Wacker Neuson PST3 750, PSTF3 750 Operator's Manual

Operator’s Manual

Pump

PST3 750

PSTF3 750

0176744en 002 0510

0176744EN

Copyright
notice

© Copyright 2010 by Wacker Neuson Corporation.

All rights, including copying and distribution rights, are reserved.

This publication may be photocopied by the original purchaser of the machine. Any
other type of reproduction is prohibited without express written permission from
Wacker Neuson Corporation.

Any type of reproduction or distribution not authorized by Wacker Neuson Corporation
represents an infringement of valid copyrights. Violators will be prosecuted.

Trademarks

Manufacturer

All trademarks referenced in this manual are the property of their respective owners.

Wacker Neuson Corporation

N92W15000 Anthony Avenue

Menomonee Falls, WI 53051 U.S.A.
Tel: [phone] · Fax: [phone] · Tel: [phone]

www.wackerneuson.com

Original
instructions

This Operator’s Manual presents the original instructions. The original language of this
Operator’s Manual is American English.

PST3/PSTF3 750 Foreword

Foreword

Machines
covered in
this manual

Machine Item Number

PST3 750 0620337

0620440

PSTF3 750 0620338

0620441



Machine
documentatio
n

Keep a copy of the Operator’s Manual with the machine at all times.



Use the separate Parts Book supplied with the machine to order replacement parts.



Refer to the separate Repair Manual for detailed instructions on servicing and
repairing the machine.



If you are missing any of these documents, please contact Wacker Neuson
Corporation to order a replacement or visit www.wackerneuson.com.



When ordering parts or requesting service information, be prepared to provide the
machine model number, item number, revision number, and serial number.

Expectations
for
information in
this manual

Manufacturer’
s approval



This manual provides information and procedures to safely operate and maintain
the above Wacker Neuson model(s). For your own safety and to reduce the risk of
injury, carefully read, understand, and observe all instructions described in this
manual.



Wacker Neuson Corporation expressly reserves the right to make technical
modifications, even without notice, which improve the performance or safety
standards of its machines.



The information contained in this manual is based on machines manufactured up
until the time of publication. Wacker Neuson Corporation reserves the right to
change any portion of this information without notice.

This manual contains references to approved parts, attachments, and modifications.
The following definitions apply:



Approved parts or attachments

are those either manufactured or provided by

Wacker Neuson.



Approved modifications

are those performed by an authorized Wacker Neuson

service center according to written instructions published by Wacker Neuson.



Unapproved parts, attachments, and modifications

are those that do not meet

the approved criteria.

Unapproved parts, attachments, or modifications may have the following
consequences:



Serious injury hazards to the operator and persons in the work area



Permanent damage to the machine which will not be covered under warranty

Contact your Wacker Neuson dealer immediately if you have questions about approved
or unapproved parts, attachments, or modifications.

wc_tx001079gb.fm 3

Foreword PST3/PSTF3 750

4 wc_tx001079gb.fm

Table of ContentsPST3/PSTF3 750

Foreword 3

1 Safety Information 7

1.1 Signal Words Used in this Manual ....................................................... 7

1.2 Operating and Electrical Safety ............................................................ 8

1.3 Informational Labels ............................................................................. 8

2 Operation 9

2.1 Names of Parts ..................................................................................... 9

2.2 Prior to Operation ............................................................................... 10

2.3 Installation .......................................................................................... 10

2.4 Installing the Float (if equipped) ......................................................... 13

2.5 Electrical Wiring .................................................................................. 14

2.6 Electrical Circuit Diagrams ................................................................. 16

2.7 Operation ............................................................................................ 17

2.8 Automatic Operation (PSTF3 750 only) ............................................. 20

3 Maintenance 21

3.1 Periodic Maintenance Table ............................................................... 21

3.2 Maintenance and Inspection .............................................................. 22

3.3 Disassembly and Reassembly ........................................................... 24

3.4 Disassembly ....................................................................................... 24

3.5 Impeller Inspection ............................................................................. 25

3.6 Impeller Reassembly .......................................................................... 26

3.7 Troubleshooting .................................................................................. 27

4 Technical Data 29

4.1 Standard Specifications ...................................................................... 29

4.2 Operating Specifications .................................................................... 30

4.3 Dimensions ......................................................................................... 31

wc_bo0176744en_002TOC.fm 5

Table of Contents PST3/PSTF3 750

6 wc_bo0176744en_002TOC.fm

PST3/PSTF3 750 Safety Information

1 Safety Information

1.1 Signal Words Used in this Manual

This manual contains DANGER, WARNING, CAUTION, NOTICE, and
NOTE signal words which must be followed to reduce the possibility
of personal injury, damage to the equipment, or improper service.

This is the safety alert symbol. It is used to alert you to potential personal hazards.
f Obey all safety messages that follow this symbol.

