Multiquip 50504200 Alternator 3M40L ST-30

The Multiquip 50504200 Alternator 3M40L ST-30 is a genuine OEM alternator designed for the ST30 swing-tube concrete pump. As a direct Multiquip OEM component, it is built to the exact electrical output and mounting specifications required by the ST30, ensuring proper charging system function without adaptation. DHS Equipment supplies this part direct from Multiquip's authorized parts network, so you can be confident you're getting the correct unit for your machine.

Key Features

• Correct Electrical Output for Concrete Pump Duty — Matched to the ST30's charging system demands, delivering the voltage and amperage the machine's electrical circuit is engineered to receive.
• Genuine OEM Component — Sourced directly from Multiquip, this alternator meets the same build standard as the unit that left the factory with your ST30.
• Direct Fitment for ST30 — Engineered specifically for ST30 swing-tube concrete pumps, with correct bracket geometry and connector interface for a straightforward installation.
• Sustained Charging System Performance — A properly functioning alternator keeps the battery charged and the engine control system powered under continuous pumping cycles; a failing unit can cause unexpected shutdowns mid-pour.
• Electrical System Safety — Using the correct OEM-spec alternator prevents over- or under-charging conditions that can damage batteries, control boards, and wiring harnesses on the ST30.

The alternator is the engine-driven generator responsible for recharging the battery and supplying electrical power to the machine's ignition, controls, and ancillary systems while the engine is running. On a concrete pump like the ST30, where continuous operation is critical during active pours, a healthy charging system is essential — a worn or failed alternator will drain the battery under load, leading to loss of engine control power and unplanned stops. Replacing a degraded alternator with the correct OEM unit restores stable voltage to the entire electrical system and protects downstream components from the stress of an irregular charge cycle.

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.