Pump Overhaul; Contaminated Pumps; Shaft Seal Inspection - Grundfos SE Service Instructions Manual

Leakage chamber on SL pumps
A
B
1. Place a plastic container under the leakage chamber plug.
2. Remove the leakage chamber plug (B).
3. Drain the fluid from the leakage chamber. Tilt the pump if necessary.

10.2 Pump overhaul

Pumps running in normal operation require major overhaul after 24.000 operating hours or 6 years, whichever comes first. The overhaul
includes the replacement of the following:
• shaft seal
• bearings
• impeller + suction cover
• moisture switch
• gaskets
• O-rings
• motor liquid.

10.3 Contaminated pumps

The product is classified as contaminated, if it is used for 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.
Before returning the product for service, contact Grundfos with details about the pumped liquid. Otherwise, Grundfos can deny to service the
product.
Any application for service must include details about the pumped liquid.
Clean the product in the best possible way before returning it.

10.4 Shaft seal inspection

10.4.1 How to avoid shaft seal damage
1. Improper assembly of the pump can lead to shaft seal failures.
a. The O-ring in the shaft seal must be lubricated, with the lubricant placed on a cleaned shaft. Clean the shaft with soap prior to applying
the silicon spray lubricant.
b. Once the shaft seal is on the shaft, the shaft seal must not be tilted.
i. The shaft seal protection tool is required to prevent damage caused by accidentally hitting the shaft seal with the seal housing as it is
lowered into place. Hitting the shaft seal with the seal housing may tilt and break the shaft seal.
ii. Tighten the lower seal housing screws in a diagonal sequence, to avoid tilting the seal housing. A misaligned lower seal housing can
press against the shaft seal causing the shaft seal to tilt.
2. Special wear-resistant shaft seals with tungsten-carbide sealing surfaces are available for purchase. These shaft seals can be used as a
direct replacement of the current shaft seal. For further information, contact Grundfos.
Do not reuse a worn shaft seal.
Do not dismantle and reassemble the shaft seal.
A
B
Leakage chamber
Leakage chamber plug
33