Multiquip 37449 Piston Backup Ring

The Multiquip 37449 Piston Backup Ring is a genuine OEM component designed for PS706, SP706, and CS706 series pavement saws. As a direct OEM replacement, this part meets the original design specifications for the water system or blade-depth mechanism it supports, ensuring correct function without adaptation. Confirmed fitment includes PS706016, PS706020, PS706026, PS706030, PS706036, SP706016, SP706020, SP706026, SP706030, SP706036, CS706016, CS706020, CS706026, CS706030, and CS706036. When it's time to restore proper sealing and piston function, part number 37449 is the correct replacement to reach for.

Key Features

• Genuine OEM Sealing Integrity — Manufactured to the original material grade and compression profile, maintaining the pressure retention the piston assembly depends on.
• Drop-In Installation — Engineered to the same dimensional spec as the original, so it seats correctly within the piston bore without reworking surrounding components.
• Broad Saw Series Compatibility — Fits PS706, SP706, and CS706 pavement saw models, covering a wide range of Multiquip flat and pavement cutting equipment.
• Prevents Pressure Loss and Bypass — A worn or damaged backup ring allows fluid or pressure to bypass the piston, degrading control response. Replacing part 37449 restores full piston travel and consistent pressure delivery.
• Hydraulic System Safety — In pressure-bearing assemblies, a failed backup ring can cause unpredictable actuator behavior. Using the correct OEM ring keeps the hydraulic circuit operating within its intended pressure range.

A piston backup ring is a support seal that sits behind the primary sealing element in a piston assembly, preventing the softer primary seal from extruding into the clearance gap under pressure. Without it, high operating pressures force the primary seal to deform, causing premature seal failure, pressure bypass, and loss of controlled movement in the system. Replacing the backup ring at the first sign of fluid bypass or pressure drop is essential to restoring consistent, controlled operation in the saw's hydraulic or water-feed circuit.

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.