The Multiquip 337040290 is a genuine OEM Gearbox Assembly Complete 3-Inch Input/Output Half Etched Starts With 335, designed for MQD2HA and MQD3HA diaphragm pump models. As a direct OEM replacement sourced from Multiquip, this assembly maintains the exact engineering tolerances required for proper gear mesh, shaft alignment, and power transfer within the pump drive system. Confirm your unit's model code before ordering — this assembly is specifically validated for the MQD2HA and MQD3HA platforms. Stocking this part ahead of scheduled maintenance keeps your diaphragm pump ready for continuous operation on the jobsite.
Key Features
- OEM-Matched Gear Tolerancing — Manufactured to Multiquip's exact specifications, ensuring correct gear mesh and backlash for full power transmission through the 3-inch input/output shaft.
- Complete Drop-In Assembly — Supplied as a complete gearbox unit, so all internal components are pre-assembled and ready to install as a single replacement rather than individual parts.
- Confirmed Fitment for MQD2HA and MQD3HA — Validated for Multiquip MQD2HA and MQD3HA diaphragm pumps; verify your model code before ordering.
- Sustained Pump Drive Performance — A properly functioning gearbox delivers consistent rotational force to the diaphragm mechanism; a worn or damaged gearbox causes erratic pumping, output loss, and accelerated wear on surrounding components.
- Genuine OEM Part from Multiquip — Part number 337040290 is sourced directly through Multiquip's OEM supply chain, ensuring the assembly matches the original design intent of the MQD series pump platform.
The gearbox assembly in a diaphragm pump transfers rotational power from the engine or motor to the reciprocating mechanism that drives the diaphragm back and forth, creating the pumping action. On 3-inch models like the MQD2HA and MQD3HA, the gearbox must handle significant torque loads while maintaining precise timing to protect the diaphragm and valve components from shock loading. When the gearbox wears or fails, symptoms typically include loss of pumping pressure, irregular flow, unusual noise from the drive housing, or complete stoppage — all of which point to internal gear damage or bearing failure within the assembly.
Part Details
| Part Number | 337040290 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Gearbox Assembly Complete 3-Inch Input/Output Half Etched Starts With 335 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
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