Grundfos MQ 3-45 Service Instructions

28.04.2003
GB
6 / 24
3.2 Replacing the shaft seal, chambers and impellers
3.2.1 Removing the shaft seal
1. Slacken and remove the strap pos. 92.
2. Remove the screws pos. 91.
3. Carefully remove the pump sleeve pos. 16 using a screwdriver.
4. Remove the inlet part pos. 6 from the pump sleeve or the top of the chamber stack.
5. Remove the nut pos. 67 and the washer pos. 66. Hold the shaft with a screwdriver in the shaft end.
6. Remove the chambers pos. 4 and the impellers pos. 49.
7. Remove the washer pos. 107, the retaining ring pos. 111 and the washer pos. 102.
8. Remove the rotating shaft seal part pos. 104.
9. Remove the stationary shaft seal part pos. 103 using a screwdriver.
3.2.2 Fitting the shaft seal
1. Fit the stationary shaft seal part pos. 103 with the groove against the intermediate part pos. 2.
2. Fit the rotating shaft seal part pos. 104.
3. Fit the washer pos. 102 (2 mm), the retaining ring pos. 111 and the washer pos. 107.
TM02 0086 3700
TM02 6626 1103
104
102
111
107

Grundfos MQ 3-45 Specifications

General

Power consumption	1000 W
Maximum head	45 m
Maximum flow rate	3 m³/h
Protection class	IP54
Weight	13 kg
Maximum liquid temperature	35 °C
Maximum operating pressure	7.5 bar
Pumped liquid	Clean water
Liquid temperature range	0 - 35 °C
Maximum ambient temperature	45 °C
Supply voltage	220-240 V
Rated power - P2	0.75 kW
Mains frequency	50/60 Hz
Rated current	4.5 A
Enclosure class	IP54
Inlet connection	1 inch
Outlet connection	1 inch
Power supply	220-240 V, 50/60 Hz
Pump type	Centrifugal
Built-in pressure tank	Yes
Approvals	CE
Material	Stainless steel