Inspection And Adjustment Of Impeller Clearance - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

Upright position
Proceed as follows:
1. Identify the screws A, B and C and their positions relative to
each other. See fig. 33.
B
Fig. 34 Correct oil level of upright pump
2. Use screw B for indication of the level of oil in the oil chamber.
See fig. 34.
3. When the pump is upright, 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 so as 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.

9.4 Inspection and adjustment of impeller clearance

The correct axial clearance is 0.05 in ± 0.0079 in(1.3 mm ± 0.2
mm). Reset the clearance if it is 0.08 in (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. For dry-installed pumps there
are two methods.
All methods are described here.
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9.4.1 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. When the pump is installed
or pulled out of the pit for service, 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. 35.
DANGER
Overhead load
Death or serious personal injury
- Never work under a pump when it is hanging from
crane.
Before adjusting the clearance, clean the gap
between impeller and inlet cover.
1. Loosen all fastening screws and set screws between inlet
cover and pump housing.
2. Use a mallet to tap at the inlet cover and close the clearance.
3. Open the clearance to the specified value by turning the three
set screws.
4. Check that the clearance is uniform around the perimeter of
the inlet opening.
5. Tighten the fastening screws and check that the clearance is
still uniform.
6. Turn the impeller by hand and check at several points.
Fig. 35 Impeller clearance, installation types S, C and ST