Inspection And Adjustment Of Impeller Clearance - Grundfos S Serie Manual Del Usuario

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.
B
Correct oil level of a vertical pump
2. Use screw B for indication of the oil level in the oil chamber. See
fig. Correct oil level of a 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. 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.

10.4 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.
26
10.4.1 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. Impeller clearance, installation types S, C and ST.
DANGER
Crushing hazard
Death or serious personal injury
‐
Never work under a pump when it is hanging from a
crane.
Before adjusting the clearance, clean the gap between the
impeller and the inlet cover.
1. Loosen all fastening- and set screws between the inlet cover
A
and the 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.
Impeller clearance, installation types S, C and ST