Horizontal position
Proceed as follows:
1. Place the pump with the inspection screw A is
pointing upwards.
A
B
C
TM031628
Pump with inspection screw A upwards
CAUTION
Pressurised system
Minor or moderate personal injury
‐
The oil chamber may be under
pressure. Loosen the crews care-
fully and do not remove them until
the pressure has been completely
relieved.
2. Loosen and remove screw A.
3. Remove screw B and check the oil level.
4. Take an oil sample to inspect the condition of the
oil. If the oil is greyish white, it contains water. In
normal operation, a small leakage through the
mechanical shaft seals is expected. If the water
content in the oil is high, the shaft seal may be
defective. Change the oil if it contains water. Oil
not containing water can be reused.
5. If the oil needs to be changed, place a clean
container under the pump to collect all the
drained-off oil.
6. Remove screw C and allow all the oil to drain from
the chamber into the container. Emulsified oil
must be changed and disposed of.
Used oil must be disposed of in ac-
cordance with local regulations.
7. Replace the O-rings, refit screw C and tighten
securely. Fill the oil chamber with oil to the correct
level. Refit screws A and B and tighten securely.
Vertical position
Proceed as follows:
1. Identify the screws A, B and C and their positions
relative to each other. See fig. Pump with
inspection screw A upwards.
A
B
TM046924
Correct oil level of vertical pump
2. Use screw B for indication of the oil level in the oil
chamber. See fig. Correct oil level of vertical
pump.
3. When the pump is vertical, the oil has to be
pumped out of the oil chamber. Use a suction
pump with a flexible suction hose that can be
inserted deep into the oil chamber.
4. Pump out the oil using all the screw holes in turns
to reach all sections of the interior of the oil
chamber. Collect the drained oil in a clean
container.
5. Replace the O-rings, refit screw C and tighten
securely. Fill the oil chamber with oil to the correct
level. Refit screws A and B and tighten securely.
8.4 Inspection and adjustment of the
impeller clearance
The correct axial clearance is 0.7 mm ± 0.2 mm for S
72 and 1.3 mm ± 0.2 mm for S 74-78. Reset the
clearance if it is 2.0 mm or more. The method for
resetting the clearance is different for submersible
pumps, installation types S, C and ST, and for dry-
installed pumps, installation types D and H.
8.4.1 Submersible pumps, installation types S, C
and ST
Submersible pumps have a separate, adjustable
pump inlet cover which may be shaped as an inlet
bell. Locate the six fastening screws of the inlet cover
and the three set screws.
Use a feeler gauge to check the clearance between
the impeller and the inlet cover all around the
perimeter of the inlet opening. See fig. Impeller
clearance, installation types S, C and ST.
34
English (GB)
Summary of Contents for ST-55-520
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