DANGER

DANGER indicates a hazardous situation which, if not avoided, will result in death
or serious injury.

f

To avoid death or serious injury from this type of hazard, obey all safety messages that
follow this signal word.

WARNING

WARNING indicates a hazardous situation which, if not avoided, could result in
death or serious injury.

To avoid possible death or serious injury from this type of hazard, obey all safety mes-

f

sages that follow this signal word.

CAUTION!

CAUTION indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.

f

To avoid possible minor or moderate injury from this type of hazard, obey all safety mes­sages that follow this signal word.

NOTICE: Used without the safety alert symbol, NOTICE indicates a

situation which, if not avoided, could result in property damage.

Note: A Note contains additional information important to a procedure.

wc_si000288gb.fm 7

Safety Information PST3/PSTF3 750

1.2 Operating and Electrical Safety

To reduce risk of electric shock, connect only to a properly grounded,
grounding-type receptacle.

WARNING

Risk of electric shock—this pump has not been investigated for use in
swimming pool areas.

An acceptable motor-control switch shall be provided at the time of
installation according to local codes and regulations.

To reduce risk of electric shock, follow instructions in this manual for
proper installation.

CAUTION: This pump may automatically restart. Prior to working on
the pump or control panel, all supply circuits must be disconnected.

CAUTION: Risk of shock—do not remove cord and strain relief.

1.3 Informational Labels

Label Meaning

A nameplate listing the model number, item num-

Wacker Neuson Corporation

Phase

Menomonee Falls, WI 53051 USA

Man. Y/M

THERMALLY PROTECTED
INDOORS OR OUTDOORS

CSA ENCLOSURE 3

Amp.

Conforms to UL Std. 778

Cert. to CAN/CSA St d.

C22.2 No. 108-M89

kWkgMax. L/minMax. m

HPlbsMax. GPMMax. ft

CUS

MADE IN JAPAN

Model Item No. Rev.

Serial No.

VHz

L

I

S

2001993

R

D

E

T

ber, revision number, and serial number is
attached to each unit. Please record the informa­tion found on this plate so it will be available
should the nameplate become lost or damaged.
When ordering parts or requesting service infor­mation, you will always be asked to specify the
model number, item number, revision number,
and serial number of the unit.

8 wc_si000288gb.fm

PST3/PSTF3 750 Operation

3

2 Operation

2.1 Names of Parts

See Graphic: wc_gr005663

1

8

2
3
4
5

6

7

Ref. Description Ref. Description

1 Lifting handle 8 Cable assembly

2 Mechanical seal 9 Oil plug

3 Lubricant 10 Oil lifter

10

9
11

12
13

14

wc_gr00566

4 Oil casing 11 Shaft sleeve

5 Hose coupling 12 Impeller

6 Pump casing 13 Stirrer

7 Casing packing 14 Strainer stand

wc_tx000987gb.fm 9

Operation PST3/PSTF3 750

2.2 Prior to Operation

When the pump is delivered, first perform the following checks:

• Inspection

While unpacking, inspect the product for damage during shipment, and
make sure all bolts and nuts are tightened properly.

• Specification check

Check the model number to make sure it is the product that was
ordered. Be certain it is the correct voltage and frequency.

Note: If there is any problem with the product as shipped, contact your
nearest dealer or Wacker Neuson representative at once.

• Product specifications

Do not operate this product under any conditions other than those for
which it is specified. Failure to observe this precaution can lead to

CAUTION

electrical shock, current leakage, fire, water leakage or other
problems.

2.3 Installation

If the pump is used to drain a swimming pool, the pump must be
connected to a Ground Fault Interrupter (GFI).

WARNING

If the pump is used in fountains, the pump must be connected to a
Ground Fault Interrupter (GFI).

The pump must not be used when people are in the water.

Leakage of pump lubricants may cause pollution of water.

Proper plug must be provided according to local codes and standards.
Refer to wiring diagram.

Do not use this pump in liquids other than water, such as oil, salt water,
or organic solvents.

Use with a power supply voltage within ±5% of the rated voltage.

Do not use in water temperatures outside the range of 0–40°C
(32–104°F) which can lead to failure, current leakage or shock.

Do not use in the vicinity of explosive or flammable materials.

Use only in fully assembled state.

Note: Consult your local dealer or Wacker Neuson representative
before using with any liquids other than those indicated in this
document.

10 wc_tx000987gb.fm

PST3/PSTF3 750 Operation

Preparing for installation

Before installing the pump at a work site, you will need to have the
following tools and instruments ready:

• Insulation resistance tester (megohmmeter)

• AC voltmeter

• AC ammeter (clamp-on type)

• Bolt and nut tighteners

• Power supply connection tools (screwdriver or box wrench)

Note: Please also read the instructions that come with each of the test
instruments.

