Multiquip EM98120 Flow Direction Switch Assembly

The Multiquip EM98120 Flow Direction Switch Assembly is a genuine OEM component designed for LS-series hydraulic-driven concrete pumps, including the LS300, LS400, LS500, LS600, LS60TD, LS40D, LS40TD, LS50TD, LS600P, LS300P, and LS300G. As a factory-sourced replacement, this assembly meets the original engineering specifications for your Mayco concrete pump, ensuring correct hydraulic sequencing and reliable switching action. If your pump is showing erratic flow behavior, reversed discharge direction, or is failing to cycle properly, this switch assembly is a primary component to inspect and replace. DHS Equipment supplies this part direct, so you can get your pump back on pour without extended delays.

Key Features

• Genuine OEM Switching Precision: — Factory-sourced assembly maintains the exact hydraulic signal thresholds required to trigger correct directional changes in the pump cycle — critical for consistent concrete output.
• Direct-Fit Replacement: — Engineered to install into the existing hydraulic circuit of LS-series Mayco pumps using the original mounting points and port connections.
• Broad LS-Series Compatibility: — Confirmed fitment across LS300, LS400, LS500, LS600, LS40D, LS40TD, LS50TD, LS60TD, LS300G, LS300P, and LS600P concrete pump models.
• Cycle Integrity: — A functioning flow direction switch keeps the pump cycling in the correct sequence; a failed switch causes misfires, loss of output pressure, or complete pump shutdown during a pour.
• Hydraulic System Safety: — Correct directional switching prevents uncontrolled hydraulic pressure buildup, protecting downstream components and operators from hazardous pressure events.

The flow direction switch assembly is the hydraulic control component responsible for signaling when the concrete pump's pistons must reverse direction during each stroke cycle. It monitors hydraulic pressure or cylinder position and sends the command that redirects fluid flow, allowing the pump to alternate strokes and deliver a continuous, consistent output of concrete through the boom or hose. When this assembly wears or fails, the pump loses its ability to time reversals correctly — resulting in surging output, incomplete strokes, or a full pump stoppage that can leave concrete setting in the line.

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.