ROTOS PTM Series User manual

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SERIES PTM
TURBINE PUMPS
PLASTIC
SEAL LESS MAGNETIC DRIVE
INSTRUCTION MANUAL
FOR THE INSTALLATION
& OPERATION
& MAINTENANCE

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To obtain the best performance from your ROTOS pump, please read these instructions
carefully. Failure to observe the recommended procedures may result in damage to your ROTOS
pump, and may also invalidate the supplier's guarantee.
REMARKS ON THE USE OF THE PUMP PERFORMANCES CURVES
REGENERATIVE TURBINE MAGNETIC DRIVE PUMPS
1. Pump performances are guaranteed by ROTOS with manufacturing clearances according
to UNI 9902 Cl.II Appendix A specification. If the pumps are to be subjected to any other
specification requiring closer tolerances, this must be pointed out when a quotation is
requested. In such cases, the manufacturer ROTOS will select the required pump model
and will state the guaranteed tolerances.
2. Performances are valid for homogeneous liquids with specific gravity of 1 Kg/dmc.
If the liquid has a specific gravity different from 1, the actual power consumption will be
the one shown in the curve multiplied by the specific gravity.
For liquids having S.G. higher than 1,9 ask the manufacturer ROTOS.
3. Performances are valid for homogeneous liquids with viscosity of 1 cps.
If the liquid has a viscosity different from 1, the Q/H curve will be altered, also efficiency
decreases. For liquids having a viscosity lower than 0.5 cps, or, higher than 150 cps ask
the manufacturer ROTOS.
4. The NPSH values given in the curves are the lowest required values. As a rule the NPSH
value available on the plant should be, at least, 0.6 m higher of the NPSH value required
by the pump and stated on the performances curves.
5. The given efficiency is achieved by pump-prototypes; efficiency might result lower with
cast steel, stainless steel and special alloy constructions and standard production in series.
Reduce as follows : pumps with discharge nozzle up to 25 mm 3 % points
pumps with discharge nozzle over 25 mm 2 % points
6. MAXIMUM ADVISED TEMPERATURES ARE:
Plastic Pumps: 65°C - 80°C for pumps made of Polipropilene PP.
85°C - 95°C for pumps made of Polyvynilidenfluoride PVDF
(first value is referred to a continuous service. Second value is referred to an intermittent service)
7. If, for any technical reason, hydraulic required power is higher than the maximum
allowed motor power, the selected pump is not suitable for the application; please contact
the manufacturer ROTOS. [e-mail]

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8. ATTENTION: For plastic pumps, flanges, connections and piping on the
suction and discharge flange must be made in plastic and must be connected
to the pump carefully and without the use of strenght.

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THIS INSTRUCTION MANUAL is intended to guide those responsible for the installation,
operation and maintenance of ROTOS PTM
Please read it carefully, before you install and operate your ROTOS
pump.
ROTOS PTM –SERIES PUMP PRESENTATION
!

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W A R N I N G
WORKING WITH STRONG MAGNETS ESSENTIAL
PRECAUTIONS
1
Magnets can produce strong mechanical forces.
2
There is a danger of injury when two magnets are brought together by hand.
3
Magnets are brittle and are easily damaged. Breakage can occur when a
magnet is placed near another magnet or iron object without mechanical
guidance and special care.
4
If magnetic particles get into the eyes, get medical help immediately.
5
Heart pacemakers can be damaged.
6
Tools or other iron objects can be attracted suddenly.
7
Credit cards etc with magnetically stored information can be damaged.
8
Watches can be damaged.
!

