Multiquip EM903176 Conn Rod Bearing

The Multiquip EM903176 Conn Rod Bearing is a genuine OEM component designed for Mayco C30HD series concrete pumps, including the C30HD, C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDZ, and C30HDGA. Sourced directly through Multiquip's OEM supply chain, this bearing is engineered to the exact tolerances required by the C30HD pump family. Choosing a genuine OEM part ensures the connecting rod assembly operates within the clearance specifications the pump was built around, protecting both the crankshaft and the rod itself from premature wear.

Key Features

• OEM Precision Tolerancing — Manufactured to the exact clearance and load specifications of the C30HD crankshaft assembly, ensuring the connecting rod seats and rotates correctly without play or binding.
• Drop-In Replacement — Matches the original bearing dimensions for direct installation into the connecting rod housing with no machining or adaptation required on the rod or journal.
• Broad C30HD Series Coverage — Confirmed fitment across C30HD, C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDZ, and C30HDGA concrete pump models.
• Protects the Crankshaft Journal — A correctly spec'd bearing maintains the oil film barrier between the rod and journal, preventing metal-to-metal contact that leads to crankshaft scoring and costly bottom-end repairs.
• Genuine OEM Part — Supplied as an authentic Multiquip replacement, giving you the same bearing the pump left the factory with and full confidence in the part's dimensional accuracy.

The connecting rod bearing sits between the connecting rod and the crankshaft journal inside the pump's engine or drive unit, allowing the rod to rotate smoothly around the crank as it converts rotary motion into the reciprocating stroke that drives the pump. It relies on a thin film of pressurized oil to prevent direct metal contact, so correct clearance is critical — too loose and oil pressure drops, too tight and the bearing overheats and seizes. When a conn rod bearing wears out or fails, the result is a knocking noise, rapid loss of oil pressure, and ultimately a seized or damaged crankshaft that can put the entire pump out of service.

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.