WDM NE Series User manual

Operation Manual
Submersible Non-clog pumps
4” &6”
NE Series.

Operation Manual.
2
1. Introduction.
Congratulations! You have purchased a product developed with the
latest technology from WDM Pumps, Inc. (referred to as “WDM”).
WDM designs and manufactures our products with the highest quality
components. Our experience as a manufacturer and our special care
and dedication in production result in products that meet the highest
standards.
The information contained in this manual is important for the
installation, operation and maintenance of your WDM NE pumps.
Read all instructions carefully before installing and using the product.
Keep this manual for future reference.
Our products are factory tested to ensure proper operation. Inspect
carefully and make sure there are no missing or damaged pieces
from shipping. If, upon delivery, parts are damaged or missing, make
a claim to the shipping company as soon as possible.
The design of this product,as well as the materials and processes
used in its manufacture provide for proper operation. However
product performance and lifespan depend on appropriate application,
installation, periodic inspection and general preventive maintenance.
This manual contains instructions for the installation and operation of
your NE pumps. Read these recommendations carefully before use.
Keep this manual for future reference.
WARNING.
WDM is not responsible for any damage or accidents that
occur when the instructions given in this manual have not been
followed. The warranty is only valid when using WDM original spare
parts. Failure to follow these guidelines in installing and starting your
pump will void your warranty.

NE Pumps.
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2. Safety Recommendations.
•Wastewater pumps NE, NE 4 and NE 6 are not recommended
for use in pools or water recreation facilities.
•WDM pumps are designed to operate safely when used and
maintained according to this manual.
•Rotating parts of the pumps are dangerous and can cause
injury. Operators and maintenance personnel should be
aware of and follow safety recommendations.
•The pumps are considered heavy equipment. Handle them
with care.
•Pumps should not pump hazardous material unless they have
been designed and designated to do so.
•The pipes and pump should never be forced to fit if using the
correct size. If you have to apply force, then get a different
size.
•To reduce the risk of electrical shock, all wiring of pumps,
motors, overload protection and control panels must be in
accordance with the National Electric Code (NEC) or the
Canadian Electrical Code (CEC) and all applicable state,
province, local codes and ordinances. Requirements will vary
depending on usage and location. Improper grounding will
void the warranty.
•To reduce the risk of electrical shock, always disconnect the
pump from the power source before handling or servicing.
Cable should be inspected frequently.
•Never handle connected power cords with wet hands.
•If any product is to be returned, it must be cleaned, sanitized,
or decontaminated as necessary according to any applicable
laws and regulations prior to shipment, to protect employees
from exposure to health hazards.
•Always wear eye protection when working on pumps.
•Loose fitting clothing can easily be caught by the impeller or
other moving parts, therefore do not wear loose fitting clothing
when doing maintenance or service work on the pump.
•Gloves should be worn whenever handling parts that have
sharp edges.
•Wear safety shoes when handling heavy parts or tools.
•For any maintenance always disconnect power.
•Never place hands in the suction or discharge openings.
•Safety handles should always be fastened securely before

Operation Manual.
4
attempting to lift the pump.
•The pump should not be operated without the proper safety
devices in place. If such devices are removed during service
and repair work, make sure they are replaced before
operating the pump again.
•Do not operate the pump when holding the cable assembly.
•Blocking or restricting the discharge hose may cause it to
whip under the pressure.
•Do not remove the drain plugs or valves if the pump is
operating.
•The pump should be isolated from a pressurized system
before it is removed.
•Allow pumps time to cool sufficiently before handling or
servicing them as heat and pressure build up inside during
operation.
•Never apply heat in disassembling a pump as doing so could
cause an explosion.
•Do not exceed manufacturer’s recommendation for maximum
performance, as doing so could cause the motor to overheat.
•If the discharge valve is closed, do not continue operating the
pump, the extreme heat from doing so can cause steam to
build up creating a dangerous pressure situation. A
temperature or pressure relief valve should be installed on
the pump body.
CAUTION.
If operating the pump with a plug-in type power cord, it
should have a ground fault circuit breaker.
CAUTION.
The pumps are not recommended for: Pumping flammable
liquids, for use in areas considered dangerous; for use in
pools or water recreation facilities, for umping liquids with abrasive
solids or operating above the recommended submergence level.
The use of these pumps in the cases mentioned will cause the loss
of your warranty.

