4. Tighten the fastening screws, required torque is 50 ± 5 Nm. Impeller clearance (1) is set.
Pos. Description
TM1040239
Clearance gaps
1
Tip gap between
impeller and suction
cover, must be 0.5 ±
0.1 mm.
2
Indirect gap for control
measurement
5. Start the pump and listen if there is any noise from the impeller touching the suction cover.
a. If there is no noise, no further action is necessary.
b. If there is noise, stop the pump immediately, loosen all fastening screws, then loosen the set screws by rotating them 10° further, then
finally tighten the Fixing Screws according to Step 4. If this does not solve the noise issue, start over from Step 1.
13.1.2 Impeller clearance adjustment - in case of major maintenance when the pump is removed from application
Tighten the set screws carefully to avoid bearing damage.
The following method is suitable for pumps in horizontal position.
TM083497
Horizontal lifting points for SL pumps
SL pumps are not intended for horizontal installation.
Only move them horizontally for maintenance purposes.
Proceed as follows:
1. Loosen all fastening screws.
2. Slowly tighten all three set screws to a stop. Follow a circular pattern when tightening, use the same torque on each screw (torque wrench
not necessary). In this case, the suction cover touches the impeller, and the impeller cannot be turned, the gap is set to 0. To make sure
that the Suction Cover is not slanted in any direction, check the „Indirect Gap” around. The gap must be even all around.
3. Loosen all set screws one by one, by turning them 120° counterclockwise.
4. Tighten all fastening screws to stop. Follow a circular pattern when tightening, use the same torque on each screw (torque wrench not
necessary).
5. Now the impeller clearance (gap between suction cover and impeller) should be 0.5 ± 0.1 mm. Check the gap in 60° steps around by
rotating the impeller and using a gap gauge.
91
English (GB)
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