10
4.5- Coupling Adjustment
After installation of the baseplate and system
connections, the coupling adjustment should be controlled
finally. The reason that proper adjustment of the entire
system is responsibility of the purchaser.
“Coupling Adjustment” is to ensure that the
rotation axes of the motor and pump should be on the same
plane. SDS type pumps are ordered with motor and
baseplate, they are delivered with the coupling adjustments
made at the factory. However, this adjustment may be easily
impaired during transportation, handling, installation on
site and installation of the system. For this reason, the
coupling adjustment should be performed again after
installation of the group on site, disregarding the adjustment
made at the factory.
• The most important factor for problem-free operation of
the pump group is correct coupling adjustment. The basic
reason of a number of problems such as vibration, noise,
bearing heating and overload is a coupling unadjusted or
improperly adjusted. For this reason, coupling adjustment
should be performed very well and controlled frequently.
• Elastic coupling should not be regarded as a component to
correct an improper adjustment. Elastic coupling does not
correct a poor axial adjustment between the pump and motor
and does not remove excessively poor adjustments.
• A metal part (steel ruler or gauge, etc.) and a precise caliper
are required to perform coupling adjustment (special
equipment should be used for very fine and precise
adjustment). Axial run-out of the coupling
(see Figure 5)
should not exceed 0.1 mm.
• There may be two types of adjusting mistakes on the
coupling:
a) Angular mistake
b) Parallel displacement mistake
• In order to control the angular mistake, the distance
between two parts of the coupling should be measured
mutually on horizontal and vertical planes. The clearances
measures at these four points should be equal
(Figure 6a,6b)
.
ATTENTION
ATTENTION
a
Fig 5.
Alligning a flexible coupling
Fig 6a.
Angle error in horizontal plane
and adjustment
Fig 6b.
Angle error in vertical plane and
adjustment
Fig 6c.
Parallel sliding error in
horizontal plane and adjustment.
Fig 6d.
Parallel sliding error in vertical
plane and adjustment.
