The Wacker Neuson Tappet is a genuine OEM component designed for the APT4S and APT4T pump series, including standard and cold weather variants. Sourced directly from Wacker Neuson, this tappet meets the same specifications as the part originally installed at the factory, ensuring a correct, trouble-free installation. It covers a broad range of APT4S and APT4T configurations — surge brake, electric brake, skid-mounted, and cold weather models — so you can order with confidence knowing this is the right part for your machine.
Key Features
- Genuine OEM Dimensional Accuracy — Manufactured to the exact profile and hardness spec of the original tappet, ensuring correct valve actuation timing and consistent lift across the pump's operating cycle.
- Drop-In Installation — Matches the original mounting position and contact geometry, fitting directly into the valve train without adjustment or rework.
- Broad APT Series Coverage — Compatible with APT4S and APT4T pump models across surge brake, electric brake, skid, and cold weather configurations.
- Protects Valve Train Longevity — A worn or out-of-spec tappet causes uneven valve lift and accelerated cam wear; replacing it promptly restores smooth, consistent pump operation.
- Verified Part Number — Sold under Wacker Neuson part number 5200020001, cross-referenced against all listed APT4S and APT4T model and machine numbers for fitment accuracy.
A tappet is a small but critical component in the valve train, acting as the interface between the camshaft lobe and the valve stem. As the camshaft rotates, the tappet translates that rotational motion into the precise up-and-down movement needed to open and close the engine's valves at the right moment. When a tappet wears down or develops surface damage, it disrupts valve timing and lift, which can lead to rough running, loss of power, and accelerated wear on surrounding valve train components — making timely replacement essential to keeping the pump performing at its best.
Part Details
| Part Number | 5200020001 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Tappet |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
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.
