Overview
The ZF 4108.302.088 PLANETARY GEAR is a critical torque-multiplying component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part resides within the planetary gearset assembly, directly transferring rotational force from the input shaft to the output shaft while managing speed reduction. The SKU 4108.302.088 ensures precise gear meshing and load distribution, working in concert with the 4108101086 HOUSING and the 4108201287 HOUSING to maintain structural integrity under heavy industrial loads. Its failure can cascade into driveline inefficiency, making it a cornerstone of transmission reliability.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn planetary gears produce a distinct high-pitched whine or metallic grinding, especially under load or during deceleration.
- Erratic gear slipping or delayed engagement: As the gear teeth wear, the transmission may slip out of gear or hesitate when shifting, leading to inconsistent power delivery.
- Metallic debris in transmission fluid: Flakes or particles in the oil pan signal advanced gear wear, often accompanied by a burnt smell from overheated fluid.
- Vibration through the drivetrain: Uneven gear wear causes harmonic vibrations that intensify at specific RPM ranges, felt through the chassis or shift lever.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4108.302.088 |
| Type | Planetary Gear (Sun/Planet Carrier Assembly) |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Outer Diameter | 185 mm (7.28 in) |
| Inner Diameter (Bore) | 65 mm (2.56 in) |
| Overall Length | 95 mm (3.74 in) |
| Weight | 4.2 kg (9.26 lbs) |
| OEM Reference | ZF 4108.302.088 |
| Tooth Count (Sun) | 24 |
| Heat Treatment | Carburized & Tempered to HRC 58-62 |
Compatibility
This planetary gear is specifically designed for ZF WG100, WG130, and WG131 transmissions, commonly found in medium-duty trucks, buses, and construction equipment. It also fits select WG180 and WG200 variants when used with the 4108301293 BEARING COVER and proper shimming. Always verify your transmission model number before installation. The 0501215601 OIL LEVEL GAGE should be checked post-installation to ensure correct fluid levels.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101086 | HOUSING | Encloses planetary gearset, supports bearings |
| 4108201287 | HOUSING | Secondary housing for output shaft alignment |
| 0501215601 | OIL LEVEL GAGE | Monitors transmission fluid level |
| 4108301293 | BEARING COVER | Seals and protects planetary bearings |
| 4108306172 | GASKET | Prevents fluid leaks between housings |
| 0730365280 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Fastener for planetary carrier assembly |
| 4108301475 | INPUT SHAFT | Transfers engine torque to planetary gear |
| 0750116277 | BALL BEARING | Supports rotating planetary carrier |
| 0630502039 | RETAINING RING | Secures bearings and gears in position |
ZF 4108.302.088 PLANETARY GEAR – Gear RFQ Support
ZF 4108.302.088 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 4108.302.088 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 | 4108.302.088 |
|---|---|
| Normalized SKU | 4108302088 |
| 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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- ZF 4143.142.022 GEAR SHIFT SENSOR
