Watson-Marlow MR-Series - Manual (Page 21)

Revision 1.4 / August 2013 Visit our website at www.masosine.com 21
Pump Housing Rotation Instructions
The pump housing can be rotated to locate the inlet and outlet nozzles in the three different positions
shown in
Figure 11 . This allows for six different operating conditions based on the rotation of the pump
shaft. Figure 11 shows the various pumping orientations with arrows depicting shaft rotation. In the
diagram, the inlet and outlet nozzles have been marked "S" to depict suction and "D" to depict
discharge.
To rotate the pump housing to fit your inlet and outlet piping conditions, simply follow these
instructions:
1. Remove all of the parts from the wet end of the pump. Refer to the Wet End Disassembly section
of this manual.
2. Loosen and remove the housing mounting bolts, item 340, and the housing mounting washers,
item 345, which attach the pump housing, item 300, to the power frame, item 600. Warning:
Suitable lifting equipment should be used when removing and installing the pump housing
to ensure that personal injury or damage to pump components does not occur.
Figure 11 – Front Views (Rotation Instructions)
3. Rotate the pump housing such that the nozzles are in a desired position. Holes have already been
drilled in the rear of the pump housing to facilitate any position of the nozzles.
4. Place the pump housing back onto the power frame being sure to align the bolt holes of both
parts. Install the housing mounting washers and bolts and tighten to the torque specification on
page 28. NOTE: Failure to tighten the bolts to the specification may cause damage to the
wet end parts, as the rotor will not be centered in the housing properly.
5. Replace the parts in the wet end of the pump. Refer to the Wet End Assembly section of this
manual. Be sure to install the scrapergate and scrapergate guide in the correct position. Refer to
page 20.