Wacker Neuson 5002004794 Ring Backup 25 X 35 X 2 D988

The Wacker Neuson Ring Backup 25 X 35 X 2 D988 is a genuine OEM component designed for the AR 41, AR 42, AR 43, AR 44, AR 51, AR 52, AR 53, AR 54, AR 61, AR 62, AR 63, and AR 64 series external vibrators, as well as the AP1840e, AP1840we, AP1850e, and AP1850we vibratory plates. As a factory-sourced part, this backup ring is manufactured to the exact dimensional and material tolerances required by Wacker Neuson for use in these machines. Correct fitment of this ring helps maintain hydraulic or fluid sealing integrity within the vibrator assembly, protecting against internal leakage and premature wear. Verify your model number against the fitment list before ordering to ensure a direct match.

Key Features

• Genuine OEM Dimensional Accuracy — Manufactured to exact 25 x 35 x 2 mm tolerances, ensuring the ring seats correctly and delivers consistent sealing performance within the vibrator housing.
• Direct Drop-In Replacement — Matches the original installation profile of the D988-spec backup ring, slotting into place without reworking the seal groove or adjacent components.
• Broad Series Compatibility — Covers an extensive range of AR 41 through AR 64 external vibrators across multiple voltage configurations, plus AP1840 and AP1850 vibratory plates.
• Protects Primary Seals — Backup rings support the primary seal under pressure, preventing extrusion and extending the service life of the entire sealing assembly.
• Sourced Direct from Wacker Neuson — Carries the correct OEM part number 5002004794, so you can cross-reference with your parts manual and order with confidence.

A backup ring is a precision-dimensioned ring installed behind a primary seal to prevent that seal from being pushed or extruded into the clearance gap under operating pressure. In external vibrators and compaction equipment, where internal components operate under sustained mechanical and hydraulic stress, a failed or missing backup ring can cause the primary seal to deform, leading to fluid leakage, loss of operating pressure, and accelerated wear on surrounding components. Replacing this ring at the correct service interval — or any time primary seal replacement is performed — is a straightforward step that keeps the sealing system functioning as intended.

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.