The pump is provided with a factory-aligned shaft coupling. The shaft coupling may be misaligned during
pump installation or piping. When pump installation or piping is completed, check the alignment and realign it
if necessary. If you continue to operate the pump with the shaft coupling misaligned, the pump may fail at
an early stage. Also, before fitting the belt and coupling bolts, be sure to check the rotation direction of the
e
lectric motor. Revere rotation may take the impeller off, resullting in damage to the pump.
【Belt-driven type】
Before fitting the belt, check the pulley groove for contamination. Move the electric motor from
side to side and fit the belt so that the belt is not overloaded.
Use a straight edge or leveling string to avoid misalignment. Adjust the belt to the proper tension
with the adjusting bolt on the electric motor. Avoid overtension and undertension.
After a new belt is fitted, the belt may slightly stretch. Be sure to check the belt tension and
adjust it as necessary.
Be sure to replace all the belts at a time instead of the worn belt only.
※ For the proper belt tension, contact your dealer or the product manufacturer.
【Direct-driven type】
Loosen the motor mounting bolts. Make an adjustment
with a straight edge so that the circumference of the right
coupling aligns with that of the left and clearance (a) is
uniform on the left, right, top, and bottom.
After the adjustment, tighten the mounting bolts and check
the alignment again. Then, put the coupling bolts.
θ ≦ 10°(2.9mm per meter)
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θ
Procedures for aligning the shaft coupling
θ
Achieve the proper belt tension.
Straight edge
(a)