Overview
The ZF 4616.323.038 SUN GEAR is a critical internal component engineered specifically for the WG 65 series transmission. This genuine OEM part functions as the central driving gear within the planetary gear set, transferring torque directly from the input shaft to the planetary pinions. Positioned deep inside the main gear train, the sun gear meshes with multiple planetary gears to facilitate smooth ratio changes under heavy load. The SKU 4616.323.038 is precision-machined to exact ZF tolerances, ensuring proper alignment with the TRANSMISSION HOUSING and supporting shafts. Without this sun gear, the WG65 gearbox cannot achieve its rated torque capacity or shift reliably.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn sun gear produces a high-pitched metallic whine, especially under acceleration or when shifting between forward and reverse. This is a classic sign of tooth surface fatigue or pitting.
- Intermittent gear slipping under load: When the sun gear teeth lose their hardened profile, the planetary pinions can skip, causing sudden loss of drive power. This symptom often worsens as transmission oil temperature rises.
- Metallic debris in transmission fluid: Flakes or small chips found during an oil change indicate advanced wear of the sun gear. This debris can quickly damage the HEXAGON SCREW fasteners and other rotating components.
- Hard shifting or delayed engagement: A damaged sun gear disrupts the planetary gear set’s balance, leading to harsh clutch engagement and erratic shift timing.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.323.038 |
| OEM Reference | ZF 4616.323.038 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outside Diameter | 98.5 mm |
| Internal Spline Diameter | 42.0 mm |
| Tooth Count | 24 teeth (standard module 3.5) |
| Hardness | 58-62 HRC |
| Surface Finish | Ground and polished |
Compatibility
This sun gear is a direct fit for the ZF WG 65 series transmission family. Based on its design and spline dimensions, it is also compatible with the following ZF models that share the same planetary gear architecture: WG65, WG80, WG100, WG120, WG150, WG180, and WG200. Always verify the internal spline count and tooth profile against your existing sun gear before installation. The part mounts securely using HEXAGON SCREW fasteners and requires proper torque to the HEXAGON SCREW specifications listed in the service manual.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 0636011038 | HEXAGON SCREW | Secures housing and cover plates |
| 0636011118 | HEXAGON SCREW | Fastens planetary carrier components |
| 0636016015 | HEXAGON SCREW | Mounts sun gear to shaft hub |
| 0631306085 | CYLINDRICAL PIN | Aligns gear set components during assembly |
| 0634313118 | O-RING | Seals oil passages around the sun gear shaft |
| 0636304019 | SCREW PLUG | Closes inspection ports in the housing |
| 0634801152 | SEALING RING | Prevents fluid leaks at threaded connections |
| 0732611049 | FILTER INSERT | Captures debris from gear wear |
| 0634303718 | O-RING | Seals the filter housing interface |
ZF 4616.323.038 SUN GEAR – Gear RFQ Support
PartsZF helps B2B buyers source ZF 4616.323.038 SUN GEAR with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This gear page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4616.323.038 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: INTERM.GEARBOX
- Illustration section: PLANETARY DRIVE
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4616.323.038 |
|---|---|
| Normalized SKU | 4616323038 |
| Part name | SUN GEAR |
| Product category | gear |
| Cross-reference support | Available for RFQ review |
| Weight | 7.99 |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
Related Parts
- ZF 4646.302.128 HELICAL GEAR
- ZF 4143.316.088 PINION
- ZF 4657.302.007 INPUT GEAR
- ZF 4657.354.044 OUTPUT GEAR
- ZF 4644.306.326 GEAR SHIFT HOUSING
