Maintaining The Explosion-Proof Se, Sl Pumps; Spare Parts; Contaminated Pumps - Grundfos SE Serie Instrucciones De Instalación Y Operación

10.2.1 Adjusting the impeller clearance
Tighten the fastening screws gently to avoid damage to
the bearings. The movement is usually 0.04 to 0.12 in (1
to 3 mm).
2 1
Impeller adjusting screws
1 Set screw
2 Fastening screw
3 Impeller clearance
The following method is suitable for pumps in vertical position.
Proceed as follows:
1. Loosen the fastening- and set screws so the impeller is sitting
on the suction cover / stationary wear ring. When the impeller is
in this position, the impeller clearance is zero.
2. Tighten the three set screws down by hand until they touch the
top surface of the volute.
3. The impeller clearance is created by turning the set screws to a
specified angle. Closed S-tube
well as the different head classes, have different impeller
clearances. See the table above to determine the correct
impeller clearance and turning angle.
4. Once the correct angle is identified, turn the set screw clockwise
by the specified angle. Use a turning gauge to ensure the set
screw is tightened to the correct amount.
5. Tighten the fastening screws in two steps, according to the
sequence below:
• Tighten the screws one by one, from 1 to 6. Required torque:
40 ± 4 Nm.
2
1
2
2
® ®
and open S-tube impellers, as
• Repeat the previous sequence to the final torque of 70 ± 4
Nm
6
3
5
2
Tightening sequence

10.3 Maintaining the explosion-proof SE, SL pumps

Overhauled and repaired explosion-proof pumps are marked with a
repair plate providing the following information:
• repair symbol R
• name or registered trade mark of the repairing workshop
• workshop reference number relating to the repair
• date of overhaul or repair.
In the event of subsequent repairs, the existing repair plate must be
replaced by a new updated one and earlier markings must be
recorded.
The repairing workshop must keep records of performed overhauls
and repairs with records of all previous overhauls, repairs and
possible modifications. Copies of the detailed records of the
repairing workshop must be filled by the owner or operator with the
original type certificate of the explosion-proof motor.
10.3.1 Power cable
Use only manufacturer-approved and compatible cables that are
suitable for the cable entry.
10.3.2 Cable entry
Use only FM-approved cable entry parts corresponding to the cable
diameter. The correct cable dimension marking is stamped on the
cable entry.

10.3.3 Spare parts

Damaged motor parts must always be replaced by new and
approved parts. Motor parts must not be reconditioned.

10.4 Contaminated pumps

The product is classified as contaminated if it is used for a
contagious or toxic liquid.
CAUTION
Biological hazard
Minor or moderate personal injury
‐
Flush the pump thoroughly with clean water and rinse
the pump parts after dismantling.
Contact Grundfos with details about the pumped liquid before
returning the product for service. Otherwise, Grundfos can refuse to
accept the product for service.
Clean the product in the best possible way before returning it.
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