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INDEX
1. WHEN RECEIVING YOUR ROTOS PUMP
2. PUMP FOUNDATION
3. PUMP AND MOTOR ALIGNMENT
4. LOCATION AND PIPING
5. ELECTRICAL CONNECTION AND PROTECTION AGAINST DRY RUNNING
6. ROTATION CHECK AND PREPARATION FOR START-UP
7. PRIMING THE PUMP
8. PUMP OPERATION
9. MAINTENANCE SCHEDULE
10. DECOMMISSIONING THE PUMP-(Anti-frost precautions)
11. DISASSEMBLING THE PUMP-(Precautions when working with strong magnets)
12. INSPECTION PRIOR TO REASSEMBLY
13. REASSEMBLING THE PUMP
14. PUMP PROBLEMS: CAUSES AND REMEDIES
15. SECTIONAL DRAWING
16. PART LIST
17. SECTIONAL DRAWING
18. PART LIST

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1. WHEN RECEIVING YOUR ROTOS PUMP
1Check the nameplate on the pump against the receiving and purchase order documents to be sure
that the correct size of pump and materials of construction have been supplied. If a motor has
been supplied, check that the power, speed, and voltage are correct.
1.1 Prior to unpacking, check for physical damage to the packing and the pump unit and notify the
forwarding agent IMMEDIATELY if any damage is found.
1.1.1 Check that the port covers are intact. If not, check whether foreign objects may have found their way
into the pump casing through the ports. Remove the port covers only when you are ready to connect
the pipes to the pump.
1.1.2 When shipped, the pumps are suitable for short-term storage only. If long-term storage is necessary
before the pump will be put into operation, we suggest that you contact your pump supplier for long-
term storage recommendations.
1.1.3 Check for free rotation of the pump. If the pump is close-coupled to the motor, remove the fan cover
from the motor and rotate the fan by hand. To check long-coupled pumps for free rotation, remove
the coupling guard and rotate the pump and motor shafts at the flexible coupling.
2. PUMP FOUNDATION
The foundation should be substantial in order to reduce vibrations, and rigid enough to prevent
flexing which can result in mis-alignment. Foundation bolts of the correct size should be located by
reference to certified drawings if the baseplate is supplied with the pump.
2.1 The pump must be mounted horizontally on a level foundation, with the discharge port vertically
upwards.
2.2 Close-coupled motor-pump units without baseplates
Level the pump base accurately, using shims under the pump feet. The pump must sit firmly and
evenly on its foundation. It must not be distorted by bolting to an uneven surface.
2.3 Motor-pump units on baseplates
Level the baseplate accurately, using shims under the base-plate next to the foundation bolts. The
baseplate must sit firmly and evenly on its foundation: it must not be distorted by bolting to an
uneven surface, which will throw the pump and motor out of alignment.

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3. PUMP AND MOTOR ALIGNMENT
3.1 Close-coupled pumps have been aligned prior to shipment and if they turn freely by hand, no
further adjustments are necessary.
3.2 Long-coupled pumps have been pre-aligned with the motor prior to shipment. If pump units receive
rough treatment during shipment, they can become mis-aligned. The flexible coupling is not
designed to compensate for mis-alignment. Improper alignment will cause vibration and premature
bearing failure.
3.2.1 CHECK THE ALIGNMENT OF PUMP AND MOTOR BEFORE START-UP.
A final alignment check should be made after the baseplate has been grouted and set, and the foundation
bolts have been tightened.
Couplings should be aligned within the following limits:
COUPLING TYPE
OFFSET
ANGULARITY
Displacement
Gap
Short flexible coupling
(3000 rpm)
0.05mm
0.04mm per 100mm
coupling diameter.
Flexible spacer coupling
(3000 rpm)
0.07mm per 100mm spacer length.
0.04mm per 100mm coupling
diameter.
LEVEL
F
FO OU UN ND DA AT TI IO ON N B BO OL LT TS S

