Maintenance Schedule; Checking And Changing The Oil - Grundfos SE1 50 Installation And Operating Instructions Manual

Maintenance work on explosion-proof
pumps must be carried out by Grundfos or
a service workshop authorised by
Grundfos.
However, this does not apply to the
hydraulic components, such as pump
housing and impeller.
Observe all regulations applying to pumps
installed in potentially explosive
environments.
Make sure that no work is carried out in
potentially explosive environment.
Before carrying out maintenance and service, flush
the pump thoroughly with clean water. Rinse the
pump parts in water after dismantling.

8.1 Maintenance schedule

Explosion-proof pumps must be checked
by an authorised Ex workshop after 3000
working hours or at least once a year.
When the pump is new or after
replacement of the shaft seal, check the oil
level and water content after one week of
operation.
If the pump has not been in operation for
some time, vent it to let any explosive
gasses gathered in the pump escape.
Pumps running normal operation must be inspected
every 3000 operating hours or at least once a year. If
the pumped liquid is very muddy or sandy, inspect
the pump at shorter intervals.
Pumps with sensor offer the possibility of constant
monitoring of key components in the pump, such as
shaft seal condition, bearing temperature, winding
temperature, insulation resistance and moisture in
the motor.
Check the following points:
• Power consumption
See pump nameplate.
• Oil level and oil condition
See section 8.2 Checking and changing the
• Cable entry
Make sure that the cable entry is watertight
(visual inspection) and that the cable is not
sharply bent and/or pinched.
The cable must be replaced by Grundfos
or a service workshop authorised by
Grundfos.
• Pump parts
Check the impeller, the pump housing, etc. for
possible wear. Replace defective parts. See
section 8.3 Cleaning and inspecting the
• Ball bearings
Check the shaft for noisy or heavy operation (turn
the shaft by hand). Replace defective bearings. A
general overhaul of the pump is usually required
in case of defective ball bearings or poor motor
function. This work must be carried out by
Grundfos or a service workshop authorised by
Grundfos.
Defective bearings may reduce the Ex
safety.
• O-rings and similar parts
During service or replacement, make sure that
the grooves for the O-rings as well as the seal
faces have been cleaned before the new parts
are fitted.
Do not reuse used rubber parts.
• Sensors
See section

8.2 Checking and changing the oil

Inspect the oil level and condition every
3000 operating hours or at least once a
year.
When the pump is new or after
replacement of the shaft seal, check the oil
level and water content after one week of
operation.
• Change the oil after 3000 operating hours or
once a year.
• Change the oil if the shaft seal has been
replaced.
Check and change the oil in the oil chamber as
described below.
Use Shell Ondina X420 oil or similar type.
oil.
2-pole
pump.
8.4 Repairing the product.
Power [kW] Oil quantity [l]
2.2
3.0
4.0
6.0
7.5
9.2
11.0
0.30
0.55
0.70
25