Checks to Make Before Installation

When a three-prong grounded plug is used:

Use the megohmmeter to measure the motor insulation resistance
between the grounding prong and each one of the two power prongs.

When connection wires are used:

With the megohmmeter, measure the insulation resistance between
the ground wire (Green) and each one of the two power wires.

Reference insulation resistance: 20MΩ or greater.

Note: The reference insulation resistance (20MΩ or greater) is the
value when the pump is new or has been repaired. For the reference
value after installation, see the Periodic Maintenance table.

Precautions in Installation

When installing the pump, pay close attention to its center of gravity
and weight. If it is not lowered into place correctly, it may fall and be

WARNING

damaged or cause injury.

When transporting the machine by hand, be sure to employ manpower
commensurate with the weight of the machine. To avoid back injury
when lifting the machine, bend the knees to pick it up rather than
bending your back only.

Do not under any circumstances install or move the pump by
suspending it from the cable assembly. The cable may be damaged,

CAUTION

causing current leakage, shock, or fire.

2.3.1 Avoid dropping the pump or other strong impact. Lift the pump by
holding it firmly with the hands or by attaching a rope or chain to the
lifting handle.

Note: On cable assembly handling, see Electrical Wiring.

Avoid dry operation, which will not only lower performance but can
cause the pump to malfunction, leading to electrical leakage and

CAUTION

wc_tx000987gb.fm 11

shock.

Operation PST3/PSTF3 750

2.3.2 Install the pump in a location with sufficient water level, where water
collects readily.

Note: See Operation (“Operating Water Level”) for the water level
necessary for operation.

Note: The discharge end of the hose should be located higher than the
water surface. If the end of the hose is submerged, water may flow
back to the pump when the pump is stopped; and if the hose end is
lower than the water surface, water may overflow when the pump is
turned off.

If large quantities of earth are sucked up, damage resulting from
friction in the pump can lead to current leakage and shock.

CAUTION

2.3.3 Use the pump in the upright position. To prevent the strainer from
becoming submerged in mud, causing it to suck in sand or debris,
mount it on a block or other firm base.

2.3.4 If used in a permanent installation where the pump is not readily
accessible after installation, please contact Wacker Neuson for a
duplicate nameplate to be installed at the wellhead or on the control
box so that it will be readily visible.

12 wc_tx000987gb.fm

PST3/PSTF3 750 Operation

2.4 Installing the Float (if equipped)

See graphic: wc_gr005664

wc_gr005664

2.4.1 Set the length of the float lead wire to the dimension indicated below.
Failure to set the correct lead wire length will lead to improper
operation of the pump.

Pump model Length “L”

PSTF3 750 150 mm (5.9 in.)

NOTICE: Install the float so that it moves freely up and down. If the
float binds or catches, it will cause the pump to operate improperly.

wc_tx000987gb.fm 13

Operation PST3/PSTF3 750

2.5 Electrical Wiring

Performing electrical wiring

Electrical wiring should be performed by a qualified person in accord
with all applicable regulations. Failure to observe this precaution not

WARNING

WARNING

only risks breaking the law but is extremely dangerous.

Incorrect wiring can lead to current leakage, electrical shock or fire.

Always make sure the pump is equipped with the specified overload
protectors and fuses or breakers, so as to prevent electrical shock from
a current leak or pump malfunction.

Operate within the capacity of the power supply and wiring.

Grounding

Do not use the pump without first grounding it properly. Failure to
ground it can lead to electrical shock from a current leak or pump
malfunction.

CAUTION

WARNING

CAUTION

Do not attach the grounding wire to a gas pipe, water pipe, lightning
arrester or telephone grounding wire. Improper grounding can result in
electrical shock.

Connecting the power supply

Before connecting wires to the terminal, make certain the power supply
is turned off (circuit breaker, etc.), to avoid electrical shock, shorting,
or unexpected starting of the pump, leading to injury.

Before inserting the power supply plug, make certain the power supply
is turned off (circuit breaker, etc.), to avoid electrical shock, shorting,
or unexpected starting of the pump, leading to injury.

Do not use the pump with the cable assembly or plug connected
loosely, which can result in electric shock, shorting, or fire.

Draw power from a dedicated power outlet rated at 15 A or above.
Sharing the outlet with other equipment may cause overheating at the
branch outlet and could result in fire.

• The grounded plug shall be connected as shown in the drawing.

NOTICE: Be sure to use a dedicated power supply with a ground
leakage circuit breaker.

Note: The shape of the plug may differ from that shown in the
illustration.

See Graphic: wc_gr000242

14 wc_tx000987gb.fm

PST3/PSTF3 750 Operation

Cable Assembly

If it is necessary to extend the cable assembly, use a core size equal
to or larger than the original. This is necessary not only to avoid a

CAUTION

performance drop, but to prevent cable overheating which can result in
fire, electrical leakage or electrical shock.