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3.2.2 Methods of checking alignment
a. Straight edge
Using a straight edge, check the distance from the shaft at several points on the circumference of the
coupling. The distances d1 and d2 should each remain constant.
IMPORTANT NOTE:The straight edge method checks static coupling alignment, not shaft
alignment. It relies for its accuracy on the accurate alignment of each coupling half on its shaft. The
straight edge method is a useful preliminary check, but should not be seen as an effective final
alignment method.
b. Dial gauge ("clocking")
There are several methods, using one or two dial gauges. The lost accurate is the reverse indicator
method, using two gauges, which overcomes errors due to `sag' of the gauge bars.
c. Optical methods
Several proprietary systems are available, such as the `OPTALIGN' system (INA Linear Systems).
Mechanical errors are eliminated by optical alignment techniques. On request, your pump supplier
can provide further information about suitable alignment methods, including allowances for
THERMAL EXPANSION IN HIGH TEMPERATURE USE.
4. LOCATION AND PIPING
4.1 The correct pipework sizes should be selected according to the allowable limits of liquid velocity
and pressure drop at the required flow rate. Check the NPSH required by the pump at its specified
duty point, and ensure that the minimum NPSH available exceeds that required.
This is particularly important for liquids near their boiling temperature (or bubble point).
4.2 Check that the pipework is THOROUGHLY CLEAN before the pump is installed.
4.3 Pipework connections must be accurately aligned with the pump ports, so that they can be connected
to the pump without forcing. Maximum allowable bending moments are set out in the Tables on
pages 4/5. These moments must not be exceeded, otherwise the pump may distort internally, or the
pump and motor may become mis-aligned. Pipework must be fully and independently supported as
close as practicable to the pump.

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Locate the pump as close as possible to the liquid source.
4.4 The suction line should be as short and straight as possible, with a minimum number of bends.
Bends should be radiused: avoid sharp elbows. Bends and fittings should be no closer than 20 pipe
diameters to the pump suction, to allow undisturbed flow to the pump impeller.
4.5 Liquid velocity in the suction line should normally be between 0.7 and 2.0m/sec. If the liquid is near
its boiling temperature (or bubble point), its velocity may need to reduced to 0.5-1.0m/sec. If the
suction line is oversized, the reducer at the pump inlet port should be ECCENTRIC, not concentric.
4.6 Generally, suction piping should be one or two sizes larger than the inlet bore of the pump, to keep
liquid velocity low and friction losses to a minimum. This becomes more important as the distance
between the pump and the liquid supply increases.
4.7 The suction line should slope so as to avoid air pockets.
Valves on the suction side should be mounted with stems horizontal, or vertically downwards. All
joints in the suction line must be tight, to prevent air from entering into the system, with the risk of
vapour locking.
If the pump is installed with a negative static inlet head (lower diagram), the foot valve/ strainer
must always be immersed at a sufficient depth to avoid entry of air into the pump. Take suitable
precautions to prevent vortexing in the supply vessel
A pressure gauge should be installed in the suction line, as close as possible to the pump.
ATTENTION !
!

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4.8 If the supply vessel is under vacuum, a pressure balancing line should connect the supply vessel and
the pump inlet port.
4.9.1 The discharge line should be as short and direct as possible to minimize friction losses. An air vent
(if permissible) should be installed at the first high point in the discharge line.
4.10 A check valve and gate valve should be installed as close as possible to the pump discharge nozzle.
The check valve is installed to protect the pump from excessive back pressure or reverse flow
rotation, and to prevent back flow into the pump during shut down. The discharge (gate) valve is
used to regulate the flow. The check valve should be installed between the pump and the discharge
valve to allow the pump to be removed from service without emptying the discharge line.
4.11 A pressure gauge should be installed on the discharge side of the pump as close as possible to the
discharge nozzle.
4.12 If the pump is fitted with a STEAM HEATING JACKET, the steam must flow into the upper
connection and out of the lower connection. The heating fluid may be water with a maximum
temperature of 170oC or saturated steam with a maximum pressure of 7 bar (100psi).
4.13 Prior to starting the pump it is important to flush the piping to make sure that the system is free of
solids such as pipe scale, welding beads, and dirt. TEMPORARY START-UP STRAINER (40 mesh
screen) should be installed in the suction line. BE VERY CAREFUL not to allow the temporary
strainer to become plugged, causing low inlet pressure with cavitation or dry running. A pressure
gauge should be installed on either side of the temporary strainer to measure the pressure drop across
it. If there is any risk of solids particles during normal operation, once the pump has been
successfully commissioned, a PERMANENT INLET STRAINER should be fitted in the inlet line.

