Your cookie preferences
We use cookies to remember your preferences and understand how shoppers use our site, helping us improve your shopping experience.
Read our privacy policy
1-800-397-1392
Closed Until MondayMultiquip Diaphragm Pump | 3.5 HP | Sand-Cast Aluminum | Recoil Start | Max 90 GPM | Max 25 ft. Head | Honda GX120 | MQD3HA
Ships in 3-5 Business Days
By
Multiquip
In stock
Model
MQD3HA
ID
240946
Was $2,931.00 Your Low Price Special Price $2,371.00
Product Features
- Diaphragm Performance: Pumps up to 90 GPM with 25 ft. maximum lift.
- 3.5 HP Honda Engine: GX120 gasoline engine delivers dependable pumping power.
- 3" Ports: NPT suction and discharge support high-volume fluid transfer.
- 1-5/8" Solids Handling: Moves muddy water, sludge, and debris-filled fluids.
- Run-Dry Capability: Operates dry without damaging the pump.
- Heavy-Duty Construction: Sand-cast aluminum body provides lasting durability.
Multiquip MQD3HA 3-Inch Diaphragm Pump
The Multiquip MQD3HA is a 3-inch positive displacement diaphragm pump designed for moving muddy water, sludge, sewage, and other heavy debris-laden fluids. Its diaphragm design provides dependable self-priming performance and allows the pump to run dry without damage, making it well suited for demanding dewatering applications where conventional centrifugal pumps may struggle.
Powered by a 3.5 HP Honda GX120 gasoline engine, the MQD3HA delivers up to 90 GPM with a maximum 25-foot head and 25-foot suction lift. A durable sand-cast aluminum pump housing, oil-bath lubricated gear transmission, integrated wheel kit, and tubular steel handle provide a practical package for construction, excavation, flood response, agricultural, municipal, and industrial dewatering work.
Product Features:
- 90 GPM pumping capacity: Moves up to 90 gallons per minute for demanding drainage and fluid-transfer applications.
- 25 ft. maximum head: Provides up to 25 feet of total pumping head for jobsite dewatering and fluid transfer.
- 25 ft. maximum suction lift: Provides strong suction capability for drawing water from below the pump location.
- 3-inch connections: Uses replaceable 3-inch NPT male suction and discharge nipples for compatible hoses and fittings.
- 1-5/8-inch solids handling: Pumps fluids containing solid material up to 1-5/8 inches in diameter.
- Positive displacement diaphragm: Handles muddy water, sludge, high-viscosity liquids, and heavily debris-laden fluids while providing strong self-priming characteristics.
- Santoprene diaphragm: Thermoplastic Santoprene construction provides flexibility, elasticity, abrasion resistance, and durability.
- Honda GX120 engine: Powered by a 3.5 HP, 119 cc four-stroke OHV gasoline engine with recoil starting and low-oil shutdown protection.
- Oil-bath gear transmission: Enclosed gears, pinions, and support bearings receive continuous oil-bath lubrication for dependable pump operation.
- Easy transportation: Heavy-duty solid flat-free wheels, a tubular steel handle, and a center lifting point simplify movement and handling around the jobsite.
What Is a Diaphragm Pump?
A diaphragm pump uses the reciprocating movement of a flexible diaphragm to create suction and discharge pressure. This positive displacement design is particularly effective for fluids containing mud, sludge, sand, sewage, and other debris. Unlike many centrifugal pumps, the MQD3HA is designed to maintain useful pumping performance in applications involving heavy solids and can operate dry without damaging the pump mechanism.
Performance and Fluid Handling
The MQD3HA provides a maximum capacity of 90 GPM, with a maximum head of 25 feet and a maximum suction lift of 25 feet. Its 3-inch suction and discharge ports allow the pump to move larger volumes of heavily contaminated water while minimizing restrictions through the pump end.
The pump can handle solids up to 1-5/8 inches in diameter and fluids with temperatures up to 180°F. It is designed for muddy water, silt, sand, sludge, sewage water, standing water, excavation drainage, flood response, irrigation, septic applications, and other demanding fluid-transfer jobs.
Diaphragm and Pump Construction
The MQD3HA uses a thermoplastic Santoprene diaphragm engineered for flexibility, elasticity, and durability. Separate check valves on the suction and discharge sides help maintain prime and support consistent fluid movement through the pump.
The sand-cast aluminum pump housing provides a durable pump structure while supporting rapid priming and efficient fluid flow. A suction priming chamber helps optimize flow and provides additional resilience when the pump experiences sudden, momentary internal pressure demands.
Heavy-Duty Gear Drive
A two-stage heavy-duty forged gear-driven transmission operates the diaphragm at approximately 60 strokes per minute. The enclosed gears, pinions, and support bearings use oil-bath lubrication to reduce wear and provide smooth, reliable operation.