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3. Installation.
Receiving
Pumps should be inspected upon receipt. Make note of damage or
missing parts, if any, and immediately file a claim with the shipping
company. During inspection, if the manual is removed, do not lose or
misplace it.
Location.
•Never install the pumps in soft ground trenches. This causes
the pump to sink and suction to be covered.
•Upon installation, make sure there is enough room to access
the pump for maintenance and inspection. Also make sure a
crane can access and lift the pump during removal.
•Be sure there is enough power for the motor to work.
•In order to ensure there is enough power for the motor,
electrical characteristics and limits on the motor data plate
should be followed.
The recommended the level of submergence is shown in
diagram No. 1.

Operation Manual.
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Always use the handle, and never the cord, to lift the pump.
Discharge (outlet) piping.
The discharge pipe should be as short as possible and fitted with
either a check or gate valve for each pump that uses the same line.
This valve is used to prevent backflow into the pump which can cause
excessive flooding and damage to the pump. The valve may also be
used to stop flow into the pump to help with priming and starting,
shutdown, maintenance, and pump removal.
•The discharge gate valve should be closed before the pump
is shut down if check valves are used.
•If the piping is short then it may be the same diameter as the
discharge opening.
•Like the suction piping, discharging piping’s diameter should
be 1 - 2 sizes larger the longer the pipe.
•If the discharge piping is horizontal, it is best to have an even
gradient.
•Air or gas may get trapped in high points along the piping
which retards the pump’s operation.
The NE pump is designed to allow installation or removal without
requiring personal to enter the well. If need it you can use WDM slide
rail system (Sold separately, does not includes rails).
ATTENTION.
WDM does not supply all the accessories (valves, gauges,
pipes, extensions, etc.) mentioned in this manual.
WARNING.
.
Pumps and pipes should be supported independently and their
connections must never be forced. Doing so will generate
stress on the pump and cause the pump to fail.

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Installation Diagram
Liquid level controls:
Float controls are supported by mounting a bracket which is attached to the
borehole wall, deck, or junction box. Use cable grips to hold the cables in
place during instillation. The level of control can be changed by loosening the
handle and adjusting the cable length according to the plans and
specifications. Make sure the float controls are correctly placed and the
pump is completely submerged when the level control is “Off”.
Electricalconnections.
Power and Cables Control: The cable assembly mounted to the
pump should not be modified in any way except for shortening to a
specific application. Any splice between the pump and the control
panel must be in accordance with all applicable electrical standards.
Gate Valve ½” Pressure
Relief piping
Check Valve
Control Panel
Discharge pipe
Rail guide
Elbow
Float controls

Operation Manual.
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Do not leave the electrical wire exposed, as it may cause serious
damage. The black, white, and red wires are all energy carriers or
conductors. The green wire is the grounding wire.
Overload protection:
For 3 phase pumps a normally closed (N/C) temperature sensor has
been embedded to detect when the motor is overheating because of
overload conditions. These thermal sensors trigger a shutdown when
the motor is too hot, and will automatically restart the pump once the
motor has cooled to a safe temperature. We recommend connecting
the sensors to an alarm that alerts the operator an overheating
situation has occurred and to stop the operation. If this situation
occurs, it should be reviewed to determine the cause and correct the
situation.
Humidity sensor
A normally open (N/O) contact is installed in the seal chamber in
order to detect if any moisture is present in the pump. We
recommend that this sensor be connected to an alarm to alert the
operator that moisture has been detected. If moisture is detected the
pump should be inspected and repaired.
ATTENTION.
Always use the installed handle, never the cord, to lift the
pump.
ATTENTION.
WDM does not supply all the accessories (valves,
gauges, pipes, extensions, etc.) mentioned in this operation
manual and installation.
ATTENTION.
Do not continue to operate the pump if an overload situation
arises.

