Maag S Series Instruction manual

Where Innovation Flows
S Series
Twin Screw Pumps
www.maag.com
IOM
Installation
Operation
Maintenance
Manual
MAAG–14000-E-02EMEA
REPLACES MAAG-14000-E-02
MAAG-14000-E

SECTION X
TABLE OF CONTENTS
SECTION 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PUMP FUNCTIONALITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PRODUCT WARRANTY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SECTION 2 RECEIVING, HANDLING & STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . 3
RECEIVING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LOADING AND UNLOADING.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
STORAGE AND PRESERVATION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SECTION 3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FOUNDATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PIPING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
PIPING SYSTEM ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
COUPLING ALIGNMENT.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DOWELING.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LUBRICATION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LUBRICATING GREASE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SECTION 4 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PUMP PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
STARTING THE PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RUNNING THE PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STOPPING THE PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
SECTION 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SECTION 6 ROUTINE & PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . .9
DAILY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
WEEKLY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
QUARTERLY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ANNUAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

MAAG-14000-E-02EMEA 1S SERIES TWIN SCREW PUMPS
SECTION 1
INTRODUCTION
FOREWORD
This manual is intended to assist those who are involved with
the installation, operation and maintenance of a Maag S Series
Pump. These instructions must be thoroughly reviewed in their
entirety and fully understood prior to pump installation, operation
or maintenance. Special attention should be given to pump
lubrication, heating, cooling and sealing during pump installation,
operation and maintenance.
Maag S Series Pumps include 2H, 2HE, 2HM, 2HR, 2HC, 2HH, 2MPS,
2VE and 2VM models.
PUMP FUNCTIONALITY
Maag S Series Pumps are rotary, positive displacementpumps
capable of handing various clean liquids containing no solids. The
pump is composed of two opposing sets of screws. During pump
operation, the screws located on the two shafts are engaged and
therein form a sealed cavity with the surrounding pump casing.
The pumped liquid is displaced axially as the screw shaft turns
steadily and constantly, allowing liquid to ow to the center of the
pump where the discharge port is located. Hydraulic force on the
two screws is both opposite and equal, allowing for hydraulic axial
stress on the screw shafts to be automatically balanced.
The pump’s suction opening for liquid is designed to ensure the
ow velocity changes constantly, resulting in reduced entrance
friction. The smaller the pump’s NPSH, the higher the pump’s
suction-lift capability. The unique construction (side-inlet and
side-outlet; side-inlet and up-outlet; shaft inlet and up-outlet)
allows the storage of liquid while the pump is not operating and
allows the pump to be in a self-priming state.
The pressure-limited valve protects the pump from excessive
pressure increases. The valve is actuated at a pressure of
approximately 1.5 bar (21.8 psi) above the maximum dierential
pressure and allows the medium to ow back to the intake
chamber. The pressure-limited valve cannot be used for capacity
or pressure control. This valve is suitable for single-direction
rotation pumps; otherwise, special valves should be used for
double-operation pumps.
Separate screw-shaft construction is adaptable according to
pump application intentions.The shafts are made of high-strength
alloy steel for greater strength while subject to higher power and
torque requirements. Various screw-material options are available
in order to meet any special application requirements.
Separately lubricated timing gears are used to transmit power
from the driving shaft to the idler shaft and to prevent metal
contact between the meshed, rotating screws, thereby increasing
the life expectancy of both the screws and shafts.
SAFETY PRECAUTIONS
This manual contains basic references that are to be observed
during pump transportation, installation, operation and
maintenance, and, therefore, should be kept as part of the
permanent pump records and readily accessible as a reference to
any person working or maintaining the pumping unit.
The instructions within this manual must be thoroughly reviewed
in their entirety and fully understood prior to pump installation,
operation or maintenance care.
These pumps have been designed for safe and reliable operation
when properly used and maintained in accordance with the
instructions contained within this manual. A pump is a pressure-
containing device with rotating parts that can be hazardous. Failure
to read and comply with installation, operation and maintenance
instructions will void the responsibility of the manufacturer and
may result in bodily injury or equipment damage.
NOTE: In addition to the Safety Precautions identied in this
section, special safety information is included within later chapters
where appropriate.
Markings and Instructions on Pump Unit
Direct instructional references regarding direction of rotation,
uid-ow orientation, safety warning, etc., are clearly marked on
the pump. Please observe and follow all indicated safety markings
and instructions.
NOTE: Failure to observe safety references can result in the
following dangers:
• Equipment failure
• Maintenance and service policies voided
• Environmental pollution due to hazardous substance leakage
• Personal endangerment as a result of electrical, mechanical
and chemical inuences
Qualified Personnel & Training
All persons installing, operating, maintaining and inspecting the
pumping unit must have the required qualications for work to be
performed. All instructions and safety markings must be observed,
understood and adhered to by all personnel working on or around
the pumping unit. If installation or operational knowledge is
inadequate, training must be provided. The scope of the personal
responsibilities, competency and supervisory duties must be
closely controlled by the purchaser of the pumping unit.
Safety References for Customers
All work performed on or around the pumping unit must be
completed by qualied personnel.
• Machine components that are either hot or cold must be
protected on-site to prevent personal endangerment.
• Safety markings on the pumping unit must not be removed
from the machine while the pump is running.
• Leakage of hazardous media (i.e., toxic, ammable, explosive,
etc.) must be collected in a way that no damage to personnel

