Multiquip EM98004SK Seal Kit ST45

The Multiquip EM98004SK Seal Kit ST45 is a genuine OEM seal kit designed for the ST45 swing-tube concrete pump. As an authentic Multiquip replacement, this kit is manufactured to the same specifications as the original components, ensuring a proper, consistent fit within the ST45 pump assembly. Sourced directly through authorized Multiquip supply channels, the part is the correct service kit when restoring hydraulic and fluid sealing integrity on ST45 equipment.

Key Features

• OEM-Grade Seal Materials — Crafted from the same elastomer and composite compounds as the original seals, delivering the compression retention and chemical resistance a concrete pump demands.
• Complete Kit Configuration — Includes all seals required for the service interval, so you have every component on hand before the job starts rather than making multiple orders.
• Direct ST45 Fitment — Engineered specifically for the ST45 swing-tube concrete pump, the seals seat correctly in factory locations without adaptation or modification to housings or bores.
• Sustained Pumping Pressure — Properly seated seals maintain hydraulic pressure throughout the stroke cycle, keeping output volume consistent and preventing the loss of pumping efficiency that worn seals cause.
• Leak Prevention at the Source — Failed or hardened seals in a concrete pump allow slurry and hydraulic fluid to bypass their intended paths, accelerating internal wear; replacing them with EM98004SK addresses the root cause directly.

Seals in a concrete pump serve as the primary barrier between pressurized hydraulic fluid, concrete slurry, and the mechanical components that drive the pumping action. In a swing-tube design like the ST45, the seals must withstand continuous cycling, abrasive material contact, and elevated pressure without deforming or cracking. When seals begin to fail, you will typically see pressure drop, increased cycle time, external leaking, or contamination of hydraulic fluid — all of which reduce output and can lead to more costly internal damage if left unaddressed. Replacing the full seal set with the part restores the pump to proper operating condition and extends the service life of surrounding components.

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.