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2. 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.
3. 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.
Do not lift or move the pump by the shaft end.
Never rest a vertically tilted pump on its impeller.
8.5 Inspecting and adjusting the impeller clearance
®
For pumps with closed S-tube
the distance between the bottom of the impeller and stationary wear
ring mounted in the bottom of the volute.
For pumps fitted with open S-tube
distance between the bottom of the impeller and the suction cover.
The correct impeller clearance is required to maintain the hydraulic
performance of the pump and to prevent clogging.
Check the impeller clearance every time service is carried
out to prevent hot surfaces in the hydraulic parts.
impeller, the impeller clearance is
®
, the impeller clearance is the
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