Table of Contents
Advertisement
7. Operation and maintenance
Note: The pump is not allowed to run against a
closed discharge valve for more than approx. 5 min-
utes as this will cause an increase in temperature/
formation of steam in the pump which may cause
damage to the pump.
7.1 Lubrication and maintenance
Pumps installed in accordance with these instruc-
tions require very little maintenance.
When a mechanical shaft seal is fitted, it is self-
adjusting and has wear-resistant seal rings which
are lubricated and cooled by the pumped liquid.
The pump bearings are also lubricated by the
pumped liquid. The motor ball bearings are grease
packed and sealed for life. No further lubrication is
necessary.
Pumps from 4 kW (5.0 hp) and up have angular con-
tact bearings.
7.2 Filters
Chip trays, filters, etc. should be cleaned at regular
intervals to ensure a correct flow of liquid.
7.3 Periodic checks
At regular intervals, depending on the conditions and
time of operation, the following checks should be
made:
• Check the quantity of liquid and operating pres-
sure.
• Check that there are no leaks.
• Check that the motor is not overheating.
• Check the tripping of the motor starter.
• Check that all controls are operating satisfactorily.
If the above checks do not reveal any abnormal
operating details, no further checks are necessary.
Should any faults be found, check the symptoms with
section 10. Fault finding chart.
8. Service
If a pump has been used for pumping
liquids which are injurious to human health
or poisonous, it will be classified as con-
taminated.
Do not turn the pump upside down during
service. Residual liquids from the cham-
bers may damage the motor.
A contaminated pump must not be sent to Grundfos
for service until Grundfos has received all necessary
details about the pumped liquid, etc. Otherwise
Grundfos can refuse to accept the pump for servic-
ing.
Possible costs of returning the pump are to be paid
by the customer.
6
9. Sound pressure level
Motor
[kW]
[hp]
0.25
0.34
0.37
0.50
0.55
0.75
0.75
1.0
1.1
2.0
1.5
2.0
2.2
3.0
3.0
5.0
4.0
5.0
5.5
7.5
7.5
10
L
[dB(A)]
pA
50 Hz
60 Hz
<70
<70
<70
<70
<70
<70
<70
<70
<70
<70
<70
71
<70
71
<70
71
73
71
73
78
73
78
Advertisement
Table of Contents
