Wacker Neuson 5100012501 Filler Cap

The Wacker Neuson is a genuine OEM Filler Cap designed for the RD40-130, RD45-140, and RC110 series tandem rollers. As a factory-original component, it is built to the same specifications as the cap installed at the production line, ensuring a correct, secure seal across all covered configurations — including standard, cab, open-ROPS, DPF, and US-market variants. This cap fits a wide range of RD40-130 and RD45-140 model variants as well as RC110 ROPS and CAB machines, making it the go-to solution for fleet operators running multiple roller configurations. Keep part number on hand as a service spare to avoid unnecessary delays during routine maintenance.

Key Features

• OEM Sealing Integrity — Manufactured to original tolerances for a positive, leak-free closure that aftermarket alternatives may not consistently achieve on Wacker Neuson roller reservoirs.
• Direct Drop-In Replacement — Threads directly onto the original filler neck with no rework or adaptation needed, restoring the reservoir to a sealed, service-ready condition.
• Broad Model Coverage — Fits RD40-130 and RD45-140 series in standard, cab, open-ROPS, DPF, and US-spec configurations, plus RC110 ROPS and CAB variants — one part number covers the full roller lineup.
• Contamination Defense — A properly seating filler cap keeps dirt, debris, and moisture out of the fluid reservoir, protecting internal components from accelerated wear caused by contaminated fluid.
• Fuel and Fluid System Safety — A failed or missing filler cap on a roller reservoir is a direct spillage and fire risk on the worksite; replacing it promptly with the correct OEM part restores safe operating conditions.

A filler cap seals the reservoir opening used during fluid fill and top-up procedures, maintaining an enclosed system that prevents contaminants from entering and fluid from escaping. On compaction equipment like tandem rollers, an intact, correctly fitted cap is essential to keeping hydraulic or fuel fluid clean and at the right operating level — dirty or low fluid leads directly to component wear and potential system failure. When a filler cap cracks, strips, or goes missing, the reservoir is immediately exposed to the environment, making prompt replacement critical to continued safe operation.

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.