The Multiquip 21380-001 Plunger Bearing is a genuine OEM component designed for MQD3HA, MQD2HA, MQD3H, and MQD2H diaphragm pumps. As a factory-sourced part, it meets the exact tolerancing and load specifications required to keep the pump plunger operating smoothly under continuous reciprocating motion. Verified fitment covers the full MQD diaphragm pump family, so you can order with confidence knowing this bearing drops straight into your machine.
Key Features
- OEM Precision Tolerancing — Manufactured to exact dimensional specs for the plunger bore, ensuring correct radial clearance and load distribution throughout the bearing's service life.
- Direct-Fit Replacement — Matches the original bearing seat geometry in MQD diaphragm pump models, allowing straightforward removal and installation without reworking the housing.
- Confirmed Fitment — Compatible with MQD3HA, MQD2HA, MQD3H, and MQD2H diaphragm pumps sold under the Multiquip product line.
- Smooth Plunger Stroke — A correctly seated bearing maintains consistent plunger alignment, supporting steady fluid displacement and preventing uneven wear on the plunger rod and seals.
- Genuine Multiquip OEM Part — Sourced directly through the Multiquip parts program; part number 21380-001 is the factory-authorized bearing for these pump models.
The plunger bearing supports the reciprocating plunger rod inside a diaphragm pump, keeping it centered and aligned as it moves back and forth to displace fluid. Without a properly functioning bearing, the plunger can run off-axis, accelerating wear on the rod, the diaphragm, and surrounding seals — eventually leading to fluid leakage or a loss of pumping pressure. Replacing a worn plunger bearing at the first sign of excessive play or noise restores smooth, efficient pump operation and protects the surrounding components from secondary damage.
Part Details
| Part Number | 21380-001 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Plunger Bearing |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD3HA |
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3H |
| Diaphragm Pumps | MQD2H |
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.
