Overview
The ZF 4616.323.005 PLANETARY AXLE is a critical load-bearing component engineered specifically for the WG 65 Series transmission. This OEM genuine part serves as the central rotating shaft within the planetary gear set, transmitting torque from the sun gear to the planet carrier while managing significant radial and axial forces. The SKU 4616.323.005 ensures precise alignment of planetary gears, enabling smooth power flow during high-load operations in construction, mining, and heavy-duty industrial vehicles. Without this axle, the planetary assembly cannot maintain gear mesh integrity, leading to immediate drivetrain inefficiency.
Symptoms of Failure
- Grinding or whining noise during gear engagement — Worn bearing surfaces on the planetary axle cause uneven gear contact, producing audible metallic sounds under load.
- Intermittent gear slipping under heavy torque — A fatigued axle allows planetary gears to shift out of alignment, resulting in momentary loss of drive power.
- Metallic debris in transmission fluid — Surface spalling or cracking of the axle generates fine steel particles that contaminate the oil, often visible during filter inspections.
- Vibration through the chassis during acceleration — Axle runout exceeding tolerances creates cyclic imbalances that transmit through the transmission housing.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.323.005 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 245 mm |
| Journal Diameter | 38 mm |
| Weight | 2.85 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 4616.323.005 |
Compatibility
This planetary axle is designed for the ZF WG 65 Series transmission family. It is also compatible with the following ZF models that share the same planetary gear architecture: WG180, WG200, WG250, and WG300. Always verify your transmission serial number before installation, as minor design revisions exist between early and late production units.
During installation, the planetary axle interfaces directly with the TRANSMISSION HOUSING (4616101059), which provides the structural enclosure for the gear set. Secure mounting requires three specific fasteners: the HEXAGON SCREW (0636011038) for the carrier retention plate, the HEXAGON SCREW (0636011118) for the sun gear lock, and the HEXAGON SCREW (0636016015) for the output flange. Proper torque sequencing of these bolts prevents axial play that could damage the axle.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses planetary gear assembly |
| 0636011038 | HEXAGON SCREW | Secures carrier retention plate |
| 0636011118 | HEXAGON SCREW | Locks sun gear to axle |
| 0636016015 | HEXAGON SCREW | Fastens output flange |
| 0631306085 | CYLINDRICAL PIN | Aligns planet carrier to axle |
| 0634313118 | O-RING | Seals axle bore in housing |
| 0636304019 | SCREW PLUG | Closes lubrication port |
| 0634801152 | SEALING RING | Prevents oil leakage at axle end |
| 0732611049 | FILTER INSERT | Traps debris from axle wear |
| 0634303718 | O-RING | Seals filter housing interface |
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