1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
13
11/12/18
To check parallel alignment, a straight edge should be held against the edges of the coupling halves at any four places
90° apart around the coupling. The straight edge should be parallel to the pump and driver shafts at all times. Insert shims
until the straight edge lies flat against both coupling halves at all four checkpoints. The pump and driver will then be in
proper parallel alignment. Refer to Fig. 2.
For fine alignment, 3500 RPM operation, for all other coupler types.
A dial indicator should be used when greater alignment accuracy is required. Use the following alignment tolerances
unless specified otherwise by the coupling manufacturer. On sleeve type couplings make sure there is at least 1/8" end
clearance between the sleeve and the two coupling halves.
To check angular misalignments, mount the dial indicator base to the coupling half, and position the dial indicator button
on the front or rear face of the opposite coupling half. Set the dial to zero, rotate both coupling halves together, making
sure the indicator button always indicates off the same spot. Misalignment values within 0.004 inches TIR per inch of
coupler radius is permissible.
To check parallel misalignment, mount the dial indicator base to one coupling half, or shaft and position the dial indicator
button on the outside diameter of the opposite coupling half. Set the dial to zero. Rotate both coupling halves together,
making sure the indicator button always indicates off the same spot. Misalignment within 0.004 inches TIR is permissible.
PERIODIC CHECK:
Realign the base after piping from time to time while the unit and foundation are new. Coupling misalignment can occur
because of shifts in grouting, foundation or because of large objects going through the pump causing shock loading
conditions.
Coupling alignment should be checked periodically for changes. Coupling misalignment can lead to or cause bearing
failure, coupling failure, shaft breakage, high power consumption, etc.
AUXILIARY PIPING CONNECTIONS:
Install any additional piping connections your pump may require such as water seal piping, stuffing box drain, baseplate
drain, and pressure gauges.
NOTE:
For satisfactory pump operation and life, these auxiliary pipe lines must be kept clean.
STRAIGHT EDGE
PARALLEL MISALIGNMENT
ANGULAR MISALIGNMENT
WEDGE OR
THICKNESS GAUGE
PERFECT ALIGNMENT
Figure 2. Flexible Coupling Alignment.
