Multiquip MQD2H manual Seized Plunger, Diaphragm Replacement, Maintenance

MAINTENANCE

Seized Plunger

If the plunger arm has seized, perform the following:

1.Remove plunger guard (Figure 24) by turning guard hand knob counterclockwise to loosen.

2.Disassemble pump and clean as described in steps 1 thru 4 in the "Stalled Pump" section.

3.Using a torque wrench, torque lock screw (Figure 24) to 70 ft.-lbs. (9.6 kg-m).

Diaphragm Replacement

1.Remove plunger cover as shown in step 1 of the "Seized Plunger" section.

2.Remove handle as shown in Figure 6 of the "Handle Installation" section.

3.Rotate pump output shaft until plunger arm is in the down position.

4.Remove the four hex head cap screws, hex nuts, flat washers and lock washers from the pump base.

5.Push pump well downwards to separate from pump base.

6.Remove the three carriage bolts (Figure 25) that secure the diaphragm to the plunger arm base. Remove diaphragm.

7.Replace diaphragm, reassemble in reverse order.

Figure 24. Lock Screw Torqueing

Figure 25. Diaphragm Replacement

MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11) — PAGE 23