Overview
The ZF 4108.303.298 PLANETARY GEAR is a critical rotating assembly within the WG100, WG130, and WG131 series transmissions. This OEM genuine component functions as the primary torque-multiplying element, transferring power from the turbine shaft to the output carrier. Positioned directly within the main gear train, the planetary gear set (SKU: 4108.303.298) works in conjunction with the TRANSMISSION HOUSING to maintain precise gear mesh alignment. When installed alongside the HOUSING, this gear ensures smooth ratio changes under heavy load conditions.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn planetary gears cause intermittent power loss during acceleration, especially when climbing grades or hauling heavy payloads.
- Metallic grinding or whining noise from the transmission: Pitted or chipped gear teeth produce a distinct high-pitched whine that intensifies with engine RPM, indicating imminent failure.
- Contaminated transmission fluid with metallic debris: Flakes or silver particles in the oil signal advanced wear of the planetary carrier bearings or gear surfaces.
- Delayed or harsh shifting between forward gears: A failing planetary set disrupts hydraulic pressure modulation, causing abrupt engagement or hesitation when shifting from neutral to drive.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.303.298 |
| Gear Type | Planetary (Sun/Planet/Carrier) |
| Material | Case-hardened alloy steel (20MnCr5) |
| Outer Diameter | 185 mm (approx.) |
| Overall Height | 95 mm (approx.) |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4108.303.298 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This planetary gear is engineered for ZF WG-series powershift transmissions. Verified compatible models include WG100, WG130, and WG131. It may also fit select WG180 and WG200 variants when used with the correct COVER and HEXAGON SCREW kit. Always verify the TYPE PLATE on your transmission housing to confirm exact fitment. For proper installation, ensure the SCREW PLUG and OIL LEVEL GAGE are correctly torqued to prevent fluid loss.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101128 | TRANSMISSION HOUSING | Encloses gear train and supports planetary carrier |
| 4108201296 | HOUSING | Intermediate casing for clutch pack assembly |
| 4475280018 | SCREW PLUG | Seals hydraulic passages in the valve body |
| 0501215601 | OIL LEVEL GAGE | Dipstick for checking transmission fluid level |
| 4108303034 | COVER | Protects planetary gear from debris ingress |
| 0636015120 | HEXAGON SCREW | Fastens cover to transmission housing |
| 0636302015 | SCREW PLUG | Seals drain/fill ports on the transmission pan |
| 0501325471 | SEALING RING | Prevents oil leaks at shaft interfaces |
| 0730365280 | TYPE PLATE | Identification label for transmission model |
| 4108108026 | INTERM.GEARBOX | Intermediate gearbox for PTO drive |
Frequently Asked Questions
Q: Can the 4108.303.298 planetary gear be replaced without removing the entire transmission?
A: Yes, but it requires partial disassembly of the main housing. You must first remove the COVER and drain the fluid. Access to the planetary carrier is possible after detaching the TRANSMISSION HOUSING.
Q: What is the typical service life of this planetary gear in a WG130?
A: Under normal operating conditions with proper lubrication and using the correct OIL LEVEL GAGE to maintain fluid levels, the gear typically lasts 8,000–12,000 hours before requiring inspection.
Q: Does this part include the sun gear and carrier, or is it just the planet gears?
A: The 4108.303.298 is a complete planetary gear set including the sun gear, three planet gears, carrier, and thrust washers. The SCREW PLUG and SEALING RING are sold separately for reinstallation.
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ZF 4108.303.298 PLANETARY GEAR – Gear RFQ Support
Use ZF 4108.303.298 PLANETARY GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4108.303.298 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: OUTPUT
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 | 4108.303.298 |
|---|---|
| Normalized SKU | 4108303298 |
| Part name | PLANETARY GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
| Weight | 6.1 |
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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