The Multiquip EM518555 Crank Arm Nut Lock is a genuine OEM component designed for LS600P and LS300P hydraulic-driven concrete pumps. Sourced directly from Multiquip, this part meets the exact specifications required to maintain proper fastener retention on the crank arm assembly. It is a direct-fit replacement, confirmed for LS600P and LS300P models, allowing for straightforward installation without guesswork. Keeping this small but critical locking component in good condition is essential to the safe and consistent operation of the pumping mechanism.
Key Features
- Genuine OEM Fastener Integrity — Manufactured to Multiquip's exact tolerances, ensuring the nut lock engages and holds with the same retention force as the original hardware.
- Direct-Fit Installation — Engineered to thread and seat precisely on the crank arm assembly, replacing the original component without modification to mounting points or surrounding hardware.
- Confirmed Fitment for LS-Series Concrete Pumps — Verified compatibility with LS600P and LS300P hydraulic-driven concrete pump models.
- Prevents Fastener Backout Under Load — The crank arm operates under continuous cyclic stress; a properly functioning nut lock prevents the fastening hardware from loosening during pumping cycles, preserving drivetrain alignment.
- Safety-Critical Retention Component — Fastener loosening on a concrete pump crank arm can lead to mechanical failure mid-operation; using a genuine OEM nut lock ensures the locking mechanism performs as designed under working loads.
The crank arm nut lock is a fastener retention device that prevents the nut securing the crank arm from backing out during operation. On hydraulic concrete pumps like the LS600P and LS300P, the crank arm converts hydraulic motion into the reciprocating action that drives the pumping cylinders — meaning it is subject to constant vibration and cyclic loading. If the nut lock fails or is missing, the crank arm nut can loosen progressively, leading to play in the assembly, accelerated wear on surrounding components, and potential mechanical failure of the pump drive system.
Part Details
| Part Number | EM518555 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Crank Arm Nut Lock |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | LS600P |
| Mayco Pumps | LS300P |
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.