If a cable with cut insulation or other damage is submerged in the
water, there is a danger of damage to the pump, electrical leakage,
electrical shock, or fire.

Be careful not to let the cable assembly be cut or become twisted. This
may result in damage to the pump, electrical leakage, electrical shock,
or fire.

If it is necessary to submerge the connection wires of the cable
assembly in water, first seal the wires completely in a molded
protective sleeve, to prevent electrical leakage, electrical shock, or fire.

Do not allow the cable assembly wires or power supply plug to become
wet.

Make sure the cable does not become excessively bent or twisted, and
does not rub against a structure in a way that might damage it.

If used in a deep-well installation, the cable assembly should be
secured every 6 m (20 ft.).

wc_tx000987gb.fm 15

Operation PST3/PSTF3 750

2.6 Electrical Circuit Diagrams

See Graphic: wc_gr005665

PST3 750

R(Br) R

W (L)

G (G/Y)

6

5

Y/G

W

7

9

B

1

LL

2

3

PSTF3 750

R(Br)

W (L)

6

8

R

W

Y/G

If connected to a circuit protected by a fuse, use a time-delay fuse with
this pump.

CAUTION

Ref. Description Ref. Description

1 Capacitor 6 Ground

7

9

B

5

2

1

LL

3

wc_gr005665

2 Main coil 7 Circle thermal protector

3 Auxiliary coil 8 Float switch

(normally open contact)

4 Miniature protector 9 Heater

5 Frame grounding

Wire Colors

B Black V Violet Or Orange

G Green W White Pr Purple

L Blue Y Yellow Sh Shield

P Pink Br Brown LL Light Blue

R Red Cl Clear G/Y Green/Yellow

T Tan Gr Gray

16 wc_tx000987gb.fm

PST3/PSTF3 750 Operation

2.7 Operation

Before starting

2.7.1 Make sure once again that the product is of the correct voltage and
frequency rating.

NOTICE: Using the product at other than rated voltage and frequency
will not only lower its performance but may damage the product.

Note: Confirm the rated voltage and frequency on the model
nameplate.

2.7.2 Confirm the wiring, supply voltage, circuit breaker capacity, and motor
insulation resistance.

Reference insulation resistance = 20 MΩ or greater.

Note: The reference insulation resistance (20 MΩ or greater) is the
value when the pump is new or has been repaired. For the reference
value after installation see “Periodic Maintenance Table.”

2.7.3 The setting on the circuit breaker or other overload protector should be
made in accord with the rated current of the pump.

Note: See “Operating Specifications” for the rated current of the pump.

2.7.4 When powering the pump with a generator, be certain the generator is
sized to supply the required power for the pump and any other
equipment powered by the generator.

Test Operation

Do not operate the pump while it is suspended in the air. The recoil
may result in injury or other major accident.

WARNING

Do not start the pump when people are standing next to it. A current
leak can result in electrical shock.

WARNING

Run the pump for a short time (3–10 minutes) and confirm the
following:

• Using an ammeter (clamp-on type), measure the operating cur-

rent at the L1 and L2 phase wires on the terminal.

COUNTERMEASURE: If the operating current exceeds the rated
value, pump motor overload may be a cause. Make sure the pump has
been installed under proper conditions as described in Installation.

• Using an AC voltmeter (tester), measure voltage at the terminals.

Supply voltage tolerance: within ±5% of rated voltage.

wc_tx000987gb.fm 17

Operation PST3/PSTF3 750

COUNTERMEASURE: If the supply voltage is outside the tolerance,

possible causes are the power supply capacity or an inadequate
extension cable. Look again at the wiring diagram and make sure the
conditions are proper.

In case of very excessive vibration, unusual noise or odor, turn off the
power immediately and consult your nearest dealer or Wacker Neuson

CAUTION

representative. Continuing to operate the pump under abnormal
conditions may result in electrical shock, fire, or current leakage.

Operation

The pump may become very hot during operation. Be careful not to
contact the pump accidentally to avoid being burned.

WARNING

Make sure no extraneous objects such as pins, nails or other metal
objects are sucked into the pump. These can damage the pump or
cause it to malfunction, and can result in electrical shock or electrical
leakage.

When the pump is not used for an extended period, be sure to turn off
the power (circuit breaker, etc.). Deterioration of the insulation may
lead to electrical leakage, electrical shock, or fire.

In case of a power outage, turn off the power to the pump to avoid
having it start unexpectedly when the power is restored, presenting
serious danger to people in the vicinity.

Pay careful attention to the water level while the pump is operating. Dry
operation may cause the pump to malfunction.

Note: See section “Operating water level” for the water level
necessary for operation.

