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PAGE 22 — MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11)
Rotation of Suction and Discharge Ports
In some applications, it may be preferable to have suction/
discharge ports rotated 90° (Figure 22) to be in-line with the
pump wheels. Perform the following procedure to rotate ports:
1. Remove the four hex head cap screws, hex nuts, flat
washers and lock washers from the pump base.
2. Push pump well downwards to separate from pump
base.
3. Rotate pump well 90° clockwise so that driver is
positioned over top of discharge plate.
4. Align pump well, pump base, and diaphragm with each
other. Once all components have been properly aligned,
reinstall the four hex head cap screws, hex nuts, flat
and lock washers and tighten securely.
Figure 22. Suction/Discharge Port Rotation
Clearing a Jam-Up
If large solids or an accumulation of sand or other sediment
becomes lodged in the pump well, preventing the plunger
arm from making a full stroke; the pump may stall, the crank
could slip on the output shaft, or the plunger arm could incur
extreme damage and shear.
If a jam-up does occur, the pump should be thoroughly
cleaned as described on the “Pump Stalls” section.
Stalled Pump
If pump has stalled for any unknown reason perform the
following:
1. Remove handle from pump. See Figure 6.
2. Remove the four hex head cap screws, hex nuts, flat
washers and lock washers from the pump base.
3. Push pump well downwards (Figure 23) to separate from
pump base.
4. Clean and remove all dirt and debris from pump well.
5. Align pump well, pump base, and diaphragm with each
other. Once all components have been properly aligned,
reinstall the four hex head cap screws, hex nuts, flat
and lock washers and tighten securely.
Figure 23. Pump Well (Clean-out)
If pump has stopped or stalled for any unknown reason,
clean out pump cavity (well)
thoroughly. Failure to
comply could result in damage to plunger arm or other
internal pump components.
CAUTION - Stalled or Stopped Pump
Pump jamming with an over-torqued lock screw (plunger
arm) may cause internal damage. Under torqueing may
allow the output shaft to spin and wear parts prematurely
causing replacement.
WARNING - Lock Screw Torqueing
MAINTENANCE