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I N S T A L L A T I O N , O P E R A T I O N A N D M A I N T E N A N C E M A N U A L
3.4
The pump unit has been manufactured to allow field alignment. The unit must be properly
aligned at the time of installation. Reliable trouble-free and efficient operation of a unit depends
upon correct alignment. Misalignment may be the cause of noisy pump operation, vibration,
premature bearing failure, or excessive coupling wear. Factors that may change the alignment
of the pumping unit are settling of the foundation, springing of the base plate, piping strains, a
shift of the pump or drive on the foundation. When the checking coupling alignment, remember
flexible couplings are not intended to be used as universal joints. The Purpose of a flexible
coupling is to compensate for temperature changes and to permit end movement of the shafts
without interference with each other.
Two types of misalignment may exist: Parallel Misalignment and Angular misalignment. Limits
of misalignments are stated in the coupling manufacturer's instructions, but should be kept to a
minimum for maximum life of equipment components.
To check coupling alignment, the following procedure should be followed:
both coupling halves at four points 90°C apart. Correct alignment occurs when the
straight edge is level across the coupling halves at all points.
Correct the alignment occurs when the same gauge just enters between the halves at all
four points.
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P a g e
COUPLING ALIGNMENT.
Set the coupling gap to the dimension shown on the outline drawing.
Check for parallel misalignment by placing a straight edge across
Check angular misalignment with a feeler gauge at four points.
D E C C A N I N D U S T R I E S
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