Overview
The ZF 4108.302.190 PLANETARY GEAR is a critical rotating assembly within the WG100, WG130, and WG131 transmission series. This genuine OEM component functions as the primary torque-splitting element inside the planetary gearset, directly transferring engine power through the sun gear and planet carriers to the output shaft. As a precision-ground gear, it maintains exact tooth geometry to ensure smooth engagement under heavy load. The SKU 4108.302.190 is engineered to match ZF’s original factory tolerances, making it a direct replacement for worn or damaged units in commercial vehicle drivelines.
Symptoms of Failure
- Transmission gear slipping under load: When the planetary gear teeth wear or chip, the transmission may momentarily lose torque transfer during acceleration, especially on inclines.
- Metallic grinding or whining noise from the transmission housing: A failing 4108.302.190 gear often produces a distinct high-pitched whine or grinding sound that increases with engine RPM.
- Delayed or harsh shifting between forward gears: Worn planetary gears can cause erratic shift timing, as the transmission control unit detects irregular speed signals from the gearset.
- Visible metal debris in the transmission fluid: Flakes or fine metallic particles found during an oil change indicate advanced gear wear, often originating from the planetary gear teeth.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.302.190 |
| Gear Type | Planetary (sun/planet carrier assembly) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | ~180 mm |
| Overall Length | ~95 mm |
| Weight | ~4.2 kg |
| OEM Reference | ZF 4108.302.190 |
| Tooth Count (Sun) | 24 |
| Tooth Count (Planet) | 18 (3 planets) |
| Hardness | 58–62 HRC |
Compatibility
This genuine ZF planetary gear is specifically designed for the WG100, WG130, and WG131 transmission models. It also fits select variants of the WG180 and WG200 series when used with the correct carrier assembly. Always verify your transmission’s serial number against the OEM parts catalog before ordering. For complete assembly, this gear works in conjunction with the 4108101120 HOUSING and the 4108201307 HOUSING to enclose the gearset. Proper lubrication is ensured by the 0501215601 OIL LEVEL GAGE, while the 0501325471 SEALING RING prevents fluid leaks at the housing interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101120 | HOUSING | Encloses the planetary gearset and supports bearing alignment |
| 4108201307 | HOUSING | Secondary housing for output shaft support |
| 0501215601 | OIL LEVEL GAGE | Monitors transmission fluid level for proper lubrication |
| 0501325471 | SEALING RING | Prevents oil leaks between housing joints |
| 0730365280 | TYPE PLATE | Identification label for transmission model and serial number |
| 4108301450 | INPUT SHAFT | Transfers engine torque to the planetary gearset |
| 0750116277 | BALL BEARING | Supports rotating shafts within the gear train |
| 0630502039 | RETAINING RING | Secures bearings and gears on the shaft |
| 0630531064 | RETAINING RING | External snap ring for planetary carrier retention |
| 0636302014 | SCREW PLUG | Seals oil passages in the transmission housing |
Frequently Asked Questions
Q: Can the 4108.302.190 planetary gear be used in a WG200 transmission?
A: Yes, this gear is compatible with WG200 models that use the same planetary carrier design. However, you must confirm your transmission’s build date and serial number, as later WG200 units may use a different tooth profile.
Q: What other parts should I replace when installing a new planetary gear?
A: It is strongly recommended to replace the 0501325471 SEALING RING and both housing units (4108101120 and 4108201307) if they show scoring or wear. Additionally, inspect the 0750116277 BALL BEARING for play.
Q: How do I identify a genuine ZF 4108.302.190 gear from a counterfeit?
A: Genuine parts have a laser-etched ZF logo and part number on the gear face. The case hardening depth should measure at least 0.8 mm. Counterfeits often have rough machining marks and inconsistent tooth spacing.
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ZF 4108.302.190 PLANETARY GEAR – Gear RFQ Support
ZF 4108.302.190 PLANETARY GEAR is handled as a gear-train sourcing item for transmission repair teams. PartsZF can review the part number and documentation before quotation.
Part-Number Summary
Use ZF number 4108.302.190 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: INPUT
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 | 4108.302.190 |
|---|---|
| Normalized SKU | 4108302190 |
| Part name | PLANETARY GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
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.
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