Overview
The ZF 4108.303.372 PLANET CARRIER is a critical rotating assembly within the planetary gear set of heavy-duty ZF transmissions used in construction machinery. This OEM genuine part transfers torque from the sun gear to the planetary gears, enabling the speed reduction and torque multiplication necessary for high-load operations like earthmoving and excavation. The SKU 4108.303.372 is precision-machined to maintain exact gear mesh alignment, ensuring smooth power flow through the drivetrain. It works in direct conjunction with the 4108101062 HOUSING and the 4108201297 HOUSING to form a sealed, lubricated chamber for the planetary gears.
Symptoms of Failure
- Grinding or whining noise during gear engagement: Worn carrier bearings or distorted carrier pockets cause uneven gear contact, producing audible metal-on-metal sounds under load.
- Intermittent power loss or transmission slipping: A cracked or fatigued planet carrier allows planetary gears to shift out of alignment, resulting in sudden torque loss during acceleration or climbing.
- Metallic debris in transmission fluid: As the carrier wears, small particles of hardened steel separate from the carrier body, contaminating the oil and accelerating damage to other components like the 0501215601 OIL LEVEL GAGE and 0501325470 SEALING RING.
- Excessive vibration at idle or low speed: A warped planet carrier creates rotational imbalance, transmitting harsh vibrations through the transmission housing and into the operator cab.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4108.303.372 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.85 kg (10.7 lbs) |
| Outer Diameter | 172 mm |
| Inner Diameter (Bore) | 62 mm |
| Overall Height | 68 mm |
| OEM Reference | ZF 4108.303.372 |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This planet carrier is engineered for ZF WG series powershift transmissions commonly found in wheel loaders, graders, and telehandlers. It is a direct replacement for the following transmission models: WG180, WG200, WG210, and WG240. The 4108.303.372 carrier interfaces with the 4108301474 INPUT SHAFT and is retained by 0630502039 RETAINING RING and 0630531064 RETAINING RING. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101062 | HOUSING | Encloses the planetary gear set |
| 4108201297 | HOUSING | Rear transmission housing support |
| 0501215601 | OIL LEVEL GAGE | Monitors transmission fluid level |
| 0501325470 | SEALING RING | Prevents oil leakage at carrier joint |
| 0730365280 | TYPE PLATE | Identification plate for transmission model |
| 4108301474 | INPUT SHAFT | Transfers engine power to planetary set |
| 0750116277 | BALL BEARING | Supports rotating carrier shaft |
| 0630502039 | RETAINING RING | Secures carrier axial position |
| 0630531064 | RETAINING RING | Secondary carrier retention ring |
| 0636302014 | SCREW PLUG | Seals oil passage in carrier hub |
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