Checking The Direction Of Rotation; Maintenance And Service; Oil Check And Oil Change; Inspection And Adjustment Of Impeller Clearance - Grundfos S1 Serie Instrucciones De Instalación Y Funcionamiento

Note: In case of abnormal noise or vibrations from the pump or
other pump or supply failures, stop the pump immediately. Do not
attempt to restart the pump before the cause of the fault has been
found and the fault corrected.
10.After start-up, the actual pump duty point must be established
as accurately as possible so that it can be checked whether
the operating conditions are as desired.
Note: The pump may be started for a very short period without
being submerged for checking of direction of rotation.
The operation of the pump should always take place in accord-
ance with established routines with scheduled checks of pump
monitoring equipment and accessories (valves, etc.). Make sure
that the pump and equipment settings cannot be changed by
unauthorized persons.

6.1 Checking the direction of rotation

An arrow cast in the pump housing indicates the correct direction
of rotation. The pump must rotate clockwise when seen from the
drive end. Observe the movement of the pump (jerk) when
started. If the pump moves counter-clockwise, the direction of
rotation is correct.
As an alternative, the direction of rotation can be checked as
follows:
1. Start the pump and check the quantity of liquid or the dis-
charge pressure.
2. Stop the pump and interchange two of the phases to the
motor.
3. Restart the pump and check the quantity of liquid or the dis-
charge pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3. The connec-
tion which gives the larger quantity of liquid or the higher
pressure is the correct direction of rotation.
Note: The pump must only run for a short period when sus-
pended from a chain.

7. Maintenance and service

During maintenance and service, including
transportation to service workshop, always support
the pump by means of lifting chains or place it in
horizontal position to secure stability.
Before starting work on the pump, make sure that the
fuses have been removed or the mains switch has
been switched off. It must be ensured that the elec-
tricity supply cannot be accidentally switched on.
All rotating parts must have stopped moving.
Maintenance and service must be carried out by specially trained
persons.
The maintenance and service work on explosion-
proof pumps must be carried out by Grundfos or a
service workshop authorized by Grundfos.
Before carrying out maintenance and service, it must be ensured
that the pump has been thoroughly flushed with clean water.
Rinse the pump parts in water after dismantling.
Pumps running normal operation should be inspected every
2000 operating hours or at least once a year. If the pumped liquid
is very muddy or sandy, the pump should be inspected every
1000 operating hours or every six months.
12
The following points should be checked:
• Power consumption
• Oil level and oil condition
When the pump is new or after replacement of the shaft seals,
check the oil level after one week of operation. The oil becomes
greyish white like milk if it contains water. This may be the
result of a defective shaft seal. The oil should be changed if it
contains water. See section 7.1 Oil check and oil change.
Note: Used oil must be disposed of in accordance with local
regulations.
The oil chamber contains 0.35 to 0.9 litres of SAE 10 W 30
motor oil depending on pump size.
• Cable entry
Make sure that the cable entry is watertight and that the
cables are not sharply bent or pinched.
• Impeller clearance
Check the impeller clearance. See section 7.2 Inspection and
adjustment of impeller clearance.
• Pump parts
Check the pump housing, etc. for possible wear. Replace
defective parts.
• Ball bearings
Check the shaft for noisy or heavy operation (turn the shaft by
hand). Replace defective ball 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 an authorized service workshop.
The ball bearings must be replaced at least every
25,000 operating hours.
Note: Out of consideration for the heat-conducting ability, the
pump should be cleaned on the outside at regular intervals.

7.1 Oil check and oil change

Proceed as follows:
1. Place the pump in such a position that one of the inspection
screws is pointing upwards.
When slackening the inspection screw of the oil
chamber, note that pressure may have built up in the
chamber. Do not remove the screw until the pressure
has been fully relieved.
2. Place a clean container under the pump to collect all the
drained-off oil. Slacken the screw pointing to the side and
observe the oil level. The drained-off quantity of oil indicates
whether the lower mechanical shaft seal is leaking, which may
be normal.
3. Turn the pump and allow all the oil to drain from the chamber
into the container. Pour an oil sample into a glass container
and observe the condition of the oil.
Clear oil can be reused.
Emulsified oil must be changed and disposed of.
Note: Used oil must be disposed of in accordance with local
regulations.
Low oil level may indicate that the upper mechanical shaft seal
is defective. Contact an authorized service workshop for fur-
ther overhaul of the pump and repair, if required.
4. Fill the oil chamber with oil to the correct level. Replace the
O-rings by new rings, insert the screws and tighten securely.
Use viscosity grade SAE 10 W 30 or ONDINA 917.

7.2 Inspection and adjustment of impeller clearance

Adjustment of the impeller clearance is only relevant for
pumps with single-channel impellers (S1 pumps).
The correct impeller clearance is 0.7 mm ±0.2 mm. The clearance
should be adjusted if it is worn to 1.2 mm or more.
The procedures for adjustment of the impeller clearance are dif-
ferent for pumps in submerged installation (type S and C) and
pumps in dry installation (type D). Both procedures are described
in the following.