Grundfos MTB Series Betriebsanleitung

Service instructions

MTB

50 Hz

1 / 13

96649460 1006 GB 13

1. Type identification........................................................................................................................... 2

1.1 Nameplate ...........................................................................................................................................................2

1.2 Type key..............................................................................................................................................................2

1.3 Key to codes........................................................................................................................................................3

2. Tightening torques and lubricants................................................................................................. 4

3. Service tools .................................................................................................................................... 5

3.1 Special tools ........................................................................................................................................................5

3.2 Standard tools......................................................................................................................................................5

3.3 Torque tools.........................................................................................................................................................5

4. Dismantling and assembly ............................................................................................................. 6

4.1 General information.............................................................................................................................................6

4.2 Removing the pump head and motor ..................................................................................................................6

4.3 Removing the impeller.........................................................................................................................................6

4.4 Removing the shaft seal and pump head............................................................................................................6

4.5 Removing the pump shaft....................................................................................................................................6

4.6 Fitting the pump shaft..........................................................................................................................................6

4.7 Fitting the pump head and shaft seal...................................................................................................................6

4.8 Fitting the impeller ...............................................................................................................................................7

4.9 Fitting the pump head and motor.........................................................................................................................7

5. Maintenance..................................................................................................................................... 8

5.1 Pump ...................................................................................................................................................................8

5.2 Motor....................................................................................................................................................................8

5.3 Service by Grundfos............................................................................................................................................8

6. Start-up............................................................................................................................................. 9

6.1 Priming.................................................................................................................................................................9

6.2 Checking the direction of rotation........................................................................................................................9

6.3 Start-up................................................................................................................................................................9

6.4 Restarting ............................................................................................................................................................9

6.5 Stopping...............................................................................................................................................................9

7. Fault finding................................................................................................................................... 10

8. Drawings......................................................................................................................................... 12

8.1 MTB 50-200/215, 65-160/158 and 65-160/171 (pump with feet).......................................................................12

8.2 MTB 65-200/183 and 65-200/199 (motor with feet)...........................................................................................13

2 / 13

1. Type identification

This section shows the type key, nameplate and the codes that can appear in the variant code.

1.1 Nameplate

The pump nameplate is fitted on the upper side of the pump head.

Fig. 1 Nameplate

1.2 Type key

* See 1.3 Key to codes.

The example describes an MTB 50-200 pump with an impeller diameter of 119 mm. It is a basic version, with DIN flanges, made

of cast iron and with a BQQV shaft seal.

TM03 2218 3905

Pos. Description Pos. Description

1 Type designation 5 Country of origin

2 Product number, serial number 6 Speed

3 Rated flow rate 7 Head

4 Max. system pressure/max. liquid temperature 8

MTB 50 -200 /119 A -F -A -BQQV

Type range

Nominal diameter of discharge port (DN)

Size of pump housing

Impeller diameter [mm]

Code for pump version *

Code for pipe connection *

Code for materials, excluding plastic and rubber parts *

Code for shaft seal and plastic and rubber parts *

bar/°CMAX

m /h

p/t

mnmin-1

Model

96145329

Type

MTB 50 - 200/119 A - F - A - BQQV

A 96580752 P2 ..................

90 45 2900

16/90

MADE IN HUNGARY

3 / 13

1.3 Key to codes

Code for pump version

Code for pipe connection

Code for materials, excluding plastic and rubber parts

Code for materials, including plastic and rubber parts

As standard, the pump has O-rings of FKM rubber.

Code Description

ABasicversion

Code Description

F DIN flange

Code Description

A Cast iron

Code Description

B Rubber bellows seal

Q Silicon carbide

VFKM

PNBR

4 / 13

2. Tightening torques and lubricants

Pos. Description Quantity Dimensions Torque [Nm] Lubricant

2 Pump head 1 Soapy water

6 Set screw 2 M8 15 Loctite 243

17 Air vent screw 1 8

20 Priming and drain plug 2 25

26 Staybolt 6 or 8 M10 45

36 Nut 6 or 8 M10 45

36a Nut 4 M8

M12

M16

100

67 Nut 1 M18 80

72a O-ring 1 Soapy water

105 Shaft seal 1 Soapy water

5 / 13

3. Service tools

The following drawings and tables show special, standard and torque tools for pump service.