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AVOID PUMPING LIQUIDS CONTAINING SUSPENDED SOLIDS
Standard Rotos pumps are designed to handle clean liquids. Unless specifically agreed prior to
purchase of the pump from your supplier, suspended solid matter must be kept out of the pump by a
suitable inlet strainer. The strainer mesh size should be less than 0.5mm, with an open surface area at
least 2.5 x nominal cross-sectional area of pump inlet bore.
The strainer must be inspected regularly and cleaned when necessary.
DO NOT PUMP LIQUIDS CONTAINING IRON OXIDES OR FERROMAGNETIC
PARTICLES, HOWEVER SMALL. THESE MAY ADHERE TO THE INTERNAL
MAGNET AND CAN EVENTUALLY BUILD UP INTO DAMAGING DEPOSITS.
4.12 Protecting the pump against DRY RUNNING
The pump must NOT be allowed to run dry. Dry running will result in loss of liquid film to the bearings,
causing over-heating and eventual bearing failure, leading to seizure of the pump.
Avoid the following conditions:
a. Loss of liquid supply. Ensure that an adequate supply of liquid is available at the pump inlet at all
times. Pressure and/or flow sensors should be installed if necessary, to monitor the hydraulic
conditions in the inlet pipework.
b. Low inlet pressure due to restriction or blockage of the inlet pipework, causing liquid vaporization
and cavitation in the pump, with the risk of loss of liquid film in the bearings.
c. `Dead-heading' If the pump is permitted to run against a closed discharge for more than a short time
(depending on the liquid, the duty, and the pump model and power), the liquid in the pump casing
will heat up and evaporate with consequences as in b. above.
4.13 Electronic dry-running protection
A rapid and reliable method of stopping a centrifugal pump, in the event of loss of liquid supply or
interruption of flow, is to monitor the power output of the motor. The `EL-FI' device monitors both
current and phase angle, providing pump protection without pipework sensors or attachments. It is
easily fitted in the power supply to the motor, in place of a normal starter. Details of power monitors
are available on request from your pump supplier.
ADMISSIBLE EXTERNAL FORCES AND TORQUES ON PUMP FLANGES AND PORTS
PLASTIC PUMPS ARE ALLOWED TO BE CONNECTED WITH PLASTIC PIPES. IN THE CASE OF
CONNECTION WITH METALLIC PIPES, THOSE MUST BE FULLY SUPPORTED IN ORDER TO
AVOID ANY LOAD ON THE FLANGES.
WHEN TIGHTENING FLANGE BOLTS or THREADED PIPING, EXTREME CARE MUST BE USED
IN ORDER NOT TO STRESS COMPONENTS OF THE PUMP LIKE FLANGES AND THREADS
!
!

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5. ELECTRICAL CONNECTION
The electrical connection to the motor should be carried out by a properly qualified electrician, using
cable, cable glands and connection procedures suitable for the electrical load and for the location of
the installation.
All regulations governing electrical installations in HAZARDOUS AREAS must be strictly
followed. It is the responsibility of the pump user to ensure that a safe electrical installation is made
and maintained.
5.1 Connecting the electric motor
5.1.1 Insulate the electric supply cable from the power supply.
5.1.2 Bring the cable end into the terminal box through a suitable cable gland.
5.1.3 Follow the motor manufacturer's instructions for electrical connection. These will normally be found
inside the terminal box. Check that the terminal links are correctly positioned for the supply voltage.
Ensure that the earth connection is properly and securely made.
5.1.4 Before replacing the terminal box lid, check that the sealing surfaces and the gasket or 0-ring seal
are clean and in good condition. With flameproof electric motors, the opposing metal surfaces of the
terminal box seal should be lightly greased to keep out condensation and prevent corrosion.
5.2 A proper electrical starter must be used. A starter will:
a. prevent accidental restarts after power failure
b. provide a safe, waterproof switch enclosure (IP55 `hose-protected' specification)
c. protect the motor with a correctly set thermal overload cut-out a fuse protects wiring only.
d. withstand the heavy starting current of the motor, preventing arcing and rapid contact wear.
b) Start the pump briefly to check the direction of running. The motor should rotate in the direction shown,
viewed from in front of pump.