S SERIES TWIN SCREW PUMPS 2MAAG-14000-E-02EMEA
SECTION X
INTRODUCTION
or environment occurs.
• If the pumped media is explosive, toxic or ammable, a
warning or alarm device must be installed, pump housing
must be well ventilated and the operating site must be a no
smoke/re zone.
• To prevent damage due to electricity, all electrical devices
must be safely protected, functional and controlled.
Pump must meet specified operating parameters
Unless there is written permission by Maag, the pump must not be
operated at higher parameters than specied. Adhering to these
specications is meant to prevent danger to persons and damage
to equipment.
Pump Monitoring
Suitable measuring devices must be installed to inspect and
control the pump during operation. Generally, pressure gauges
are to be installed on suction and discharge lines near the pump.
NOTE: A pipe safety valve is required in the discharge pipe of the
pump.
PRODUCT WARRANTY
Our warranty for shortcomings in the supply is laid down in our
delivery conditions. No liability will be undertaken for damages
caused by non-compliance with the operating instructions and
service conditions. If, at a later date, the operating conditions
change (e.g., dierent uid conveyed, speed, viscosity,
temperature or supply conditions), the pump must be checked by
a manufacturer’s representative and acted upon on a case-by-case
basis and determination will be made if the pump is suited for the
current application use.
Prior to leaving our factory, all pumps are subjected to a thorough
test run and performance test on a test stand. Only properly
operating pumps, achieving the pump’s specied performance
and assured by Maag, will leave the factory. Therein, compliance
with the following operating instructions ensures safe operation
and delivery.