3.1 Special tools

3.2 Standard tools

3.3 Torque tools

ABCD

EFGH

Pos. Designation For pos. Description Part number

A Pinch bar 2, 6

Pos. Designation For pos. Description Part number

B Ring/open-end spanner 17, 20, 36, 36a, 67

C Bit holder C

DBitskit 7a,9

Pos. Designation For pos. Description Part number

E Torque wrench E

F Ratchet insert tool F, G

G Hexagon head driver 9

H Hexagon socket 20, 36, 36a, 67

6 / 13

4. Dismantling and assembly

4.1 General information

Follow these instructions if it is necessary to dismantle the pump, either because it is clogged or damaged. Position numbers of

parts (digits) refer to 8. Drawings; position numbers of tools (letters) refer to 3. Service tools.

Before dismantling

• Disconnect the electricity supply to the motor.

• Close the isolating valves, if fitted, to avoid draining the system.

• Remove the electric cable in accordance with local regulations.

Before assembly

• Clean and check all parts.

• Replace defective parts with new parts.

• Order the necessary spare parts.

• Gaskets and O-rings should always be replaced when the pump is overhauled.

During assembly

• Lubricate and tighten screws and nuts with the correct torque. See 2. Tightening torques and lubricants.

4.2 Removing the pump head and motor

1. Place a container underneath the pump.

2. Slacken the air vent screw (pos. 17) and remove the drain plug (pos. 20) in the bottom flange.

3. Empty the pump of liquid, if any.

4. Lift the motor with pump head (pos. 2) by a pulley or similar device.

5. Remove the nuts (pos. 36) fixing the pump head (pos. 2) with the motor to the pump housing (pos. 6).

6. Loosen the pump head from the pump housing with a pinch bar (pos. A).

7. Carefully pull the pump head and motor until the impeller (pos. 49) is free of the pump housing (pos. 6).

8. Remove the O-ring (pos. 72a).

4.3 Removing the impeller

1. Remove the pump head and motor. See 4.2 Removing the pump head and motor.

2. Remove the nut (pos. 67) holding the impeller (pos. 49).

3. Remove the spring washer (pos. 66a) and washer (pos. 66).

4. Remove the impeller (pos. 49) and distance piece (pos. 103).

4.4 Removing the shaft seal and pump head

1. Remove the impeller. See 4.3 Removing the impeller.

2. Remove the rotating shaft seal part (pos. 105).

3. Remove the nuts (pos. 36a) and bolts (pos. 28a) holding the pump head (pos. 2) and the motor together.

4. Pull the pump head (pos. 2) free of the pump shaft (pos. 51).

5. Press the stationary shaft seal part out of the pump head from the motor end.

6. Remove the O-ring of the shaft seal from the pump head.

4.5 Removing the pump shaft

1. Slacken the two set screws (pos. 9) fixing the pump shaft (pos. 51) to the motor shaft.

2. Pull the pump shaft (pos. 51) off the motor shaft.

4.6 Fitting the pump shaft

1. Fit the key into the keyway of the motor shaft (pos. 51).

2. Fit the pump shaft (pos. 51) to the motor shaft, making sure to press the pump shaft home on the motor shaft.

3. Tighten the two set screws (pos. 9) to a torque of 15 Nm so that the pump shaft is fixed on the motor shaft.

4.7 Fitting the pump head and shaft seal

1. Fit the pump head (pos. 2) over the pump shaft (pos. 51). Take care not to damage the pump shaft.

2. Bolt together the motor and pump head using the bolts (pos. 28) and nuts (pos. 36a).

(Tightening torque: M8: 12 Nm, M12: 40 Nm or M16: 100 Nm).

