The Wacker Neuson 5100035981 is a genuine OEM Back Pressure Valve designed for the BS50-2plus, BS60-2plus, and BS70-2plus series gasoline vibratory rammers. As a direct factory replacement, this part matches the original specification, ensuring the fuel system operates exactly as engineered. Compatible across multiple configurations including US, ha US, CN, 6-inch, and 11-inch variants within the BS-2plus rammer family, the 5100035981 covers a broad range of machines from a single part number. When your rammer's back pressure valve wears or fails, replacing it with the correct genuine OEM component keeps the engine's fuel delivery system functioning as intended.
Key Features
- Genuine OEM Fuel System Integrity — Manufactured to Wacker Neuson's original specification, ensuring correct crankcase pressure regulation without the guesswork of aftermarket alternatives.
- Broad BS-2plus Series Coverage — A single part number serves the BS50-2plus, BS60-2plus, and BS70-2plus rammer families across US, ha US, CN, 6-inch, and 11-inch configurations.
- Direct Drop-In Replacement — Engineered to the same dimensions and connection points as the original, allowing straightforward installation without additional modification.
- Protects Engine Performance — A properly functioning back pressure valve maintains the correct pressure differential in the fuel circuit; a failed unit can cause hard starting, erratic running, or fuel delivery loss on the rammer.
- Fuel System Safety — The back pressure valve is a critical fuel circuit component; using a genuine OEM part ensures it meets the original pressure tolerance ratings, supporting safe operation in demanding compaction conditions.
The back pressure valve regulates pressure within the fuel delivery circuit of the rammer's two-stroke engine, preventing fuel from flowing in the wrong direction and ensuring a consistent supply reaches the carburetor. On a vibratory rammer like the BS-2plus series, which operates under continuous high-frequency impact loads, this valve is subjected to repeated stress cycles and can harden, crack, or lose its sealing ability over time. When it fails, operators typically notice difficult starting, inconsistent engine power, or fuel starvation under load — all of which directly affect the rammer's ability to compact cohesive soils and trench backfill effectively.
Part Details
| Part Number | 5100035981 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Back Pressure Valve |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| BS50-2plus 11in US | BS50-2plus 11in US | 5100030594 |
| BS50-2plus 11in ha US | BS50-2plus 11in ha US | 5100030595 |
| BS50-2plus 11in | BS50-2plus 11in | 5100030596 |
| BS50-2plus 6in (24mm) | BS50-2plus 6in (24mm) | 5100030597 |
| BS60-2plus 11in US | BS60-2plus 11in US | 5100030602 |
| BS60-2plus 11in ha US | BS60-2plus 11in ha US | 5100030603 |
| BS60-2plus 11in | BS60-2plus 11in | 5100030604 |
| BS60-2plus 11in CN | BS60-2plus 11in CN | 5100039660 |
| BS70-2plus 11in US | BS70-2plus 11in US | 5100030608 |
| BS70-2plus 11in | BS70-2plus 11in | 5100030609 |
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.