MAAG-14000-E-02EMEA 3S SERIES TWIN SCREW PUMPS
SECTION 2
RECEIVING, HANDLING & STORAGE
RECEIVING
Place equipment in a controlled environment upon receipt.
Ordinary packing crates for the pump are not suitable to
withstand outdoor storage conditions beyond a 30-day
limit from date of delivery, not withstanding favorable/
unfavorable outdoor conditions. Improper storage can
damage the equipment, thus voiding product warranty.
Special long-term storage packing can be supplied by Maag
upon request.
It is at the client’s discretion to observe and relate the packing and
storage requirements in the Technological Agreement with Maag.
Parts and quality checkpoint.
Upon receipt of shipment, carefully check the pump, driver, spare
parts, accessories and documentation in accordance with the
supplied Packing List to ensure no components are missing or
damaged. The identity of any missing or damaged components
must be communicated to the carrier and Maag. Damage claims
should be made at the time of the receipt and check.
LOADING AND UNLOADING
STEP 1
For transportation purposes, use suitable lifting tools and
attach lifting hooks to places marked on packing. Strictly
observe applicable safety regulations for lifting heavy loads.
NOTE: Do not lift pump by bearing housing.
STEP 2
When lifting the pump, attach lifting hooks to outlet flanges
as seen in Figure 1.
STEP 3
When lifting the pumping unit (motor included), chain
should be attached to the hook of the base-plate. Make sure
that no pipes or attached auxiliaries are damaged. See Figure
2 for reference.
STORAGE AND PRESERVATION
Pump units are affixed to the skids on the inside of the packing
crates in order to help prevent damage from standard loading
and unloading. All pump openings are covered with blank flanges
or special protective caps to keep pump cavity clean and free of
debris.
If pump is not to be installed or operated immediately, or
if pump is to be installed, but not operated immediately,
the pump units must be preserved as indicated below:
STEP 1
Store in a clean and dry location.
STEP 2
Apply acid and resin-free grease to all internal parts of the pump.
STEP 3
Ensure blank flanges or special protective caps covering
pump openings are properly attached.
STEP 4
Coat preservatives on all exposed shaft elements and places
that are not protected by paint.
STEP 5
Cover the pump and driver with plastic or waterproof canvas.
FIGURE 1 PUMP LIFTING

S SERIES TWIN SCREW PUMPS 4MAAG-14000-E-02EMEA
SECTION 3
INSTALLATION
The following installation instructions are to assist in the proper
pump installation. Trouble-free operation of a pump begins with
proper installation practices and will also extend the life of your
pump. Should any questions arise during the installation process,
please contact the Maag Technological Service Department for
assistance.
LOCATION
The pump has been built to meet the requirements of a specific
capacity at a specific pressure. To meet these requirements,
consideration must be taken regarding the suction and discharge
sides of the pump during installation. This information must
be provided to Maag engineers by the purchaser and specified
according to the pre-planned location of the pump installation
site. If, after receipt, the location of the pump is changed and these
pre-planned conditions are altered, please consult Maag engi-
neers immediately to ensure safe operation of the pump.
An appropriate amount of space must be kept for laying the pump
foundation. This is a critical pre-condition for pump assembly and
disassembly, installation, operation and maintenance.
It is suggested to locate the pump as close as possible to the
source of the media supply. Ideally, the pump location should
be clean and dry with enough space to perform the installation,
maintenance and preservation.
NOTE: If it is necessary to install the pump in a pit or cavity,
measurements must be taken and considered in an effort to
prevent flooding or any other foreseeable challenge to the instal-
lation, maintenance or preservation of the pump.
FOUNDATION
Ground foundation should be suitable to absorb vibration and
provide rigid support for the entire pump unit. Generally, rein-
forced concrete is used as a foundation material.
The required area of the pump location and the location of anchor
(foundation) bolts can be defined accordingly to the pump unit
outline designation drawing supplied by Maag.
The proper measurement should be carried out to locate and hold
the anchor (foundation) bolts in the correct place while directly
pouring the concrete. Each bolt should be installed in a pipe
sleeve. The pipe sleeve’s inside diameter should be approximately
three to four times that of the outside diameter of the anchor bolt.
Two methods are commonly used to secure and prevent bolts
from turning (see Figure 3).
Option A: Weld a lug to the anchor bolt head to prevent bolt
turning (see Figure 4).
Option B: The bolt may be a rod construction, bent at 90 degrees
below the pipe sleeve. Pack the space between the anchor bolt
and the sleeve to prevent concrete or grout form entering this
area. Anchor (foundation) bolts must be long enough to allow
20 mm to 40 mm (0.79 in to 1.58 in) of space for grouting under
the base-plate. When pump is level, the bolts should extend 6 mm
to 10 mm (0.24 in to 0.4 in) through the screw nuts.
If the pump unit needs to be installed on a steel deck plate or
another structure, directly install the pump unit on the surface or
install as close as possible to the main structural parts, roof beams
or main walls. Support is needed to maintain the concentricity of
the pump and motor and to prevent damage caused by structures
or base-plates being out of shape.
Pour the liquid cement and sand to ll the space underneath the
base-plate. Mix the liquid through the pouring-hole on the base-
plate to remove any air in the liquid.
FIGURE 3 GROUTING
Top of Foundation
Grouting
Base-Plate
FIGURE 4 FOUNDATION
Pipe Sleeve
Foundation Bolt

