Overview
The ZF 4616.123.009 PLANETARY DRIVE is a critical torque-multiplying assembly engineered specifically for the WG 65 Series transmission. This OEM genuine part, identified by SKU 4616.123.009, sits within the main gear train and is responsible for distributing rotational force across the planetary gears. It directly interfaces with the TRANSMISSION HOUSING (4616101059) to ensure precise alignment and load distribution. Without this planetary drive, the transmission cannot achieve its rated gear ratios, making it essential for heavy-duty industrial applications where consistent power delivery is non-negotiable.
Symptoms of Failure
When the ZF 4616.123.009 planetary drive begins to degrade, operators typically notice three distinct failure modes. First, intermittent gear slipping under load becomes apparent during uphill climbs or heavy hauling, often accompanied by a grinding noise. Second, metal particles in the transmission fluid indicate internal wear, which can be detected during routine oil sampling. Third, erratic shift timing occurs as the planetary gears lose their precise engagement, causing delayed or harsh gear changes. These symptoms often worsen when the assembly is not properly secured with the correct HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) fasteners.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.123.009 |
| Gear Type | Planetary (sun, planet, ring gear set) |
| Outer Diameter | 180 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (estimated) |
| OEM Reference | ZF 4616.123.009 |
| Torque Capacity | Up to 650 Nm (estimated) |
Compatibility
This planetary drive is designed for the ZF WG 65 Series, which includes models such as the WG65, WG80, and WG100 transmissions. It is also compatible with select WG120 and WG150 variants that share the same planetary carrier architecture. The part requires precise alignment with the HEXAGON SCREW (0636016015) for secure mounting to the output shaft. Always verify your transmission model number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses and supports planetary drive assembly |
| 0636011038 | HEXAGON SCREW | Secures planetary carrier to housing |
| 0636011118 | HEXAGON SCREW | Fastens ring gear to transmission case |
| 0636016015 | HEXAGON SCREW | Mounts output flange to planetary drive |
| 0631306085 | CYLINDRICAL PIN | Aligns planetary gear set during assembly |
| 0634313118 | O-RING | Seals planetary drive against fluid leakage |
| 0636304019 | SCREW PLUG | Closes oil passages in planetary carrier |
| 0634801152 | SEALING RING | Prevents oil seepage at shaft interfaces |
| 0732611049 | FILTER INSERT | Traps debris from planetary gear wear |
| 0634303718 | O-RING | Secondary seal for high-pressure zones |
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