Multiquip EM517674 Pump Piston LS400 - OEM Replacement Part

The piston pump assembly is the heart of the concrete pumping system, responsible for creating the high-pressure hydraulic force needed to move concrete through the delivery line. This component works in conjunction with hydraulic cylinders and the shuttle tube system to produce alternating pumping strokes that push concrete from the hopper through the discharge assembly.

In the LS400/LS500 concrete pump design, the piston operates within the concrete cylinder assembly as part of a dual-piston configuration (Cylinder A and Cylinder B). The system uses hydraulic pressure to drive the pistons in alternating cycles, with proximity switches coordinating the shuttle tube motion to ensure continuous concrete flow. The piston cup seals against the cylinder walls to maintain pressure integrity during pumping operations, while hydraulic oil pressure from the main pump drives the mechanical motion.

This piston pump assembly is engineered to handle the demanding high-pressure environment of trailer-mounted concrete pumping, where system pressures can reach 4400 PSI at the relief valve. Regular inspection of piston cup wear and hydraulic seal condition is critical for maintaining optimal pumping performance and preventing concrete blowback.

Compatible with:

• Multiquip LS400 Concrete Pump
• Multiquip LS500 Concrete Pump

Genuine Multiquip OEM part, sold by an authorized dealer.