MAAG-14000-E-02EMEA 5S SERIES TWIN SCREW PUMPS
SECTION X
INSTALLATION
PIPING SYSTEM
Since the pump’s basic operating parts are designed to be affixed
on the two screws, extremely close running clearances exist
between the screws and the body; therefore, it is very important
to have the piping (especially the suction-side piping) cleaned
thoroughly before connecting the piping to the pump flanges.
After the pump unit has been installed and secured on its
foundation, pipe connections may be installed.
NOTE: Please see pump outline drawing for location of all pipe
connections, flange sizes and other notes pertinent to piping.
Pipes should be as short and direct as possible. Use long radius
elbows to change direction when needed.
When laying the suction and discharge piping and other supply
lines, there must be at least 1.2 times the overall pump length
(without drive unit) in front of the gear casing of the pump.
Suction piping must be at least the same size of the inlet diameter; it
is acceptable if the suction pipes are one class larger than the inlet.
For example, if the size of the inlet is 150 mm (6 in), the suction
pipes should be 200 mm (8 in). The pipe diameter [length of pipe
should be four (4x) times that of the pipe’s diameter] is used to
connect the suction pipes and the inlet. Discharge piping should
be the same size as the diameter of the outlet.
All major piping parts, including suction pipes, discharge pipes,
valves and strainers, should be supported independently and
installed properly to avoid any unnecessary strain on the pump.
The piping flanges must be properly aligned with the pump
flanges. To check alignment, insert flange bolts through the pipe
and pump flange. If bolts are easily moved within the bolt holes
and if flange faces are parallel with each other, the piping is
properly aligned.
If the pump is required to operate with suction lift, the suction
piping system must be properly made in relation to the original
design.
NOTE: NPSHa of suction piping must be larger than pump's NPSHr.
The pump cannot be expected to overcome deficiencies in the
suction piping system, such as narrow/thin runs of suction piping,
numerous elbows, valves and excessively high points above pump
suction, etc. In such cases, cavitation will invariably occur and the
pump may not operate at normal capacity.
Pump and pump accessories should be kept apart by valves to avoid
any force while pressure testing or washing the piping system.
PIPING SYSTEM ACCESSORIES
SUCTION STRAINERS
Maag suggests that suction strainers be installed on the suction
side of the pump at least temporarily until the new system is
deemed clean of solid residue. The screen area of the strainer should
be as large as possible. Generally, the strainer screen should be
constructed of 40 meshes, and 20 or 10 meshes for high-viscosity
applications. The net screen area should be approximately
5 to 8 times the flow cross-sectional area of the suction pipe.
However, if the viscosity of the media is in excess of 200 mm2/s,
then approximately 10 to 20 times the pipe cross-sectional area
is suggested for the net screen area. The maximum differential
pressure is 0.1 bar (1.5 psi). The strainer on the suction side can be
used to prevent solids from entering into the pump and causing
damage to certain parts. Install pressure gauges on either side of
the strainer to indicate when the strainer should be cleaned. The
installed strainer should be easy to maintain and clean.
Generally, strainers can be used on all liquids except for those of
an extremely high viscosity. In these cases, the strainer cannot be
installed, therefore piping and accessory cleaning is mandatory.
CHECK VALVE
If the discharge piping system is subject to a high static head
and if the fluid handled flows back into the pump cavity when
stopping the pump, a check valve should be installed. This valve
will prevent hydraulic shock acting upon the pump, and most
importantly, it allows for separately starting the pump in a parallel
connection system.
PRESSURELIMITED VALVE
Pressure relief valves should be installed between the discharge
valve and the discharge flange of the pump in order to protect
both the pump and the piping systems. The relief valve should
match the pressure and capacity of the pump, and can lead
the released fluid back to the source of supply. As positive
displacement pumps, Maag pumps are equipped with a pressure-
limited valve to prevent pressure from building up. The starting
pressure of the pressure-limited valve should be 1.5 bar (21.8
psi) higher than the pump’s rated pressure. If the discharge pipe
is restricted or shut off, the pressure of the pump will build up
rapidly and the pressure-limited valve will be opened. However,
only when 30% to 50% of fluid is released back to the suction, will
the parts of the pump be protected from being badly damaged.
Therefore, all valves should be kept open while the pump is in
operation. The pressure-limited valve on the pump cannot be
adjusted by capacity or pressure.
GAUGES
A suitable meter must be installed to monitor and control the pump
while in operation. The vacuum gauge and pressure gauge can be
separately installed on the inlet and outlet piping near the pump.
COUPLING ALIGNMENT
Coupling angle deviation, radial deviation and axial clearance
should be kept at a minimum in order to prevent noises, vibration
and to reduce wear and tear on bearings and couplings.
NOTE: Coupling axial clearance, per specifications, should be
within 2 mm to 5 mm (0.08 in. to 0.2 in.). If using special coupling,
please consult with the manufacturer’s regulations.
Maag pump aggregate (including driver, base-plate and other
accessories) has been aligned (coupling) prior to delivery. However,

