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MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #7 (05/24/13) — PAGE 13
Figure 2 shows a typical application using the MQD2H or MQD3H diaphragm pump. Please note that this pump is intended for the
removal of clean water and water containing some debris and solids. Maximum size of solids for the MQD2H should not exceed 1-
1/2 inches (38.1 mm) in diameter, and maximum size of solids for the MQD3H should not exceed 1-5/8 inches (41.275) in diameter.
DO NOT set strainer on bottom of water bed. Placing the strainer above the water bed will prevent the pump from drawing in
excessive amounts of sand and foreign debris.
1. Pump – The Multiquip Models MQD2H and MQD3H are
2-inch and 3-inch diaphragm pumps respectively and are
used in general de-watering applications. Typical
dewatering applications consist of cleaning out cesspools
and septic tanks, draining slow seepage from small
excavations, trenches and construction sites, or pumping
out industrial waste.
2. Priming Plug/Suction Priming Chamber – To help
facilitate faster priming operations, fill chamber with clean
water and secure priming plug.
3. Discharge Port – Connect either a 2-inch or 3-inch
discharge hose to this port depending on pump model.
4. NPT Connection – Used to secure the hose to the inlet
and outlet ports on the pump.
5. Discharge Hose – Connect a flexible rubber hose to the
discharge port on the pump. Make sure that the hose lays
flat and is not kinked. Use only recommended type discharge
hose. Contact Multiquip parts department for ordering
information.
Figure 2. MQ-D2H/D3H Pump Application
MQ-D2H/D3H — PUMP COMPONENTS
6. Suction Port – Connect either a 2-inch or 3-inch inlet
hose to this port depending on pump model.
7. Suction Hose – Connect a flexible rubber hose to the
suction port on the pump. Make sure that the hose lays flat
and is not kinked. Use only recommended type suction hose.
Contact Multiquip parts department for ordering information.
8. Strainer – Always attach a strainer to bottom side of the
suction hose to prevent large objects and debris from
entering the pump. Strainer should be positioned so that it
will remain completely under water.
9. Transmission Oil Fill Plug – Remove this plug to add
SAE 80/90 EP (API GL-5) gear oil to the transmission.
Transmission oil capacity is 22 ounces (651 ml.).
10. Connecting Rod Grease Access Hole – Grease
connecting rod bearing through this access hole. Grease
connecting rod bearing every 25 hours of operation.
NOTE
Contact your nearest Multiquip
dealer for quick disconnect hoses
and fittings.
COMPONENTS