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T
TO O A AL LT TE ER R T TH HE E D DI IR RE EC CT TI IO ON N O OF F R RO OT TA AT TI IO ON N O OF F A A T TH HR RE EE E- -P PH HA AS SE E M MO OT TO OR R C CH HA AN NG GE E A AN NY Y T TW WO O
C
CO ON NN NE EC CT TI IO ON NS S. .
F
FO OR R A A S SI IN NG GL LE E P PH HA AS SE E M MO OT TO OR R, , R RE EV VE ER RS SE E T TH HE E P PO OL LA AR RI IT TY Y O OF F T TH HE E S ST TA AR RT T W WI IN ND DI IN NG G I IN N R RE EL LA AT TI IO ON N
T
TO O T TH HE E M MA AI IN N W WI IN ND DI IN NG G
NOISE LEVELS
The following table reports the noise level produced by PTM pumps running with in their operating limits
and installed according to the instructions given in this manual (average values measured in free field at 1
meter from the pump set and elaborated according to ISO standard R1680 –curve A).
The values are referred to groups with Aturia standard electric motors. For other motors the table values
shall be compared to the actual used motors.
MOTOR SIZE
NOISE LEVEL - dB (A)
2 POLES
4 POLES
63
65
61
71
67
62
80
71
64
90
73
66
100
77
68
112
79
69
132
80
69
160
81
69

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6. ROTATION CHECK AND PREPARATION FOR START-UP
WARNING! “DO NOT RUN THE PUMP DRY”
6.1 For Long-coupled pumps only
Prior to starting the pump the bearing housing should be filled with one of the following oils:
Use ISO VG-46 viscosity oil for bearing temperature from 0° to 70°c
Use ISO VG-68 viscosity oil for bearing temperature 70° to 90°C.
OIL QUANTITY: BEARING BRACKET SIZE 24 ca. 0.4 lt.
Fill to the middle of the sight glass, using the following procedure:
i) pour oil into the bearing housing, through the filler cap on top of it, until oil is just visible at the
bottom of the sight glass.
ii) tip back the transparent bulb of the constant level oiler (if mounted), and fill it with oil.
iii) allow the bulb to return to its normal position. Wait for the oil to flow into the bearing housing.
iv) repeat the operation until oil no longer flows out of the bulb.
If there is a toothed spacer coupling between the pump and the motor, check whether it needs to be
filled with oil. Follow the coupling manufacturer's instructions as required.
6.2 DIRECTION OF ROTATION
Rotos PTM series pumps rotation and port location is reversible (see page 11)
To confirm the direction of rotation use the following procedure:
a. Open the suction and discharge valves, allowing the pump to fill with liquid.
b. Remove the coupling guard of a long-coupled pump, or the motor fan cover of a close-
coupled pump.
c. `Bump' the motor by pressing the motor start and stop buttons in quick succession. If the
direction of rotation is incorrect, reverse any two of the three-phase power (see above).
d. After confirming correct rotation, replace the coupling guard or motor fan cover.
!