S SERIES TWIN SCREW PUMPS 6MAAG-14000-E-02EMEA
SECTION X
INSTALLATION
stresses caused by lifting, transporting and pipe connecting can
cause minor distortions that will disturb the alignment. Therefore,
realignment should be done while installing the pump after the
following:
Check coupling alignment after the base-plate has been leveled;
after the piping is connected, make a final pre-startup coupling
alignment check; if the product to be pumped is high in
temperature (for the first use), a hot coupling alignment should
be made once the pump has reached its operating temperature.
The driver should be installed and connected according to the
specific instructions provided by the motor manufacturer. During
installation, please note the connection requirements for the
motor and pump. The direction of rotation of the motor and
pump must be aligned with the arrow indicating the direction of
the rotation on the pump.
If the pump and drive unit are connected, the pump must be
primed with the medium prior to checking the direction of driver
rotation.
CAUTION: The pump must not run dry, or sealing will be damaged!
DOWELING
After the pump unit has been running for approximately one
week, the coupling must be checked for possible misalignment
caused by pipe strain or temperature strain. This check must be
made immediately after the pumping unit is shut off, before it has
a chance to cool. If alignment is correct, the driver must now be
doweled on diagonal feet.
LUBRICATION
For all Maag Twin Screw Pumps, lubricating oil and/or lubricating
grease are used for lubricating the bearings and gears of the
pump (see Figure 5).
LUBRICATING OIL
Gear oil in the gear box is used to lubricate and cool timing
gears of the pump and to splash-lubricate roller bearings. Maag
suggests using the same type of high-grade gear oil with anti-
foaming agents, oxidation and corrosion inhibitors, and an abra-
sion-resistant agent. It is suggested that the gear oil meet the
following requirements:
ISO 150 VG
Viscosity at 50°C 80 – 165 cSt
Flash Point 190ºC – 200°C (374ºF – 392ºF)
The general gear oils that Maag suggests using are:
Mobil Industrial Gear Oil, No. 120#
The Great Wall Industrial Gear Oil, No.150#
The frequency at which the gear oil should be replaced:
New Pump Accumulative Total 260 hours
Intermittent Running Accumulative Total 600 -1,200 hours
Continuous Running Accumulative Total 2,200 hours
When the pump is running, the oil level should be maintained at
the center of the sight glass, the lowest location should be seeable
from the sight glass. When the pump is not running, the oil level
should not exceed the highest location of the sight glass.
LUBRICATING GREASE
Lubricate the double-row angular contact ball bearing by injecting
grease into the bearing using an oil gun or an oil canister.
NOTE: Under normal operating conditions, apply grease once per
800 accumulated hours.
Use the same type of grease for every application. If the operating
temperature is too high or if the load is too heavy, please consult
the manufacturer of the grease that is being used.
FIGURE 5
1 Lubricating Oil Inlet 2 Grease Inlet
2
1
2