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Wire Size
A licensed electrician should be consulted to determine what wire size
should be used if more power is required. Consult the table for electrical
information.
Model hp V Phases rpm
Amps
(max.)
Amps
(max) at
locked
rotor
Winding
resistance
at Start-up
Cable
size
NE 4 45-4-220 4.5 220 3 1,750 18.2 56.0 1.43 10/4
NE 4 45-4-440 4.5 440 3 1,750 9.1 28.0 5.71 10/4
NE 4 75-4-220 7.5 220 3 1,750 26.8 80.0 0.71 10/4
NE 4 75-4-440 7.5 440 3 1,750 13.0 40.0 2.85 10/4
NE 4 113-4-220 11.3 220 3 1,750 28.0 126.0 0.43 10/4
NE 4 113-4-440 11.3 440 3 1,750 14.0 63.0 1.72 10/4
NE 4 150-4-220 15.0 220 3 1,750 38.0 160.0 0.35 8/4
NE 4 150-4-440 15.0 440 3 1,750 19.0 80.0 1.45 8/4
NE 6 90-6-220 9.0 220 3 1,150 36.0 162.0 0.445 2/5
NE 6 90-6-440 9.0 440 3 1,150 18.0 81.0 1.780 2/5
NE 6 180-6-220 18.0 220 3 1,150 50.0 232.0 0.080 2/5
NE 6 180-6-440 18.0 440 3 1,150 25.0 116.0 0.320 2/5
NE 6 240-6-220 24.0 220 3 1,150 64.0 290.0 0.235 2/5
NE 6 240-6-440 24.0 440 3 1,150 32.0 145.0 0.940 2/5
NE 6 300-6-220 30.0 220 3 1,150 82.0 364.0 0.123. 2/5
NE 6 300-6-440 30.0 440 3 1,150 41.0 182.0 0.490 2/5
NE 6 180-4-220 18.0 220 3 1,750 50.6 232.0 0.270 2/5
NE 6 180-4-440 18.0 440 3 1,750 25.3 116.0 1.080 2/5
NE 6 240-4-220 24.0 220 3 1,750 62.8 290.0 0.205 2/5
NE 6 240-4-440 24.0 440 3 1,750 31.4 145.0 0.820 2/5
NE 6 300-4-220 30.0 220 3 1,750 76.0 364.0 0.188 2/5
NE 6 300-4-440 30.0 440 3 1,750 38.0 182.0 0.750 2/5
NE 6 360-4-220 36.0 220 3 1,750 90.0 434.0 0.110 2/5
NE 6 360-4-440 36.0 440 3 1,750 45.0 217.0 0.440 2/5
NE 6 480-4-440 48.0 440 3 1,750 65.0 290.0 0.540 2/5
NE 6 600-4-440 60.0 440 3 1,750 78.0 363.0 0.310 2/5
NE 6 750-4-440 75.0 440 3 1,750 96.0 576.0 0.187 2/5

Operation Manual.
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Pre-start checklist.
To avoid damage to the seal, and to maximize seal life observe the
following precautions:
•Stay within the temperature or pressure limitations specified
for the mechanical seal used.
•Do not run the pump dry or against a closed valve! Dry
operation will cause seal failure within minutes.
Before starting the pump, the following inspections should be made:
•All wiring to the motor and starting device should match the
wiring diagram. The motor should move in a clockwise
rotation when looking at it from the back. If the motor has
been in storage for any length of time, whether used or new,
then consult the motor instructions before starting. Use the
motor data plate to check the voltage, phase, and line circuit
frequency.
•In order to make sure it rotates freely, use your hands to turn
the rotating element..
•All piping should be checked for leaks. Also all flange bolts
should be checked to make sure they are tightened securely..
•Write down the serial number of the pump for future
reference.
CAUTION.
Operation of the pump while dry will result in serious
damage.
WARNING.
.
The pump should be operated within the conditions on the
name plate in order to protect the safety of the operator. If operated
outside such conditions, the pump could fail causing injury to operating
personal. In order to properly operate and maintain the pump and its
components, an instruction book should be consulted.

