The Multiquip 15170 is a genuine OEM Square Key 3/16" x 1-1/2" designed for MQD2H, MQD2HA, MQD3H, and MQD3HA diaphragm pump models. As a direct OEM replacement, this square key is manufactured to the exact dimensions required for correct torque transfer between the shaft and driven component on Multiquip diaphragm pumps. Sourced directly through authorized Multiquip supply channels, part 15170 ensures you are installing a component that meets the original engineering specification. If your pump is showing signs of slippage, vibration, or loss of drive, replacing this key with the correct OEM part is a fast, low-cost fix that restores full power transmission.
Key Features
- Exact OEM Dimensions: — Manufactured to the precise 3/16" x 1-1/2" specification, ensuring correct seating in the keyway without shimming or filing.
- Genuine Multiquip OEM Component: — Sourced from Multiquip's authorized parts program, confirming material grade and dimensional accuracy for this drive application.
- Direct Fitment for MQD Diaphragm Pumps: — Confirmed fit for MQD2H, MQD2HA, MQD3H, and MQD3HA pump models — drop-in replacement with no rework required.
- Restores Full Shaft-to-Drive Engagement: — A worn or sheared square key causes slippage and loss of pump output; replacing with part 15170 restores solid mechanical engagement and full diaphragm stroke.
- Low-Cost Preventive Component: — Inspecting and replacing square keys during routine service intervals prevents shaft and keyway damage that is far more costly to repair.
A square key is a small but critical drive component that locks a rotating shaft to a hub, gear, sprocket, or impeller, transferring torque between them. On diaphragm pumps like the MQD2H and MQD3H, the square key keeps the drive shaft positively engaged with the pump mechanism so that every revolution of the engine translates directly into pumping action. When a square key wears, shears, or works loose, the shaft spins freely inside the hub, the pump loses drive entirely, and continued operation can cause accelerating damage to the keyway surfaces on both the shaft and the mating component.
For fitment questions or help confirming compatibility with your specific unit, contact the DHS Equipment parts team.
Part Details
| Part Number | 15170 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Square Key 3/16" x 1-1/2" |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
| Diaphragm Pumps | MQD2H |
| Diaphragm Pumps | MQD3H |
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.