Honda GX120 Engine
The MQD3HA is powered by a Honda GX120 air-cooled, four-stroke, single-cylinder OHV gasoline engine with a 119 cc displacement. The engine is rated at 3.5 HP for the pump application and uses recoil starting, centrifugal-mass governor control, dual-element air filtration, and a low-oil shutdown system.
The 0.7-gallon fuel tank provides approximately 2.7 hours of continuous operation at the specified fuel consumption. The engine uses SAE 10W-30 oil and has a 0.63-quart oil capacity.
Priming and Dry-Run Capability
The positive displacement diaphragm configuration provides strong self-priming characteristics without requiring the same wet-priming approach used by many conventional centrifugal pumps. The neoprene check valve helps retain water in the pump casing for easier startup and helps maintain prime during operation.
The MQD3HA can run dry without damage, which makes it particularly useful for applications involving slow seepage, fluctuating water levels, and intermittent flow. When pumping heavily contaminated water, the pump should be flushed after use to help prevent debris buildup and clogging.
Jobsite Mobility
The MQD3HA includes an integrated heavy-duty wheel kit with solid flat-free wheels and a tubular steel handle for easier transportation. A center lifting point provides another option for positioning or relocating the pump where lifting equipment is available.
90-Degree Rotatable Base
A 90-degree rotatable base provides additional installation flexibility, allowing the pump configuration to better accommodate different hose routing and jobsite arrangements.
Available Hose and Coupling Options
Multiquip lists several compatible 3-inch hose and coupling options for the MQD3HA, including HS320C and HS325C suction hoses, HSQ320C and HSQ325C suction hoses with quick-disconnect couplers, HD350C and HDQ350C discharge hoses, and A300A 3-inch quick-disconnect couplers.
Warranty
The Multiquip MQD3HA pump is backed by a 2 Year Warranty from the date of purchase. The Honda GX120 engine carries a 3 Year Warranty, while hoses are covered for 3 months, subject to Multiquip's applicable warranty terms and conditions.
Heavy-Duty 3-Inch Diaphragm Pump for Mud, Sludge, and High-Solids Dewatering
The Multiquip MQD3HA is a professional-grade 3-inch diaphragm pump engineered for difficult dewatering applications involving muddy water, sludge, silt, sand, sewage water, and other high-solids fluids. Its positive-displacement diaphragm design delivers up to 90 gallons per minute with a maximum suction of 25 feet and maximum head of 25 feet, making it especially effective for slow-seepage applications where conventional centrifugal pumps may have difficulty maintaining prime.
Designed to handle challenging debris-laden fluids, the MQD3HA can pass solids up to 1-5/8 inches in diameter and handle liquids at temperatures up to 180°F. Its high-efficiency thermoplastic Santoprene diaphragm provides excellent flexibility and durability, while separate neoprene check valves at the suction and discharge ports help maintain prime and promote dependable fluid movement.
Why Choose the Multiquip MQD3HA Diaphragm Pump?
Built for Mud, Sludge, and High-Solids Water
- Positive-displacement design effectively moves high-viscosity and heavily debris-laden fluids.
- Ideal for muddy water, sludge, silt, sand, sewage water, and standing water.
- Well suited for slow-seepage conditions where centrifugal pumps may lose prime.
90 GPM Pumping Performance
- Delivers up to 90 GPM of maximum published pumping capacity.
- Provides up to 25 feet of maximum head.
- Produces up to 10.9 PSI of published pressure.
Strong 25-Foot Suction Capability
- Provides up to 25 feet of maximum suction.
- Suction priming chamber helps promote optimum fluid flow.
- Designed to withstand sudden, momentary internal pressure demands.
Handles Solids up to 1-5/8 Inches
- Passes solids up to 1-5/8 inches in diameter.
- Designed for fluids containing substantial suspended debris.
- Large-solids capability makes it suitable for demanding construction and municipal applications.
Built-In Jobsite Mobility
- Heavy-duty wheel kit is included with the pump.
- Solid flat-free wheels eliminate concerns about pneumatic tire punctures.
- Tubular steel handle and center lifting point simplify transportation and placement.
Efficient Portable Gasoline Operation
- 0.7-gallon fuel tank supports approximately 2.7 hours of published runtime.
- Published fuel consumption is approximately 0.26 gallons per hour.
- Recoil starting allows operation without an external electrical supply.
Versatile Professional Applications
- Suitable for construction sites, excavations, floods, and jobsite drainage.
- Useful for septic tanks, farms, irrigation, mining, municipalities, and site preparation.
- Can support emergency response and water-supply applications using lakes and rivers.
Rugged Mobile Pump Package
- Latest published dimensions are approximately 41.5 x 30.0 x 22.0 inches.
- Latest published dry weight is approximately 140 pounds.
- Integrated wheels, handle, and lifting point simplify movement around demanding jobsites.
Write Your Own Review
Customer Questions