Overview
The ZF 4699.303.124 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. As the structural hub that holds the planetary pinions, the carrier must withstand extreme cyclic stresses. The SKU 4699.303.124 is precision-machined to OEM tolerances to ensure proper gear alignment and load distribution. When replacing this component, it is essential to also inspect the adjacent 4699101155 HOUSING and the 4699201018 HOUSING for wear, as these parts form the sealed environment for the planetary assembly.
Symptoms of Failure
- Intermittent gear slipping under load: A worn planet carrier can cause uneven gear meshing, leading to momentary loss of drive power when the machine is under heavy strain.
- Metallic grinding noise from transmission: As the carrier pockets wear, planetary pinions can shift, producing a distinct grinding or rumbling sound during gear changes.
- Contaminated transmission fluid with metallic debris: Fatigue cracks in the carrier web release fine steel particles into the oil, visible during routine fluid sampling.
- Vibration during forward/reverse shifting: A distorted carrier creates imbalance in the planetary set, causing noticeable driveline shudder during directional changes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.303.124 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 180 mm (estimated) |
| Overall Height | 95 mm (estimated) |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4699.303.124 |
| Hardness | 58-62 HRC (case depth 0.8 mm) |
Compatibility
This planet carrier is designed for use in ZF WG series transmissions commonly found in wheel loaders, graders, and dump trucks. It is compatible with the following ZF transmission models: WG180, WG200, WG210, and WG220. The carrier interfaces directly with the 4699309077 HOUSING COVER which seals the planetary gear set. During installation, always use new 0636100132 TORX SCREW fasteners to secure the carrier to the output shaft, as these bolts are torque-to-yield and must not be reused.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101155 | HOUSING | Encloses the planetary carrier assembly |
| 4699201018 | HOUSING | Secondary housing for clutch pack support |
| 4699309077 | HOUSING COVER | Seals the planetary gear cavity |
| 0636100132 | TORX SCREW | Fastens carrier to output shaft |
| 0631302072 | CYLINDRICAL PIN | Aligns carrier to housing |
| 0634801038 | SEALING RING | Prevents oil leakage at carrier interface |
| 0636302013 | SCREW PLUG | Closes oil passages in housing |
| 0501319149 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0637101790 | BREATHER | Equalizes pressure inside transmission |
| 0631302221 | CYLINDRICAL PIN | Locates cover on housing |
