Rotation of Suction and Discharge Ports

MAINTENANCE

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.

CAUTION - Stalled or Stopped Pump

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.

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. PumpWell (Clean-out)

WARNING - Lock Screw Torqueing

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.

PAGE 22 — MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11)

MQD2H specifications

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