Multiquip MQD3HA 3″ Diaphragm Pump – Honda GX120 Engine

Product Description

High-Volume Diaphragm Pump for Muddy Water, Sludge & Heavy Solids

The Multiquip MQD3HA is a 3-inch gas-powered diaphragm pump engineered for higher-volume pumping of muddy water, sludge, and debris-laden fluids on demanding construction and utility jobsites. A positive displacement diaphragm design allows the MQD3HA to perform reliably where centrifugal trash pumps may clog or lose prime.

Powered by a Honda GX120 3.5 HP gasoline engine, the MQD3HA provides increased flow capacity for crews that need to move more material per minute while maintaining dependable operation in high-solids conditions.

Multiquip MQD3HA 3″ Diaphragm Pump Key Specifications

Specification

Details

Pump Type

Positive displacement diaphragm pump

Suction / Discharge Size

3″ × 3″ NPT

Maximum Flow

90 GPM (322–342 LPM)

Maximum Lift / Head

25 ft (7.6 m)

Maximum Solids Handling

Up to 1-5/8″ diameter

Engine

Honda GX120 gasoline engine

Horsepower

3.5 HP

Fuel Tank Capacity

2.1 qt (2 L)

Maximum Fluid Temperature

180°F (82°C)

Drive

Enclosed gears with oil-bath lubrication

Mobility

Integrated wheel kit included

Operating Weight

175 lb (79 kg)

Where the Multiquip MQD3HA Is Best Used

The MQD3HA is purpose-built for larger-volume pumping applications involving muddy water and heavy solids, including:

Construction site dewatering

Large excavations and trenches

Utility and municipal maintenance work

Sludge and debris-laden fluid transfer

Rental fleet and contractor use

Its diaphragm design makes it especially effective in environments with variable water levels, slow seepage, and high solids content.

MQD3HA vs. 2″ Diaphragm Pumps

Feature

MQD3HA (3″ Diaphragm Pump)

2″ Diaphragm Pumps

Discharge Size

3″

2″

Maximum Flow Rate

90 GPM

50 GPM

Solids Handling

Up to 1-5/8″

Up to 1-5/8″

Maximum Lift / Head

25 ft

25 ft

Primary Advantage

Higher throughput

Smaller, lighter footprint

Best Use Case

Larger-volume jobsite pumping

Smaller-scale dewatering

The MQD3HA is designed for operators who need more throughput, not more pressure, making it a practical step-up option for higher-volume jobsite applications.

Why Choose the Multiquip MQD3HA?

Positive Displacement Diaphragm Performance

The MQD3HA uses a reciprocating diaphragm pumping action to move high-viscosity liquids and debris-laden fluids efficiently. This design maintains pumping performance in conditions that often reduce the effectiveness of centrifugal trash pumps.

High-Volume Solids Handling

With the ability to pass solids up to 1-5/8 inches while delivering up to 90 GPM, the MQD3HA is well suited for muddy water, sludge, and debris that require faster removal on larger jobsites.

Reliable Honda GX120 Engine

The Honda GX120 engine provides reliable starting, consistent power output, and easy serviceability, making it a familiar and trusted platform for contractors and rental fleets.

Enclosed Gear Drive for Durability

An oil-bath lubricated, enclosed gear system helps reduce wear and supports long service life in demanding jobsite environments.

Built for Jobsite Mobility

The integrated wheel kit allows the MQD3HA to be moved easily across uneven terrain, reinforcing its role as a practical, jobsite-ready diaphragm pump despite its higher capacity and heavier build.

What This Diaphragm Pump Is Not Intended For

For proper application and performance:

Not designed for clean-water or irrigation use

Not a replacement for high-flow centrifugal trash pumps in low-solids applications

Not intended for continuous high-pressure deadheading

Shop the Multiquip MQD3HA Diaphragm Pump at Cleanflow

The Multiquip MQD3HA diaphragm pump is a dependable choice for contractors and professionals who need higher-volume pumping performance when handling muddy water, sludge, and debris-laden fluids.

Founded in 1973, Multiquip has built a long-standing reputation for manufacturing professional-grade construction equipment trusted by contractors, municipalities, and rental fleets worldwide. The MQD3HA reflects that legacy through its practical design, proven Honda power, and jobsite-ready performance.

If you need help confirming specifications or selecting accessories, Cleanflow’s team is ready to assist.

FAQs

What type of pump is the MQD3HA?

It is a 3-inch positive displacement diaphragm pump designed for muddy water and high-solids applications.

How much water can it pump?

Up to 90 gallons per minute, depending on conditions.

What size solids can it handle?

Up to 1-5/8″ diameter solids.

Is the MQD3HA suitable for muddy water and sludge?

Yes. It is specifically designed for mud, sludge, and debris-laden fluids.

Does the MQD3HA include a wheel kit?

Yes. The wheel kit is included for easier jobsite transport.

Does the pump need to be primed before use?

Yes. Filling the priming chamber with clean water helps ensure proper suction during startup.

Can the suction and discharge ports be repositioned?

Yes. The suction and discharge ports can be rotated 90 degrees for flexible hose routing on tight jobsites.

What maintenance is required?

Routine maintenance includes checking engine oil, maintaining proper transmission oil levels, keeping the strainer clean, and greasing the connecting rod bearing every 25 hours of operation.