 1” Stainless 
Repair Kits
OVERHAUL KIT - To include items: 2, 5, 10, 13, 14, 15, 19, 21, 25, 26, 28, 29, 30 PF4NC-OHK
◊SEAL KIT - To include items: 15, 19, 21, 30 PF4NC-SK
■SEAL PROBE KIT - Includes items: 34, 35, 36 PF69775-1
Recommended Moisture & Temperature Sensor Relays for control panel (or equal):
P/N: PF0861 - Warrick relay #IDIEO rated for 25 volt amperes, 115 volt input, 500 volt output (one per pump).
P/N: PF0876 - IDEC relay #RH2BUAC120V (one per pump).
Recommended Capacitor Pack:
P/N: PF73301 - For PF4NC4524 & PF4NC7524, 230 volt, 1 phase.
 = Aquire standard hardware locally.
◊ = Seal/Gasket Kit
 = Overhaul Kit
 = Supplied as individual items
■ = Seal Probe Kit

15
Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
PF4NC Submersible Non-Clog Pumps
Trouble Shooting Chart
Risk of electric shock. Always disconnect the pump from the power source before handling inspections or repairs.
Symptom Possible Cause(s) Corrective Action
Pump will not run
1. Poor electrical connection, blown fuse, tripped
breaker or other interruption of power;
improper power supply
2. Motor or switch inoperative (go to manual
operation)
2a. Float movement restricted
2b. Switch will not activate pump or is defective
2c. Defective motor
3. Insucient liquid level
1. Check all electrical connections for security.
Have electrician measure current in motor leads,
if current is within ± 20% of locked rotor Amps,
impeller is probably locked. If current is 0,
overload may be tripped. Remove power, allow
pump to cool, then re-check current.
2a. Reposition pump or clean basin as required to
provide adaquate clearance for oat
2b. Disconnect level control. Set ohmmeter for a
low rang, such as 100 ohms full scale and
connect to level control leads. Actuate level
control manually and check to see that
ohmmeter shows zero ohms for closed switch
and full scale for open switch. (Float Switch)
2c. Check winding insulation (Megger Test) and
winding resistance. If check is outside of range,
dry and re-check. If still defective, replace per
service instructions.
3. Make sure liquid level is above the pump
4. Re-check all sizing calculations to determine
proper pump size.
5. Check discharge line for restrictions, including
ice if line passes through or into cold areas.
6. Remove and examine check valve for proper
installation and freedom of operation
7. Open valve
8. Check impeller for freedom of operation,
security and condition. Clean impeller cavity
and inlet of any obstruction
9. Loosen union slightly to allow trapped air to
escape. Verify that turn-o level of switch is set
so that the suction is always ooded. Clean vent
hole
10. Check rotation. If power supply is three phase,
reverse any two of three power supply leads to
ensure proper impeller rotation
11. Repair xtures as required to eliminate leakage
12. Check pump temperature limits and uid
temperature
13. Replace portion of discharge pipe with exible
connector or tighten existing piping.
14. Turn to automatic position
15. Check for leaks around basin inlet and outlets
Pump will not turn o
2a. Float movement restricted
2b. Switch will not activate pump or is defective
4. Ecessive inow or pump not properly sized for
application
9. Pump may be air locked causing pump not to ow
14. H-O-A switch on panel is in “HAND” position
Pump hums but doesn’t run
1. Incorrect low voltage
8. Impeller jammed or loose on shaft, or inlet
plugged
Pump delivers insucient capacity
1. Incorrect low voltage
4. Ecessive inow or pump not properly sized for
application
5. Discharge restricted
6. Check valve partially closed or installed backwards
7. Shut-o valve closed
8. Impeller jammed or loose on shaft, or inlet
plugged
9. Pump may be air locked causing pump not to ow
10. Piping xtures leaking or discharge before the
nozzle
Pump cycles too frequently or runs periodically
when xtures are not in use
6. Check valve partially closed or installed backwards
11. Fixtures are leaking
15. Ground water entering basin
Pump shuts o and turns on independent of
switch, (trips thermal overload protector).
CAUTION! Pump may start unexpectedly.
Disconnect power supply.
1. Incorrect low voltage
4. Ecessive inow or pump not properly sized for
application
8. Impeller jammed or loose on shaft, or inlet
plugged
12. Excessive water temperature (internal
protection only)
Pump operates noisily or vibrates excessively
2c. Worn bearings, motor shaft bent
5. Debris in impeller cavity or broken impeller
10. Pumprunning backwards
13. Piping attachments to building structure too
loose or rigid
NOTE: Power-Flo Pumps & Systems assumes no responsibility for damage or injury due to disassembly in the eld. Disassembly of the pumps or supplied
accessories other than at Power-Flo Pumps & Systems or its authorized service centers, automatically voids warranty.

16
Power-Flo Pumps & Systems • 877-24PUMPS • www.poweropumps.com
LIMITED WARRANTY
PF4NC Submersible Non-Clog Pumps
Manufacturer warrants, to the immediate purchaser and subsequent initial owner during the warranty period,
every new pump to be free from defects in material and workmanship under normal use and service, when properly
used and maintained, for a period of eighteen (18) months from date of manufacture or twelve (12) months from
date of installation (which ever comes rst). Failure due to wear due to excessive abrasives is not covered. The
initial owner is the purchaser who rst uses the pump after its initial installation, or for non-permanent installation,
the rst owner who uses the pump. The date of installation shall be determined by a dated sales receipt noting the
model and serial number of the pump. The dated sales receipt must accompany the returned pump. Product will be
repaired, replaced or remanufactured at Manufacturer’s option. No allowance will be made for shipping charges,
damages, labor or other charges that may occur due to product failure, repair or replacement. This warranty does
not apply to and there shall be no warranty for any material or product that has been disassembled without prior
approval of Manufacturer, subjected to misuse, misapplication, neglect, alteration, accident or act of God; that has
not been installed, operated or maintained in accordance with Manufacturer’s installation instructions; that has
been exposed to outside substances including but not limited to the following: sand, gravel, cement, mud, tar,
hydrocarbons, hydrocarbon derivatives (oil, gasoline, solvents, etc.), or other abrasive or corrosive substances, wash
towels or feminine sanitary products, etc. in all pumping applications. The warranty set out in the paragraph above
is in lieu of all other warranties expressed or implied; and we do not authorize any representative or other person
to assume for us any other liability in connection with our products. Contact Manufacturer at: 1-877-24PUMPS or
www.poweropumps.com, Attention: Customer Service Department, to obtain any needed repair or replacement
of part(s) or additional information pertaining to our warranty.
MANUFACTURER EXPRESSLY DISCLAIMS LIABILITY FOR SPECIAL, CONSEQUENTIAL OR INCIDENTAL
DAMAGES OR BREACH OF EXPRESSED OR IMPLIED WARRANTY; AND ANY IMPLIED WARRANTY OF FITNESS
FOR A PARTICULAR PURPOSE AND OF MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THE
EXPRESSED WARRANTY.
Some states do not allow limitations on the duration of an implied warranty, so the above limitation may not apply
to you. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitation or exclusion may not apply to you. This warranty gives you specic legal rights and you may also have
other rights which vary from state to state.