If the protection system operates due to an overload or malfunction,
causing the pump to stop, first investigate and remove the cause
before restarting.

Sharp bends in the hose, especially near its base, may cause air
pockets to form resulting in idle operation. Lessen the degree of
bending while continuing to operate the pump.

18 wc_tx000987gb.fm

PST3/PSTF3 750 Operation

Operating water level

Do not operate the pump below the C.W.L. (Continuous running Water
Level) indicated below. Failure to observe this condition may result in

CAUTION

damage to the pump, current leakage or electrical shock.

See Graphic: wc_gr005667

wc_gr005667

.

Pump Model

PST3 750
PSTF3 750

Continuous running Water Level

(C.W.L.)

90 mm (3.5 in)
180 mm (7.1 in.)

Motor Protection System (Motor Protector)

The pump has a built-in motor protection system (Miniature Protector).
If the motor overheats, for reasons such as the following, the pump will
automatically stop operating regardless of the water level, to protect
the motor:

• Change in supply voltage polarity

• Overload

• Open-phase operation or operation under constraint

Note: Always determine the cause of the problem and resolve it before
resuming operation. Simply repeating cycles of stopping and restarting
will result in damage to the pump. Do not continue operation at very
low lift, low water level, or while the strainer is clogged with debris. Not
only will performance suffer, but also such conditions may cause
noise, heavy vibration, and malfunctioning.

wc_tx000987gb.fm 19

Operation PST3/PSTF3 750

2.8 Automatic Operation (PSTF3 750 only)

See Graphic: wc_gr005666

The PSTF3 750 pump is equipped with a float switch to detect the
water level. The float switch (a) enables the pump to perform an
automatic drainage operation when connected to a continuous power
supply.

a

wc_gr005666

Connect the power and perform a trial operation as follows:

2.8.1 Move the float switch down to its lowest position.

2.8.2 Raise the float switch. This will start the pump.

2.8.3 Lower the float switch to its original position. This will stop the pump.

2.8.4 Repeat this cycle two or three more times to verify the operation. Note:
The trial operation must be completed within one minute.

If the pump operates abnormally (i.e. exhibits an unusually large
amount of vibration, noise, or odor), disconnect the power supply

CAUTION

immediately and contact your Wacker Neuson dealer. Do not operate
the pump in this condition, otherwise there is a risk of current leakage,
electrical shock, or fire.

20 wc_tx000987gb.fm

PST3/PSTF3 750 Maintenance

3 Maintenance

3.1 Periodic Maintenance Table

Pump

Measure operating current.
Compare with rated current.

Daily Monthly Every 6

months

or

1000

hrs.



Measure supply voltage.
Compare with allowable range (within ±5% of



rated voltage).

Measure insulation resistance.
Reference insulation resistance =

W or greater. (1)

1M



Pump inspection.
A noticeable drop in performance may indicate
wear in the impeller, etc., or else clogging of



the strainer, etc. Remove the clogged debris
and replace any worn parts.

Lubricant inspection. 

Every

year or

2000

hrs.

Every

2–5

years

Change lubricant.
Designated lubricant: SAE 10W/20W. (2)



Change mechanical seal. (3) 

Overhaul.
This should be carried out even if there are no
problems with the pump. The frequency
depends on how continuously the pump is in
use. (4)

(1) If the insulation resistance has become noticeably lower than the previous inspection, an inspec-

tion of the motor will be necessary.

(2) See Lubricant Inspection and Lubricant Change in this section.
(3) Specialized know-how is required for inspecting and replacing the mechanical seal. Consult with

your nearest dealer or Wacker Neuson representative.

(4) Consult with your nearest dealer or Wacker Neuso n representative regarding overhauls.



wc_tx000988gb.fm 21

Maintenance PST3/PSTF3 750

3.2 Maintenance and Inspection

Regular maintenance and inspections are a necessity for continued
efficient functioning of the pump. If any abnormal conditions are
noticed, refer to the Troubleshooting section and take corrective
measures immediately. It is recommended that a spare pump be kept
ready in case of any problems.

Prior to inspecting

Before inspecting the pump, make certain the power supply (circuit
breaker, etc.) is turned off. Then, unplug the cable assembly from the

WARNING

3.2.1 Washing the pump

3.2.2 Inspecting the pump exterior

receptacle or detach it from the terminals. Failure to follow this
precaution may result in a serious accident from electrical shock or
unexpected starting of the pump motor.

Remove accumulated matter from the surface of the pump and wash
it with clean water. Take special care to remove any debris from the
impeller.

Look for any peeling or chipped paint, and make sure the nuts and
bolts are fastened tightly. Any cracks in the surface should be repaired
by cleaning that area, drying it and then applying a touch-up coating.

Note: Touch-up paint is not supplied. Note that some kinds of damage
or looseness may require that the unit be disassembled for repairs.
Please consult your nearest dealer or Wacker Neuson representative.

