Multiquip EM18804 4-1/2" Steel Ball

The Multiquip EM18804 is a genuine OEM 4-1/2" Steel Ball designed for the C30HD series concrete pumps, including the C30HDGA, C30HDZ, C30HDG, C30HDN, C30HDNI, and C30HD models. As a factory-sourced component, the EM18804 meets the exact material and dimensional standards set by Multiquip for these Mayco concrete pump models. This steel ball is a direct replacement that installs without modification, ensuring your pump returns to full operation quickly. Confirm your model code against the fitment list — the C30HD series shares this specification across multiple engine configurations.

Key Features

• Hardened Steel Construction — Manufactured to OEM hardness and diameter tolerances critical for maintaining consistent sealing pressure in concrete pump valve assemblies.
• Drop-In Replacement — Matched to the exact 4-1/2" diameter specification of the original component, seating correctly in the valve housing without additional fitting or machining.
• Broad C30HD Series Compatibility — Fits C30HDGA, C30HDZ, C30HDG, C30HDN, C30HDNI, C30HDNI Precision, C30HDNI Zenith, and C30HD models across multiple engine variants.
• Valve Integrity Under Pressure — A correctly sized and properly hardened steel ball maintains the check valve seal that keeps concrete flowing in one direction; a worn or undersized ball results in backflow, pressure loss, and pump failure.
• Genuine OEM Sourcing — Supplied as an authentic Multiquip part, so the ball material grade and surface finish match what the pump was originally engineered to run.

The 4-1/2" Steel Ball is a core component of the check valve system in cycloidal-drive concrete pumps like the C30HD series. It acts as the sealing element that controls the direction of concrete flow through the pump — sitting against a valve seat to block backflow when the piston reverses. When the ball becomes worn, pitted, or out-of-round from abrasive concrete aggregate, the valve can no longer seal completely, causing pressure drop, erratic output, and material pumping back through the line. Replacing the steel ball at the first sign of wear restores proper valve function and protects downstream pump components from the added stress of an inefficient system.

DHS Equipment stocks genuine Multiquip OEM parts to help you get the right component the first time. If you need help confirming fitment for your specific C30HD model configuration, contact our parts team for assistance.

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.