MAAG-14000-E-02EMEA 7S SERIES TWIN SCREW PUMPS
SECTION 4
OPERATION
PUMP PREPARATIONS
The nal pre-startup check is very important to avoid operational
diculties. Listed below are several key components to be checked
prior to pump operation:
STEP 1
Inspect all piping. Check individual piping support; check for leaks
and unnecessary piping strain on the pump; ush all piping to
ensure removal of foreign material from the system; check that
all valves and gauges are functional; check mesh-size suitability.
STEP 2
Ensure pump cavity is lled with pump uid.
STEP 3
Check that oil is at the proper level in the gear housing. Excessive
oil will cause the gear box to overheat (see Figure 6).
STEP 4
Check pressure gauges and all other meters.
STEP 5
Check all electrical equipment (i.e., cables, control lines and
accessories).
If pump is jacketed for heating, heat the pump casing to the
prescribed temperature. Steam, hot water and hot oil can
be used as a heating medium. According to the dierent
materials of the pump casing, select proper pressure for
heating medium within the limit of 2.0 to 8.0 bar (29.0 to
116 psi). Inlet and outlet are located on the pump casing;
therefore, the thermal dierence between pumped uid
and heating medium should be as small as possible in order
to avoid generating internal stress. Especially for cast-iron
pumps, the thermal dierence between the pumped uid
and the heating medium should be less than 50°C (122ºF).
If the pump is installed with a double mechanical seal, then
sealing the liquid system is required. The pressure for sealing the
liquid system should be 1.0 to 2.0 bar (14.5 to 29.0 psi) higher
than that of the pump suction chamber. All rules and regulations
regarding sealing the liquid system should be adhered to as
described in the Sealing Liquid System Instructions.
STEP 6
Check rotation shafts by rotating the coupling by hand to
determine whether the pump shafts and motor shaft turn
freely. If any rubbing or binding occurs, the cause must be
located and corrected before starting the pump.
STEP 7
Check that motor rotation is correct; refer to the rotation
directional mark located on the pump.
STARTING THE PUMP
STEP 1
Open the suction and discharge valves wide in order to keep
the entire piping system unobscured.
NOTE: Ensure that all valves and devices on the suction and
discharge sides are opened before starting the pump.
STEP 2A
If pump is installed with a heating jacket, introduce heating
medium and heat the pump to the temperature as described
in previous section.
STEP 2B
If pump is equipped with double mechanical seals, introduce
sealing liquid and monitor the sealing liquid system.
STEP 3
Rotate the coupling by hand to determine if rubbing or
binding occurs.
STEP 4
Start motor/driver.
STEP 5
The pump must be stopped if there is no capacity after
starting. Restart the pump after several minutes. If there is still
no capacity, the cause must be determined. Please refer to the
Troubleshooting section of this manual for further instruction.
RUNNING THE PUMP
STEP 1
Check the pumping unit for unusual noise or vibration. Any
unusual vibration or change in sound must be investigated
and corrected to normal operating conditions.
STEP 2
Check bearing housing temperature. Bearing temperature
can safely rise to between 65°C and 75°C (149ºF and 167ºF).
Pumped medium or spot environmental temperature should
be considered when determining whether temperature
exceeds normal operating conditions.
Bearing temperature up to 90°C (194ºF) is considered to be normal.
Within this limit, the stability of the temperature is the best indicator of
normal operation. A sudden increase in temperature indicates that a
bearing problem is developing and the bearing should be checked
immediately.
CAUTION: Do not attempt to measure the temperature by hand!
STOPPING THE PUMP
STEP 1
Stop the motor and pump.
STEP 2
Close suction and discharge valves.
STEP 3
If pump is installed with a heating device, stop the heating
device rst, then close the sealing system after cooling.
FIGURE 6 Oil Level of the Gear Casing
max min