Storage

When the pump is out of use for an extended period, wash it and dry it
thoroughly, then store it indoors.

Note: Always run a test operation before putting the pump back into
service.

If the pump is left in the water, it should be run a minimum of once a
week.

• Inspecting Lubricant

Remove the oil plug and tilt the pump to drain a small amount of
lubricant. If the lubricant is milky white or has water mixed in with it, the
mechanical seal may be faulty. In this case the pump will need to be
disassembled and repaired.

• Replacing Lubricant

Remove the oil plug and drain all the lubricant, then replace it with the
specified amount.

Note: Worn lubricant and other waste products should be disposed of
by a qualified agent, in accord with applicable laws. The oil plug gasket
should be replaced each time the lubricant is inspected or changed.

22 wc_tx000988gb.fm

PST3/PSTF3 750 Maintenance

See Graphic: wc_gr005668

1

2

4
3

wc_gr005668

Ref. Description Ref. Description

1 Oil inlet 3 Oil plug

2 Gasket 4 Allen wrench

Pump Model Lubricant Capacity

PST3 750

160 ml (5.4 fl. oz.)

PSTF3 750

Replacement Parts

The table lists the parts that need to be replaced periodically. Replace
these using the recommended frequency as a guideline.

Part Replacement Frequency

Mechanical seal When lubricant in oil compartment becomes milky.

Lubricant (SAE 10W/20W) Every 2,000 hours or 12 months, whichever comes first.

Gasket Each time pump is disassembled or inspected.

Dust seal When ring is worn, and each time pump is disassem-

Sleeve When it becomes worn.

wc_tx000988gb.fm 23

bled or inspected.

Maintenance PST3/PSTF3 750

3.3 Disassembly and Reassembly

Before disassembling the pump, make certain the power supply (circuit
breaker, etc.) is turned off. Then, unplug the cable assembly from the

WARNING

receptacle or detach it from the terminals. To avoid electrical shock,
DO NOT work with wet hands.

NEVER check the operation of any parts (impeller rotation, etc.) by
turning on the power while the unit is partially assembled. Failure to
observe these precautions may result in a serious accident.

DO NOT disassemble or repair any parts other than those designated
here. If repairs are necessary in any other than the designated parts,
consult your nearest dealer or Wacker Neuson representative.
Improper repairs can result in electrical leakage, electrical shock, fire,
or water leaks.

After reassembly, ALWAYS perform a test operation before resuming
use of the pump. Improper assembly will cause the pump to
malfunction, resulting in electric shock or water leaks.

The procedure for disassembly and reassembly is shown here to the
extent necessary for impeller replacement. A specialized environment
and facilities are necessary for work on the mechanical seal and the
motor parts. Contact your nearest dealer or Wacker Neuson
representative in the event such repairs are necessary.

3.4 Disassembly

See Graphic: wc_gr005669

Note: For assembly or disassembly, place the pump on its side.

Note: It is not necessary to drain the oil for disassembly and inspection

of the impeller (m). However, drain oil if further disassembly and
testing is required.

3.4.1 Loosen the three hex nuts (b) and remove the three hex bolts (a).

3.4.2 Remove the strainer stand (c) and the pump casing (d).

3.4.3 While keeping the impeller from rotating, remove stirrer nut (j), spring
washer (k) and plain washer (l).

Impeller vanes may be very sharp due to excessive wear. Handle with
care.

CAUTION

3.4.4 Remove impeller.

Note: If the parts are worn or damaged, make sure to replace them
with new ones.

24 wc_tx000988gb.fm

PST3/PSTF3 750 Maintenance

o

n

m

l

d

c

a

3.5 Impeller Inspection

k

b

j

g

h

i

e

f

wc_gr005669

See Graphic: wc_gr005669

3.5.1 Visually inspect impeller (m) for corrosion, wear or damage. Worn
impellers compromise peak performance.

3.5.2 Visually inspect shaft sleeve (n) and pump shaft for signs of uneven
wear.

3.5.3 Visually inspect pump casing (d) for cracks, wear and damage. Look
for signs of wear on surfaces facing impeller.

wc_tx000988gb.fm 25

Maintenance PST3/PSTF3 750

3.6 Impeller Reassembly

See Graphic: wc_gr005669

Note: If, upon inspection and testing, a pump component requires
replacement, use only replacement parts available from or approved
by Wacker Neuson.

o

n

m

l

d

c

e

a

k

j

g

h

i

f

wc_gr005669

b

3.6.1 Turn pump on its side.

3.6.2 Remove sand, dirt, and other debris from rubber parts such as the
impeller (m) and casing packing (o) before assembling the pump.

3.6.3 Make sure the casing packing fits snugly against the pump base.

3.6.4 Place the shaft sleeve (n), impeller, plain washer (l), and spring
washer (k), and stirrer (j) onto the pump shaft.

