The Multiquip 21340 Plunger Arm is a genuine OEM component designed for MQD2H, MQD3H, MQD2HA, and MQD3HA diaphragm pumps. As a direct OEM replacement, it is manufactured to the same specifications as the original part, ensuring a correct fit within the pump's drive mechanism. This part is verified compatible across the MQD2H and MQD3H series, covering both standard and HA configurations. Sourcing the correct plunger arm by part number 21340 is the surest way to restore your diaphragm pump to full working condition.
Key Features
- Genuine OEM Construction — Manufactured to the same dimensional and material tolerances as the original, ensuring the plunger arm delivers the correct stroke geometry within the pump's drive assembly.
- Direct-Fit Replacement — Engineered to install in the same mounting position as the factory part, with no reworking of surrounding components required.
- Broad Diaphragm Pump Compatibility — Confirmed fitment for MQD2H, MQD3H, MQD2HA, and MQD3HA diaphragm pumps, covering both 2-inch and 3-inch model variants.
- Consistent Pumping Stroke — A correctly functioning plunger arm maintains the precise reciprocating motion that drives the diaphragm; a worn or bent arm causes uneven stroke, reduced flow, and accelerated diaphragm wear.
- Verified by Part Number — Ordering by Multiquip part number 21340 eliminates compatibility guesswork and ensures you receive the exact component for your pump model.
The plunger arm is a core mechanical link in a diaphragm pump's drive train, converting rotational engine power into the back-and-forth motion that flexes the diaphragm and moves fluid through the pump. It connects the eccentric drive mechanism to the diaphragm itself, so its condition directly determines stroke consistency and overall pump output. When a plunger arm bends, wears at its pivot points, or fails entirely, the diaphragm loses its proper range of motion, resulting in a significant drop in flow rate or a complete loss of pumping action.
For questions about fitment or to confirm this is the right part for your equipment, contact the DHS Equipment parts team.
Part Details
| Part Number | 21340 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Plunger Arm |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2H |
| Diaphragm Pumps | MQD3H |
| 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.