3. Lubricate the shaft seal (pos. 105) with soapy water and fit it carefully on the pump shaft.

7 / 13

4.8 Fitting the impeller

1. Fit the impeller (pos. 49) on the pump shaft.

2. Fit the washer (pos. 66), spring washer (pos. 66a) and nut (pos. 67) on the pump shaft. Tighten the nut to a torque of 80 Nm.

4.9 Fitting the pump head and motor

1. Lubricate the O-ring (pos. 72a) with soapy water and fit it on the pump head.

2. Lift the motor with pump head by the pulley and carefully insert the impeller (pos. 49) into the pump housing (pos. 6).

3. Fit the nuts (pos. 36) on the bolts (pos. 26) and tighten them diagonally to a torque of 45 Nm.

After assembly

• Fit the drain plug (pos. 20) and tighten the air vent screw (pos. 17).

• Connect the electric cable in accordance with local regulations.

• Vent, prime and prepare the pump for start. See 6. Start-up.

8 / 13

5. Maintenance

5.1 Pump

If the pump is to be drained for a long period of inactivity, inject a few drops of silicone oil on the shaft between the pump head

and the coupling. This will prevent the shaft seal faces from sticking together.

5.2 Motor

Check the motor at regular intervals. It is important to keep the motor clean in order to ensure adequate ventilation. If the pump

is installed in dusty environments, the motor must be cleaned and checked regularly.

Lubrication:

Motors with power ratings lower than 11 kW have greased-for-life bearings.

The bearings of motors of 11 kW and up must be greased according to the indications on the motor nameplate.

The motor should be lubricated with a lithium-based grease meeting the following specifications:

• NLGI class 2 or 3.

• Viscosity of basic oil: 70 to 150 cSt at +40°C (~ +104°F).

• Temperature range: –30°C (~ –22°F) to +140°C (~ +284°F) during continuous operation.

5.3 Service by Grundfos

If Grundfos is requested to service such a pump, Grundfos must be contacted with details about the pumped liquid, etc. before

the pump is returned for service. Otherwise Grundfos can refuse to accept the pump for service.

Possible costs of returning the pump are paid by the customer.

If a pump has been used for a liquid which is injurious to health or toxic, the pump will be classified as contaminated.

9 / 13

6. Start-up

Note: Do not start the pump until it has been filled with liquid and vented.

6.1 Priming

The suction pipe and the pump must be filled with liquid and vented before the pump is started.

If the liquid level is below the pump inlet or there are airlocks in the suction pipe, proceed as follows:

1. Close the discharge isolating valve and open the isolating valve in the suction pipe.

2. Loosen the air vent screw (pos. 17).

3. Remove the plug (pos. 20) from one of the pump flanges, depending on the pump location.

4. Pour liquid through the priming hole.

5. Make sure the suction pipe and the pump are completely filled with liquid.

6. Fit the plug and tighten securely.

7. Tighten the air vent screw (pos. 17).

The suction pipe can to some extent be filled with liquid and vented before it is connected to the pump. A priming device can

also be installed before the pump.

6.2 Checking the direction of rotation

Note: The pump must be filled with liquid when checking the direction of rotation.

The correct direction of rotation is indicated by the arrow on the pump housing. When seen from the motor fan, the pump should

rotate clockwise. Start the motor only for a short moment.

6.3 Start-up

1. Completely open the suction isolating valve and leave the discharge isolating valve almost closed.

2. Start the pump.

Note: Sudden, large pressure changes in the discharge pipe may damage the pump.

3. Vent the pump during starting by loosening the air vent screw (pos. 17) in the pump head until a steady stream of liquid runs

out of the vent hole.

4. When the piping system has been filled with liquid, slowly open the discharge isolating valve until it is completely open.