S SERIES TWIN SCREW PUMPS 8MAAG-14000-E-02EMEA
SECTION 5
TROUBLESHOOTING
BELOW
CAPACITY
NO
CAPACITY
EXCESSIVE
DRIVER
TEMP.
INCREASE
IN NOISE OR
VIBRATIONS
SHAFT
DOES NOT
TURN
TROUBLESHOOTING
•No medium is stored within the pump.
• Re-introduce the appropriate amount of pumped medium.
• • • Suction pipes leak.
• Check all direct connecting pipes between suction pipes and discharge pipes.
• • •
Insucient suction conditions.
• Check piping. If the velocity of ow is too fast, the diameter of the pipes should be enlarged;
if the viscosity of the medium is too high, heating measure should be taken.
• Clean the strainer if blocked.
• • • Directional ow in suction piping changes suddenly.
• Valve’s apertures are not functioning properly, and cavitation has most likely occurred.
• Completely open valves in order to correct pipeline.
• • Space between screws, screw and casing are enlarged causing wear and tear.
• Replace worn parts.
•Large foreign matter or impurities among moving parts.
• Counter-rotate pump shafts, remove foreign matter or impurities.
• If necessary, disassemble the pump and perform a maintenance check.
•Internal components expand when overheated.
• Rotate pump shafts by hand after cooling down.
• Restart pump.
•••Bearing is broken or there is a lack of oil in gear housing.
• Disassemble the pump to replace broken bearing when it is necessary.
• Add gear oil per instructions previously described within this manual.
•Incorrect direction of rotation.
• Reverse the directional rotation of the driver.
•••Incorrect coupling alignment.
• Realign coupling.
•
The pump revolving speed (N) is too low.
• Check motor.
• Determine cause of low motor speed. Refer to manufacturer’s instructions to increase
revolving speed.
• • Discharge pressure is greater than operating pressure of pump, and the recycle valve has opened.
• Decrease discharge pressure.
• • Mechanical seals leak.
• Check and replace mechanical seal.

MAAG-14000-E-02EMEA 9S SERIES TWIN SCREW PUMPS
SECTION 6
ROUTINE & PREVENTIVE MAINTENANCE
For special or custom pumps, please refer to the maintenance
instructions within this manual.
DAILY MAINTENANCE
STEP 1
Check oil level in gear box. If necessary, disassemble screw
plug from the top of the gear box and apply oil to the center
of the sight glass.
STEP 2
Listen for unusual noise or vibration.
STEP 3
Inspect pump shaft seal for leaks when pump is running.
Regarding mechanical seal installation, product vaporizes
resulting in no observable leakage; however, for some
applications, a modest amount [3 mL/h (0.10 oz/h) to 5 mL/h
(0.17 oz/h)] of leakage is acceptable.
Coupling/Special Coupling: Please refer to Manufacturer’s Special
Instructions in the Appendix.
Driver: Please refer to Manufacturer’s Special Instructions in the
Appendix.
Special Accessories: If pump is provided with special accessories,
for instructions regarding the maintenance of these accessories,
please refer to Manufacturer’s Special Instructions in the Appendix.
WEEKLY MAINTENANCE
STEP 1
If pump is not in use for one week, open suction and
discharge valves, run idle pump under power.
STEP 2
Check operation of suction and discharge valves.
QUARTERLY MAINTENANCE
STEP 1
Check all foundation bolts, screws and hold-down bolts for
tightness.
STEP 2
Change oil as previously described in this manual. Turn open
draining screw plug of the gear housing, disassemble oil-input
screw plug and inject clean, light oil into resin gear box.
Tighten screw plug, inject gear oil to the level of the sight
glass and tighten oil-input screw plug. Add grease for fore-
bearing housing as previously described in this manual.
ANNUAL MAINTENANCE
STEP 1
Check coupling alignment.
STEP 2
Check existing pump capacity, pressure and power
against pump and motor nameplate data. If pressure and
capacity have decreased excessively, the pump should be
disassembled and worn parts should be replaced. However, if
pump performance is satisfactory, disassembly for inspection
is not required.