3.6.5 Tighten the stirrer, being careful not to apply excessive force that might
deform the impeller or cause the rubber liner to flake off.

3.6.6 Pre-test pump to verify proper operation.

26 wc_tx000988gb.fm

PST3/PSTF3 750 Maintenance

3.7 Troubleshooting

Before ordering repairs, carefully read through this manual, then
repeat the inspection. If the problem remains, contact your nearest
dealer or Wacker Neuson representative.

ALWAYS turn off the power before inspecting the pump. Failure to

WARNING

Problem / Symptom Reason / Remedy

observe this precaution can result in serious accident.

Pump will not start

Pump stops soon after start-

ing (Motor protector operates)

Pump does not stop automat-

ically

• Power is off. Restore power.

• Cable assembly is cut or not connected properly. Repair/
replace the cable or fix the connection.

• Impeller is clogged. Inspect the pump and remove any
debris.

• Impeller is clogged. Remove debris.

• Low voltage. Provide the rated voltage, or make sure the
cable assembly extension is the proper standard.

• Wrong power frequency. Check the nameplate, and
replace the pump or the impeller.

• Extended operation with a clogged strainer. Remove
debris from the strainer.

• Float (if equipped) is obstructed, not moving freely, or mal­functioning. Remove obstructions. Repair or replace float
switch if necessary.

• Float (if equipped) is obstructed, not moving freely, or mal­functioning. Remove obstructions. Repair or replace float
switch if necessary.

Poor lift or discharge
capacity

Heavy vibration or noise

wc_tx000988gb.fm 27

• Water level of float (if equipped) set lower than pump’s min­imum operating water level. Set float higher than pump’s
minimum operating water level.

• Faulty motor. Repair or replace the motor.

• Excessive sand is discharged. Place the pump on a block
or other base to prevent the sand from being sucked into it.

• Worn out impeller. Replace.

• Sharply bent or clogged hose. Straighten out any sharp
bends. Enclose the pump with a screen to keep away
debris.

• Strainer clogged or buried. Remove debris from the
strainer, or place a block under the pump.

• Damaged motor shaft or bearings. Contact dealer and
replace motor or bearings.

Maintenance PST3/PSTF3 750

Notes:

28 wc_tx000988gb.fm

PST3/PSTF3 750 Technical Data

4 Technical Data

4.1 Standard Specifications

Applicable liquids,
consistency and

Water, rain water, ground water, sand-carrying water,

mud-carrying water

temperature

0–40°C (32–104°F)

Pump Impeller Vortex type

Shaft seal Double mechanical seal

Bearing Shielded ball bearing

Motor Specification Dry submersible induction motor

(2-pole)

Insulation Class E

Protection
system (built-in)

Miniature protector (0.4 kW)
Circle thermal protector (0.55 kW)

Lubricant SAE 10W/20W

Such as:
–Turbine Oil ISO VG #32
–Shell Victrolia Oil #27
–British Pet Energol THB #32
–Gulf Paramount #32
–Tellus #T22 Shell Oil
–Shell Turbo T32

Connection Hose coupling

wc_td000296gb.fm 29

Technical Data PST3/PSTF3 750

4.2 Operating Specifications

Part No. PST3 750

PSTF3 750

Pump

Electric power

Rated current

V/Ph/Hz

110/1/60 220/1/60

A

10.0 4.7

Starting method Capacitor-run

Bore

Output

Maximum discharge

mm (in.)

kW (Hp)

m (ft.)

80 (3.2)

0.75 (1)

19 (62)

head

Maximum flow rate

Maximum pressure

Solid size capacity

Weight*

L/min

(GPM)

kg/cm2 (psi)

mm (in.)

Kg (lbs.)

230 (60)

1.79 (25.5)

7 (0.27)

19 (42)

*The weight (mass) given above is the operating weight of the pump itself, not including the cable

assembly.

30 wc_td000296gb.fm

PST3/PSTF3 750 Technical Data

4.3 Dimensions

340***

(13.5)

185

(7.3)

90*

(3.5)

135

(5.3)

285

(11.2)

98

(3.9")(3.9")

(3.9)

92

(3.6)

92

(3.6)

184

(7.2)

317

(12.4)

233

(9.2)

80
(3)

217

(8.5)

109

(4.3)

*Start range

** Stop range

*** Minimum

**** Maximum

388

90

(3.5)

388

(15.3)

(15.3)

241

(9.5)

109

(4.3)

3"

45°

PST3 750 PSTF3 750

445****

40**
(1.6)

(17.5)

180***

(7.1)

wc_gr005670

wc_td000296gb.fm 31

Important: For spare parts information, please see your Wacker Neuson Dealer, or visit the
Wacker Neuson website at http://www.wackerneuson.com/.

