Multiquip EM98051 Orange Piston Cup

The Multiquip EM98051 Orange Piston Cup is a genuine OEM component designed for the C30HDNI, C30HDN, C30HDG, C30HDGA, and C30HDZ series Mayco concrete pumps. As a direct Multiquip OEM part, EM98051 meets the original engineering specifications for these machines, ensuring consistent sealing performance within the pumping cylinder. This cup is compatible across the C30HD family, including Precision, Zenith, and standard variants, making it a reliable choice for operators servicing multiple configurations within the same fleet.

Key Features

• Genuine OEM Sealing Material — Molded from orange-grade polyurethane compound specified for concrete pump cylinder pressure demands, maintaining seal integrity under continuous reciprocating load.
• Direct Drop-In Replacement — Engineered to the same dimensions as the original piston cup, seating correctly in the cylinder bore without machining or fitting adjustments.
• Broad C30HD Family Coverage — Confirmed fit for C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDGA, and C30HDZ pump models.
• Sustained Output Pressure — A correctly seated piston cup maintains the pressure differential needed to push concrete through the delivery line; a worn or cracked cup causes pressure loss, reduced output, and mix blowback.
• Pump Safety Compliance — Maintaining a sound piston cup prevents hydraulic fluid and concrete mix from bypassing the piston, reducing the risk of uncontrolled pressure release in the cylinder circuit.

The piston cup is a critical wear component inside the pumping cylinder of a concrete pump. It seals against the cylinder wall and creates the pressure differential that forces concrete mix through the delivery system on each forward stroke. As the cup wears, it loses its ability to hold pressure, causing output to drop, strokes to become inconsistent, and mix to bypass back past the piston. Regular inspection and timely replacement of the piston cup keeps the pump delivering at rated capacity and protects the cylinder bore from abrasive damage caused by mix bypassing a failed seal.

Part Details

Compatibility & Fitment

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.