SECTION X
NOTES

SECTION X
NOTES

SECTION X
NOTES

SECTION X
WARRANTY
Item # Serial #
Company Where Purchased
Company Name
Industry
Name Title
Street Address
City State Postal Code Country
Telephone Fax Email Web Address
Number of pumps in facility? Number of Maag pumps?
Types of pumps in facility (check all that apply): Diaphragm Centrifugal Gear Submersible Lobe
Other
Media being pumped?
How did you hear of Maag Pump? Trade Journal Trade Show Internet/Email Distributor
Other
PUMP INFORMATION
PLEASE PRINT OR TYPE AND FAX TO MAAG
Maag, a Dover Company, warrants its products free from defects in materials and workmanship under normal use
and service for which its products were designed. This warranty is for a period of 12 months after installation or
18 months after shipment from the factory, whichever comes first. This standard warranty applies unless specific
warranty conditions are granted in writing by Maag. If its products should fail through defect in workmanship or
material within the stated warranty period, Maag must be notified in writing within the warranty period of such
defects and shall have the option of requiring return of parts or product to its factory for verification of any claim. The
warranty is in lieu of any other liability for defects.
MAAG MAKES NO WARRANTY OF MERCHANTABILITY AND NO WARRANTY THAT ITS PRODUCTS SHALL BE
APPROPRIATE FOR ANY PARTICULAR PURPOSE, nor are there any other warranties, expressed or implied, by
operation of law or otherwise. This warranty does not cover any expense (labor, lost production, travel expenses,
etc.), incurred in repairs or alteration made outside the Maag factory without prior authorization, nor does it cover
in any way the performance of equipment which has been revised or altered by others. The customer is wholly
responsible for establishing the suitability of the product for his particular application and for operating conditions,
which do not exceed published product limitations. Maag shall not be liable for damages or delay resulting from or
related to defective products, nor for consequential, special or contingent damages for breach of warranty.
YOUR INFORMATION
ONCE COMPLETE, FAX TO [phone]

PSG reserves the right to modify the information and illustrations contained in this document without prior notice. This is a non-contractual document. 08-2013
Where Innovation Flows
Aspstrasse 12
8154 Oberglatt Switzerland
O: [phone]
F: [phone]
www.maag.com
ABAQUE®
PERISTALTIC PUMPS
mouvex.com
ALMATEC®
AIROPERATED
DOUBLEDIAPHRAGM PUMPS
almatec.de
AUTOMATIK
PELLETIZING SYSTEMS
maag.com
BLACKMER®
VANE PUMPS & COMPRESSORS
blackmer.com
FLUID DYNAMICS™
POLYMER BLENDING SYSTEMS
uiddynamics1.com
GRISWOLD™
CENTRIFUGAL PUMPS
griswoldpump.com
MAAG
FILTRATION
PLASTIC MANUFACTURING &
PROCESSING FILTRATION
maag.com
MAAG
INDUSTRIAL PUMPS
GEAR & SCREW PUMPS
maag.com
MAAG
PUMP SYSTEMS
EXTRUSION PUMPS & SYSTEMS
maag.com
MOUVEX®
ECCENTRIC DISC PUMPS,
VANE PUMPS &
COMPRESSORS
mouvex.com
NEPTUNE™
DIAPHRAGM METERING PUMPS,
POLYMER SYSTEMS & MIXERS
neptune1.com
QUATTROFLOW™
QUATERNARY DIAPHRAGM
PUMP TECHNOLOGY
quattroow.com
REDSCREW™
SCREW PUMPS
redscrewpump.com
SYSTEM ONE®
CENTRIFUGAL PUMPS
blackmer.com
WILDEN®
AIROPERATED
DOUBLEDIAPHRAGM PUMPS
wildenpump.com
PSG® Brands
Copyright ©2013, Pump Solutions Group (PSG), A Dover Company
Authorized PSG Representative: