Overview
The ZF 4616.123.034 PLANETARY DRIVE is a critical torque-multiplying assembly engineered for the WG 65 Series transmission. This OEM genuine part, identified by SKU 4616.123.034, sits directly within the gear train to distribute load across multiple pinions, enabling smooth power delivery under heavy industrial loads. It interfaces directly with the 4616105413: OUTPUT and the 4616101117: TRANSMISSION HOUSING, forming the core of the final drive reduction stage. Precision-ground gears and hardened carrier components ensure minimal backlash and maximum durability in demanding construction and material handling applications.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn planetary gears or damaged bearings within the 4616.123.034 assembly produce a distinct high-pitched whine under load, often mistaken for transmission pump noise.
- Intermittent gear slipping under heavy torque: When the planetary carrier or sun gear wears, the drive loses positive engagement, causing sudden loss of power to the 4616203017: OUTPUT FLANGE during acceleration or hill climbs.
- Metallic debris in transmission fluid: Flaking or spalling on the planetary gears generates fine steel particles that contaminate the oil, often visible during drain intervals or filter inspections.
- Vibration at specific RPM ranges: Uneven wear on the planetary pinions creates harmonic vibrations that resonate through the TRANSMISSION HOUSING, particularly noticeable at low speeds.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.123.034 |
| Type | Planetary Drive Assembly |
| Material | Case-hardened alloy steel (carrier & gears) |
| Weight | Approx. 8.2 kg (18.1 lbs) |
| Outer Diameter | 195 mm |
| Overall Length | 112 mm |
| Number of Planets | 4 |
| OEM Reference | ZF 4616.123.034 |
| Fastener Torque (screws) | 85 Nm (for 0636011038: HEXAGON SCREW) |
Compatibility
This planetary drive is specifically designed for the ZF WG 65 Series transmission family. It is a direct replacement for units used in WG65, WG80, WG100, WG120, WG150, WG180, and WG200 models that share the same planetary carrier geometry. Always verify the spline count and sun gear tooth profile before installation. The assembly mounts directly to the OUTPUT shaft and is secured using 0636011038: HEXAGON SCREW fasteners. It is not compatible with older WG 30 or WG 40 series without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from planetary drive to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101117 | TRANSMISSION HOUSING | Encloses planetary drive and supports bearings |
| 0636011038 | HEXAGON SCREW | Secures planetary carrier to output shaft |
| 0636016015 | HEXAGON SCREW | Fastens housing cover to transmission case |
| 0631306085 | CYLINDRICAL PIN | Aligns planetary carrier during assembly |
| 0634313118 | O-RING | Seals planetary drive cavity against oil leaks |
| 0732611049 | FILTER INSERT | Captures debris from planetary gear wear |
| 0634303718 | O-RING | Seals output flange connection point |
| 0636610082 | STUD | Positions housing components during torque sequence |
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