Wichtig! Informationen über Ersatzteile erhalten Sie von Ihrem Wacker Neuson Händler oder
besuchen Sie die Wacker Neuson Website unter http://www.wackerneuson.com/.

Important : Pour des informations sur les pièces détachées, merci de consulter votre
distributeur Wacker Neuson, ou de visiter le site Internet de Wacker Neuson sur
http://www.wackerneuson.com/.

Importante : Para saber más sobre las piezas de repuesto, póngase en contacto con su
distribuidor de Wacker Neuson o acceda al sitio web de Wacker Neuson en
http://www.wackerneuson.com/.

Importante : Per informazioni sui pezzi di ricambio, contattare il rivenditore Wacker Neuson o
visitare il sito di Wacker Neuson all’indirizzo www.wackerneuson.com.

Viktigt : För information om reservdelar, kontakta din Wacker Neuson-leverantör eller besök
Wacker Neusons webbplats på http://www.wackerneuson.com/.

Tärkeää : Pyydä varaosatietoja Wacker Neusonin jälleenmyyjältä tai vieraile Wacker Neusonin
web-sivustolla osoitteessa http://www.wackerneuson.com/

Viktig : For informasjon om reservedeler, vennligst kontakt din Wacker Neuson-forhandler, eller
besøk Wacker Neusons nettside på http://www.wackerneuson.com/.

Vigtigt : Hvis du ønsker oplysninger om reservedele, bedes du kontakte din Wacker Neuson
forhandler eller besøg Wacker Neuson websiden på http://www.wackerneuson.com/.

Belangrijk! Neem contact op met uw Wacker Neuson dealer of bezoek de website van Wacker
Neuson op http://www.wackerneuson.com/ voor meer informatie over reserveonderdelen.

Importante : Para obter informações sobre as peças sobresselentes, consulte o seu
fornecedor da Wacker Neuson ou aceda ao site Web da Wacker Neuson em
http://www.wackerneuson.com

Ważne : W celu uzyskania informacji na temat części zamiennych skontaktuj się z
przedstawicielem firmy Wacker Neuson lub skorzystaj z witryny internetowej
http://wackerneuson.com/.

Důležité upozornění! Pro informace o náhradních dílech, prosím, kontaktujte svého Wacker
Neuson dealera, nebo navštivte webové stránky http://www.wackerneuson.com/.

FONTOS: A pótalkatrészekre vonatkozó információkért kérjük, forduljon Wacker Neuson
kereskedőjéhez vagy látogasson el a Wacker Neuson weboldalára a következő címen:
http://www.wackerneuson.com/.

Важно! Для ознакомления с информацией о запасных частях, пожалуйста, обратитесь к
местному торговому представителю компании Wacker Neuson или посетите веб-сайт

http://www.wackerneuson.com/.

Σημαντικό : Γι

α πληροφορίες σχετικά με τα ανταλλακτικά, μιλήστε με τον αντιπρόσωπό σας της

Wacker Neuson, ή επισκεφθείτε τον ιστότοπο http://www.wackerneuson.com/.

Važno : Za rezervne dijelove obratite se svom Wacker Neuson prodavaču ili posjetite mrežne
stranice tvrtke Wacker Neuson: http://www.wackerneuson.com/.

Önemli : Yedek parça bilgileri için Wacker Neuson Bayinize bakın veya Wacker Neuson web
sitesini ziyaret edin. http://www.wackerneuson.com/

重要 交換部品の情報については、ワッカーノイソンディーラーにお問い合わせ頂くか、ワッ
カーノイソンウェブサイト http://www.wackerneuson.com/ をご覧ください。

重要 有关备件信息，请咨询您的威克诺森经销商或访问威克诺森网站：
http://www.wackerneuson.com/。

Important : Pentru informaţii referitoare la piesele de schimb, vă rugăm să vă adresaţi
distribuitorului Wacker Neuson sau să vizitaţi site-ul web Wacker Neuson la adresa
http://www.wackerneuson.com/.

Важно : За информация относно резервни части, моля, обърнете се към местния дилър
на W

acker Neuson или посетете уебсайта на Wacker Neuson на адрес

http://www.wackerneuson.com/.

Wacker Neuson Produktion GmbH & Co. KG, Preußenstraße 41, D-80809 München,

Wacker Neuson Production Americas LLC, N92W15000 Anthony Ave., Menomonee Falls, WI. 53051

Wacker Neuson Limited - Room 1701–03 & 1717–20, 17/F. Tower 1, Grand Century Place, 193 Prince Edward

Road West, Mongkok, Kowloon, Hongkong. Tel: [phone], Fax: [phone]

Tel.: [phone] Fax: +49 - (0)89-3 54 02-390

Tel.: [phone] Fax: [phone] Tel.: [phone]