The Multiquip EM409 Adaptor 3903-16-16 is a genuine OEM hydraulic adaptor designed for the LS-series hydraulic-driven concrete pumps, including LS600, LS500, LS400, LS60TD, LS50TD, LS40TD, and LS40D models. Sourced directly from Multiquip, this adaptor meets the exact specifications required for proper hydraulic circuit integration in these machines. Correct fitment is critical in high-pressure concrete pump hydraulic systems, and using the genuine EM409 ensures the connection performs as the machine was engineered to deliver. DHS Equipment stocks this part to keep your Mayco LS-series pump operating without compromise.
Key Features
- Genuine OEM Hydraulic Integrity — Manufactured to the precise thread form, port sizing, and pressure rating required by the LS-series hydraulic circuit — no guesswork on compatibility.
- Direct-Fit Hydraulic Connection — The EM409 seats and seals correctly within the existing hydraulic plumbing of supported LS-series pumps, requiring no reworking of adjacent fittings or lines.
- Broad LS-Series Coverage — Confirmed fitment across LS600, LS500, LS400, LS60TD, LS50TD, LS40TD, and LS40D hydraulic-driven concrete pump models.
- Leak-Free Hydraulic Performance — A correctly installed adaptor maintains hydraulic pressure integrity; a worn, cross-threaded, or incorrect adaptor can cause pressure loss, fluid leaks, and pump output inconsistency.
- Critical Fuel and Fluid System Safety — In high-pressure hydraulic concrete pump systems, a properly rated OEM adaptor prevents fitting failures that could result in uncontrolled hydraulic fluid release under pressure.
A hydraulic adaptor serves as a threaded connector within the hydraulic plumbing system, allowing two hydraulic lines, ports, or components of differing thread sizes or configurations to mate securely. In a hydraulic-driven concrete pump like the LS-series, the hydraulic circuit powers the pumping mechanism, and every fitting in that circuit must maintain a leak-free seal under sustained operating pressure. When an adaptor fails — through thread wear, cracking, or incorrect sizing — the hydraulic system loses pressure, which directly reduces the pump's ability to move concrete efficiently or at all.
Have questions about fitment or need help confirming the right part for your machine? Contact the DHS Equipment parts team for assistance.
Part Details
| Part Number | EM409 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Adaptor 3903-16-16 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | LS600 |
| Mayco Pumps | LS50TD |
| Mayco Pumps | LS40TD |
| Mayco Pumps | LS500 |
| Mayco Pumps | LS400 |
| Mayco Pumps | LS40D |
| Mayco Pumps | LS60TD |
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.
