The Multiquip 50417 Piston Cup is a genuine OEM replacement designed for LS-40, LS40D, LS40TD, LS50TD, LS60TD, LS300, LS300G, LS300GK, LS300P, LS400, LS450, LS500, LS600, LS600P, and ST-45HRM hydraulic-driven concrete pumps. As a factory-authorized component, the part meets the original design tolerances required to maintain consistent cylinder pressure and pumping output across this broad range of Mayco and Multiquip pump models. Sourcing a genuine OEM Piston Cup ensures the part seats and seals exactly as the manufacturer intended, protecting the cylinder bore and maintaining pumping efficiency. DHS Equipment stocks the Multiquip 50417 so you can get your concrete pump back in service without delay.
Key Features
- Genuine OEM Seal Material — Manufactured to the original compound and durometer specification, delivering the compression consistency required to maintain cylinder pressure in hydraulic concrete pump applications.
- Direct Cylinder Drop-In — Engineered to the exact bore dimensions of the LS and ST series pump cylinders, allowing straightforward installation without machining or shimming.
- Broad LS and ST Series Coverage — Confirmed fitment for LS-40, LS40D, LS40TD, LS50TD, LS60TD, LS300, LS300G, LS300GK, LS300P, LS400, LS450, LS500, LS600, LS600P, and ST-45HRM models.
- Sustained Output Pressure — A correctly seated Piston Cup maintains the hydraulic seal needed to push concrete through the delivery line at rated capacity; a worn or cracked cup causes pressure drop and uneven flow.
- Pressure Integrity Under Load — Concrete pumping generates sustained hydraulic pressure cycling; a genuine OEM cup is formulated to resist cracking, swelling, and extrusion under continuous operational loads, reducing premature seal failure.
The Piston Cup forms the primary sealing element inside the pump cylinder, creating a pressure-tight barrier between the hydraulic piston and the concrete-side of the cylinder bore. As the piston strokes, the cup flexes against the cylinder wall to build and hold the pressure needed to move concrete through the delivery line. When the cup wears, hardens, or tears, cylinder pressure drops, pumping output becomes inconsistent, and concrete may fail to reach full delivery distance. Replacing the Piston Cup at the first sign of pressure loss restores full pump performance and prevents additional wear to the cylinder bore.
For fitment questions or to confirm this part is correct for your specific serial number, contact the DHS Equipment parts team directly.
Part Details
| Part Number | EM50417 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Piston Cup |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | LS-40 |
| Mayco Pumps | LS40TD |
| Mayco Pumps | LS50TD |
| Mayco Pumps | LS400 |
| Mayco Pumps | LS500 |
| Mayco Pumps | LS600 |
| Mayco Pumps | LS600P |
| Mayco Pumps | LS300 |
| Mayco Pumps | LS300G |
| Mayco Pumps | LS300GK |
| Mayco Pumps | LS300P |
| Mayco Pumps | LS60TD |
| Submersible Pumps | ST-45HRM |
| Submersible Pumps | ST-70 |
| Mayco Pumps | LS450 |
| Mayco Pumps | LS40D |
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.