5. In case of overload, throttle the valve on the discharge side until the motor is not overloaded.

6. If the pump does not build up pressure at once, stop it and repeat the starting procedure.

6.4 Restarting

Do not restart the pump until the pump shaft stands still.

6.5 Stopping

Backflow is stopped by means of the non-return valve or counter pressure in the pipeline.

Switch off the motor and check that it slows down smoothly.

Fit the coupling guard before starting the pump.

In hot-water installations, special attention should be paid to the risk of personal injury caused by scalding hot water.

The motor should not be removed when checking the direction of rotation, as this may damage the shaft seal.

Pay attention to the orientation of the vent hole to ensure that the escaping water does not cause personal injury or

damage to the motor or other components.

In hot-water installations, special attention should be paid to the risk of personal injury caused by scalding hot water.

The pump must never be operated for long periods if the isolating valve on the discharge side is closed.

Backflow of the pumped liquid must not result in a change in the direction of rotation of the pump.

10 / 13

7. Fault finding

Before removing the terminal box cover and before any dismantling of the pump, make sure that the electricity supply

has been switched off. It must be ensured that it cannot be accidentally switched on.

Fault Cause Remedy

1. Motor does not run when

started. a) Electrical supply failure. Switch on the electricity supply.

b) Fuses are blown. Replace the fuses.

c) Motor-protective circuit breaker has

tripped out. Reactivate the motor-protective circuit

breaker.

d) Contacts of the motor-protective circuit

breaker or magnet coil defective. Replace the contacts or magnetic coil.

e) Impeller blocked. Motor cannot rotate. Clean the inside of the pump and inspect for

damage.

f) Control-current circuit defective. Repair the control-current circuit.

g) Motor defective. Replace the motor.

2. The motor-protective cir-

cuit breaker trips out im-

mediately when

reactivated.

a) Fuse is blown. Replace the fuse.

b) Contacts of motor-protective circuit

breaker defective. Replace the contacts.

c) Cable connection is loose or faulty. Fasten or replace the cable.

d) Motor winding is defective. Replace the motor.

e) The pump is mechanically blocked. Clear obstruction.

f) The overload setting of motor-protective

circuit breaker is too low. Set the motor-protective circuit breaker cor-

rectly.

3. The motor-protective cir-

cuit breaker trips out oc-

casionally.

a) The overload setting of motor-protective

circuit breaker is too low. Set the motor-protective circuit breaker cor-

rectly.

b) Supply voltage periodically too low or too

high. Check the voltage supply.

c) Differential pressure across pump too low. Vent the pump. See section 6. Start-up.

4. Motor-protective circuit

breaker has not tripped

out but the pump does

not run.

a) Check 1 a), b), d) and e).

5. The pump capacity is un-

stable. a) Pump inlet pressure too low. Increase the inlet pressure.

b) Suction pipe/pump partly clogged by impu-

rities. Clean the suction pipe/pump.

c) The pump draws in air.

- Leakage in pipe.

- Water level in tank too low. - Repair the leakage.

- Increase the water level in the tank.

Vent the system.

6. Pump runs but gives no

liquid. a) Suction pipe/pump clogged by impurities. Clean the suction pipe/pump.

b) The foot or non-return valve is stuck in its

closed position. Clean/repair the foot or non-return valve.

c) Leakage in suction pipe. Repair the leakage.

d) Air in suction pipe or pump. Vent the pump.

e) Motor rotates in the wrong direction. Change the direction of rotation.

7. The pump runs back-

wards when switched off. a) Leakage in suction pipe. Repair the leakage.

b) Foot or non-return valve defective. Replace the defective foot or non-return valve.

c) The foot or non-return valve is stuck in its

closed position. Clean/repair the foot or non-return valve.

8. Leakage in shaft seal. a) Adjustment of pump shaft in coupling is in-

correct. Adjust the shaft and check the shaft seal.

b) Shaft seal is defective. Replace the shaft seal.

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