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7. PRIMING THE PUMP
WARNING! “DO NOT RUN THE PUMP DRY”
7.1 Check that the liquid supply is at the correct temperature, with any necessary heating/cooling in
operation. Open the suction and discharge valves, allowing the pump to fill with liquid.
NOTE: If the direction of rotation has not been checked, this must be done before proceeding (see above).
7.2 Open the discharge valve to 1/4 open.
7.3 Start the motor and immediately check the discharge pressure gauge. The pressure should rise
quickly and hold steady. If the pressure rises and then falls back, there is air or vapour in the system.
STOP THE PUMP IMMEDIATELY
Wait a few seconds before restarting the pump
7.4 If the pressure gauge does not hold steady after repeating step 7.3 several times, shut the pump
down, open the discharge vent (if permissible) and check that all vapour or air is purged from the
system.
7.5 Once the pump is fully primed and a steady discharge pressure is established, slowly open the
discharge valve until the desired operating point is reached. Check that the electric motor current
does not exceed the rated full load current shown on the motor plate.
7.6 If the pump starts to vibrate, rattle or run noisily, the flow rate has become excessive. STOP THE
PUMP IMMEDIATELY. Vibration and noise are an indication of cavitation, which can cause rapid
and severe damage if permitted to continue. If the flow rate needs to be permanently restricted, a
permanent orifice in the discharge line is more secure than an adjustable valve. ROTOS technical
department will advise on a suitable orifice size if necessary.
8. PUMP OPERATION
8.1 Operators should make frequent visual inspections to check that the pump is running smoothly
without noise or vibration, and the discharge pressure is holding steady, without fluctuation, at the
correct figure. Over-heating of the pump or motor bearings is cause for alarm. The bearing housing
should not be more than 50°C above ambient temperature, nor should it exceed 80°C (too hot to
touch) in any event. If the bearings over-heat, shut the pump down immediately, investigate the
cause, and take corrective action.
8.2 Care must be taken to make sure that the sleeve bearings in the pump are replaced in time to prevent
mechanical rubbing between the inner magnet and the rear casing of the pump. This condition can
be detected by an increase in power consumption and loss of pump performance. In addition the
pump may vibrate or operate noisily.
IF LEFT UNATTENDED, THE RUBBING WILL EVENTUALLY BREAK THE REAR
CASING CAUSING LEAKAGE OF THE LIQUID INTO THE ENVIRONMENT.
!
!

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Be sure to maintain properly the ball bearings supporting the outer magnet in the external bearing
housing. Motor bearings in the case of close-coupled pumps. Follow the motor manufacturer's
recommendations and keep the motor bearings maintained.
BEARING FAILURE WILL RESULT IN THE OUTER MAGNET MECHANICALLY
RUBBING ON THE OUTSIDE OF THE REAR CASING, WHICH IF LEFT UNATTENDED
WILL CAUSE THE REAR CASING TO FAIL, WITH LIQUID LEAKAGE INTO THE
ENVIRONMENT.
ATTENTION!:
Never throttle the pump by closing a valve in the suction line.
Th Throttling the suction line can cause serious damage to the pump.
NEVER RESTRICT EITHER THE INLET OR DISCHARGE PIPE IN A TURBINE PUMP
Restriction of the inlet is liable to cause the pump to cavitate leading to loss of efficiency
and rapid wear. Restriction of the discharge, in the turbine pumps, is liable to overload the
electric motor, reduced flow can be obtained, if required, by running a branch from the
discharge back to the liquid source. (BY-PASS).
ATTENTION!:
Do not allow the pump to run against a closed discharge valve for more than a few
seconds. This will cause rapid heating of the liquid in the pump casing, with
vaporization and dry running of the bearings, risking serious damage to the pump.
8.3.1 Rotos pumps are dynamically balanced during manufacture and are tested prior to dispatch to ensure
that they run smoothly and without vibration. Replacement impellers are also balanced prior to
dispatch.
8.4 Vibration monitoring in service can detect poor hydraulic conditions, bearing wear, internal erosion
or chemical attack before it seriously damages the pump. Vibration may be monitored on the internal
pump bearings and/or the external bearing housing and/or the motor bearings. Your supplier will
advise you on vibration monitoring on request.
8.5 If a temperature sensor is fitted to the pump, check regularly to ensure that it is working properly.
8.6 IMPORTANT SAFETY NOTE: When the pump is stopped, unless a non-return valve is fitted in the
discharge line, liquid will drain back through the pump, causing it to rotate in reverse. Do not start the
pump while it is turning backwards, as this can result in immediate and severe damage. Allow ample
time for complete drainage of the discharge line before the pump is restarted.
!
!