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•Perform an insulation (or megger) test on the motor before
putting the pump into service.
•Resistance values (ohms), voltage, and current (amps)
should all be recorded and saved for future reference.
Motor rotation.
Before checking motor rotation, make sure all components in the
system are wired and properly connected. If so then check the motor
rotation as follows.
If a 3 phase unit (only) – energize the motor briefly to make sure the
rotation is going in the direction indicated by the arrow in the pump
volute. If the rotation is not following the arrow, then switch the two
wires from the motor starter’s terminal.
Pump should be lowered into sump or basin, you can use NE lift rail
system sold separately to do so.
CAUTION.
To check the driver rotation, make sure pump and driver
couplings are fully disconnected and separated physically. Serious
damage will occur to both the pump and driver if the rotation is wrong.
CAUTION.
As pumps should not be operated while dry, be extremely
cautious in making sure the motor is energized only momentarily, just
long enough to determine if the rotation is proper.

Operation Manual.
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4. Starting the pump.
Start the pump by turning on the power to the motor as instructed in the
motor manual and follow this recommendation:
• Upon the pump reaching full operating speed, begin to open the
discharge gate valve slowly until complete system flow is
achieved.
• If there are pressure gauges on the pump, record pressure
readings to use as a reference in the future
• Also make sure the pump is falling within the parameters of the
performance curve.
• Check and record Voltage, amperage per phase, and kilowatts.
• Check system by filling the sump and allowing pump to operate.
Voltage regulation.
While the motor will operate satisfactorily under these voltage and
frequency variations, such operation may not be in accordance with
the standards established for operation in underrated conditions:
•Variation in the voltage may not exceed ± 10% the rating
specified on the motor data plate.
•Frequency variation may not exceed ± 5% the rating
specified on the motor data plate.
•The sum of the voltage and frequency variation may not
exceed ± 10% the motor rating while the frequency variation
does not exceed ± 5%.
Pump shutdown.
The following shutdown procedures will apply in most normal shut-
downs for the WDM pumps types NE.
•Close the discharge gate valve slowly to prevent hydraulic
shock, and then cut power to the motor.
•Cut power to motor.

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5. Maintenance.
Before attempting any inspection or repair on the pump, the driver
controls must be in the “OFF” position, locked and tagged to prevent
injury to personnel performing service on the pump.
Motor lubrication.
As the motor is filled with oil, there is no need to add lubricant of any
kind or additional motor maintenance work as these pumps are
generally very reliable and in most cases are able to continue to
operate smoothly for many years with little problems.
Preventative maintenance should be performed regularly, including:
1. Inspecting the motor and seal chambers for proper oil levels
and the presence of contamination and repair as necessary.
2. Inspecting the impeller and body for any excessive build-up
or clogging and repair as necessary.
3. Inspecting the motor and bearings and repair as necessary.
4. Inspecting the seal and diaphragm for any leakage or wear
and repair as necessary.
The pump is supplied from the factory with oil for cooling the motor,
only replace the oil if there is a failure or if you perform internal
maintenance work; use Texaco dielectric oil Diala-Oil-AX or Mobil
DTE Oil Light as the recommended in the following table:
WARNING.
If equipment is rotating, do not attempt to complete any
maintenance, inspection, repair, or cleaning until rotation has stopped
as such actions could result in injury to personnel..

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Operation Manual.
Model
Casing Seal chamber
Gallons Liters Gallons Liters
NE 4 450/750/1130/1500 2.5 9.5 0.3 1.1
NE 6 9/180/240 15.0 56.8 0.4 1.5
NE 6 300/480/600/750 11.0 41.6 0.4 1.5
Pressure Test
Casing: The oil should be at the correct level to check for any leaks
around the shaft seal, square rings, and cables. Remove the pressure
valve (22) from the motor housing (16). Apply the sealant and then
tighten the pressure gauge into the pressure valve (Diagram No. 3).
Apply air pressure into the motor housing at 10 P.S.I. Next, pour soapy
water around the sealed areas to see if any “air bubbles” occur. If after 5
minutes at a constant air pressure of 10 P.S.I. no “bubbles” occur then
remove the pressure gauge and air pressurizer and replace the valve
and seal. If “bubbles” do occur, then there is a leak that must be located
and repaired.
Seal Chamber: Remove the pipe plug (31) and check that the chamber is full
of oil. Then apply pipe sealant to the pressure gage and tighten into the
bearing bracket’s hole. Pressurize the seal to 20-25 P.S.I. and follow the
steps above to see if any “bubbles” occur indicating a leak.
CAUTION.
Do not completely fill the motor casing with oil as this can
cause buildup dangerous pressure that may destroy the pump. Allow
1.75”of air space below top of the motor housing.

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NE Pumps.
Cleaning.
If the pump is used for portable applications, pump clean water
through it after each use to prevent deposits of dirt and scale from
forming.
Impeller replacement.
In cleaning out the body (1), replacing the impeller (4), or replacing
the wear ring (on NE 6 pumps), disconnect the power, remove any
hex screws (13), and then lift the vertical motor and seal out of the
body. If necessary clean the body. Clean and examine the impeller
(4) for any pitting or wearing and replace as necessary. Inspect the
gasket (7) for any cuts or damage and replace as necessary. If the
impeller needs to be replaced remove the screw (33) and washer. As
the impeller is keyed onto the shaft with a square key (#), the impeller
should be pulled straight off the shaft using a wheel puller as
necessary. In the NE 6 pump, if the wear ring needs to be replaced
simply cut the ring (29) and remove being careful not to damage the
body (1).

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Operation Manual.
Mounting.
To install a new wear ring in the NE 6 apply a retaining compound
into the body wear ring housing (26) and press the wear ring in until
seated. In all models, when installing an impeller, apply a thin coat of
motor oil to the shaft and slide the impeller up and down the shaft
while keeping the keyways aligned. Then drive the key (#) into the
keyway, locate and affix the washer, and apply thread lock, set
according to the manufacturer’s instructions. Apply the thread locking
compound on the screw (33) then thread into the shaft and torque to
35lb/ft. Place the gasket (41) on the flange of the body and install the
impeller and motor housing on the posts and spiral (26). Next apply
the thread locking compound onto the threads of each bolt (24) and
nut (20) on the stud (24). Then torque to 24 ft/lb. Finally check to see
if motor and impeller rotate freely.
Nut
Impeller
Motor
Housing
Gasket
Impeller
Bolt
Washer (27)
Stud
Impeller
Washer (27)
Gasket
Wear
Ring
Body
Body

17
NE Pumps.
Servicing Motor and Mechanical Seal:
•Remove the body (1) and impeller (4) as stated above.
•Drain the oil from the casing (16) and remove the valve (22).
•Remove the screws (13) and separate the motor (5) with the
coupling (3) from the casing (16).
•Disconnect the motor (5) from the cable assembly (20),
release the coupling screws and remove the seal plate (2)
together with the stationary part of the seal (6) of the motor
(5).
•Now examine the motor, bearings, and seal components.
•Upon observation, replace what is worn or damaged.
•If a replacement requires a seal component, then replace
everything.
•Carefully reassemble the seal, making sure not to scratch or
mark up the new surfaces.
•When replacing the seal remove the rotating component,
motor shaft spring, and the fixed part of the coupling. Then
clean the double seal cavity (3).
•Place the new component into the double seal plate (3) with
the hard side of the fixed part in the seal plate (2). Make sure
the spring on the rotating component is set properly.
ATTENTION.
When installing the pump impeller in a NE 4 unit, check that
the clearance between the impeller and the flat face of the
body is within 0.010 “(0.25mm) to 0.030” (0.7mm).

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Operation Manual.
Carefully assemble the double seal bracket (3) onto the
motor (5) using motor screws. Then tighten the screws and
insert into the body housing (16). Secure the coupling with
nuts (13) and then add oil as specified above.
Electrical connections.
Check the cables to ensure there are no tears or defects. In case of
damage, replace the entire cable assembly cover (20). Remove the
motor cables through the top of the pump housing, check their
sleeves, and replace as necessary. Place the square ring (23) in the
conduit housing (20) reconnecting motor leads to power cables and
moisture and temperature sensors to control cables as shown in
Diagram 4.
Double Seal
Bracket (3)
Mechanical Seal (6)
Seal Plate (2)
Clamp
Diaphragm

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NE Pumps.

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Operation Manual.
NE 4