Overview
The ZF 4646.154.407 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG 251 Series transmission. This unit serves as the primary power interface, transferring engine torque to auxiliary hydraulic systems such as dump bodies, winches, or concrete mixers. Mounted directly to the transmission housing, the PTO engages via a sliding gear mechanism that meshes with the transmission’s countershaft. The SKU 4646.154.407 is precision-machined to ZF’s exacting tolerances, ensuring seamless integration with the TRANSMISSION HOUSING and the HOUSING assembly. This genuine part guarantees reliable power take-off performance under continuous heavy-duty cycles.
Symptoms of Failure
When the ZF 4646.154.407 POWER TAKE-OFF begins to degrade, operators will notice distinct warning signs. Oil leaks around the PTO mounting flange are the most common early indicator, often caused by a worn gasket or cracked housing. Gear slipping or grinding during engagement occurs when the internal shift fork or sliding gear teeth become worn, leading to incomplete mesh. Unusual vibration or whining noise from the PTO unit typically signals bearing failure or misalignment. Intermittent power loss to auxiliary equipment—such as a hydraulic pump failing to reach full RPM—points to internal gear wear or a damaged shift mechanism. Addressing these symptoms promptly prevents cascading damage to the COVER and CAP SCREW assemblies.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.154.407 |
| Product Type | Power Take-Off (PTO) |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight | 12.4 kg (27.3 lbs) |
| Overall Length | 285 mm |
| Mounting Flange Diameter | 180 mm |
| Output Shaft Spline | 1 1/4″ – 10 spline (SAE B) |
| Max Torque Capacity | 650 Nm |
| OEM Reference | ZF 4646.154.407 |
| Seal Type | Viton double-lip seal |
Compatibility
This ZF 4646.154.407 POWER TAKE-OFF is designed for the WG 251 Series transmission family. It is also compatible with the following ZF models when used with the appropriate adapter kits: WG180, WG200, WG211, and WG250. The PTO mounts to the left-side opening of the transmission housing and interfaces directly with the countershaft gear. Always verify the output shaft orientation and spline configuration against your specific transmission model. For proper installation, ensure the TRANSMISSION HOUSING and HOUSING are free of debris and that the CAP SCREW torque values meet ZF specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301201 | HOUSING | Secondary housing for PTO mounting |
| 4646301166 | COVER | Seals the PTO opening, prevents contamination |
| 0636101051 | CAP SCREW | Fastener for housing and cover attachment |
| 4646201018 | COVER SHEET | Thin gasket for sealing surfaces |
| 4646301277 | SCREEN SHEET | Filter screen for oil return circuit |
| 4646201019 | COVER SHEET | Secondary sealing gasket |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment pin for precise assembly |
| 0636010216 | HEXAGON SCREW | Bolts for securing PTO to housing |