 


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9. MAINTENANCE SCHEDULE
Provided the pumped liquid is clean and free of suspended solids, and the pump is operated within
the manufacturer's stated performance limits and is not allowed to run dry, your ROTOS pump is
capable of running for very long periods with minimal attention. Please read paragraph 8.1.
Parts to be inspected
Action to be taken
Frequency
External bearing housing (long-
coupled units)
Fill with appropriate oil to the
middle of the sight glass
Weekly. Change the oil every
5000 hours.
Internal bearing system
Check thrust bearings and
sleeve bearings for wear.
On reassembly use new gaskets
and 0-rings.
After 2500 hours of operation,
check for premature wear.
Check every 5000 hours or
once a year, whichever is
shorter
Motor bearings
Check Instruction
Check Instruction Manual

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10. DECOMMISSIONING THE PUMP
Before the pump is decommissioned, it should be flushed out with clean water or another suitable
liquid.
Thorough flushing out will help to ensure that:
a. if the pump stands idle for an extended period, it is not damaged by precipitation or
encrustation of solids.
b. the pump does not contain dangerous amounts of corrosive, toxic or otherwise hazardous
liquids when dismantled.
If there is any risk of FREEZING in cold weather, the pump and pipework should be drained out.
VERY IMPORTANT
It is the pump user's responsibility to ensure that the pump is in a safe condition
before it is opened or worked on. If the pump is removed and stored, or returned to its
supplier or to a third party for repair or overhaul, it must be clearly LABELLED,
stating what substances or residues it may contain, warning the recipient of any
possible hazard to health. Pumps sent to ROTOS for repair without any indication will
not be accepted and resent to the Customer.
11. DISASSEMBLING THE PUMP
These operations should be carried out only by skilled personnel. Damage caused by careless or
improper disassembly or reassembly is excluded from the supplier's guarantee.
WORK IN A CLEAN AREA!
DO NOT ALLOW MAGNETIC MATERIALS TO CLING TO THE PUMP
MAGNETS.
DO NOT USE FORCE!
The pump should be taken apart with the help of the labeled sectional drawing(s) supplied with it.
If necessary the internal assembly of the pump can be removed from the pump casing without
disturbing the pipework. If a spacer coupling is fitted between pump and motor, the pump can be
dismantled without disturbing the motor.
11.1 Check that the pump has been fully drained and flushed out, before you start work on it.
11.2 Insulate the motor from its electrical supply.
11.3 Insulate the pump from the rest of the hydraulic system. Isolate and disconnect any jacketing or
other auxiliary pipework from the pump.
!
!
!

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11.4 Discharge the oil from the bearing housing. (long coupled units only).
Replace the oil chamber plugs.
11.5 Remove the spacer element of the coupling, or if no spacer is present, remove the motor.
With close-coupled pumps, the motor and external magnet assembly must be removed carefully,
without damaging the magnet. See 11.8 below.
11.6 Dismantling the magnetic drive
SAFETY NOTE WHEN WORKING WITH MAGNETS: See PRECAUTIONS on page 16.
Take care not to trap your fingers as the two halves of the magnetic coupling are separated
Remove the bolts securing the bearing housing to the bracket and carefully withdraw the external
bearing housing with the external magnet attached.
Withdraw the external bearing housing and external magnet slowly and progressively, taking care to
avoid damaging the brittle magnetic elements inside the external magnet.
11.8 Removing the external magnet from the motor shaft or the external bearing shaft
First loosen the grub screws securing the external magnet. Then use a puller to extract the magnet
slowly and progressively from the shaft. If a suitable puller is not available, use wooden levers.
MAGNET PULLER: