Overview
The ZF 4699.300.098 INNER DISK CARRIER is a critical rotating component within the clutch pack assembly of heavy-duty ZF powershift transmissions. This OEM genuine part functions as the central hub that houses and aligns the friction and steel discs, transmitting torque from the clutch piston to the gear train. Located inside the main transmission housing, the carrier interfaces directly with the GEAR SHAFT and the PLANET CARRIER to ensure smooth power flow. The SKU 4699.300.098 is precision-machined to maintain exact axial clearance, preventing disc slippage under high-load conditions in construction machinery applications.
Symptoms of Failure
- Delayed engagement or clutch shudder – When the inner disk carrier splines wear, the clutch discs fail to seat properly, causing a noticeable lag or vibration when shifting from neutral to drive in wheel loaders and dozers.
- Metallic debris in transmission oil – Worn carrier splines shed fine metal particles into the hydraulic circuit, often detected during routine oil sampling or when the magnetic drain plug shows excessive sludge.
- Intermittent gear slipping under load – A damaged carrier cannot maintain disc pack compression, leading to torque loss when the machine is under heavy strain, such as climbing grades or pushing material.
- Overheating in the clutch housing – Friction from a misaligned carrier generates excessive heat, which may trigger transmission temperature warnings or cause burnt oil smell from the breather.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.300.098 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Outer Diameter | 198 mm (7.80 in) |
| Inner Diameter | 142 mm (5.59 in) |
| Height / Thickness | 48 mm (1.89 in) |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4699.300.098 |
| Spline Count | 36 internal / 42 external |
Compatibility
This inner disk carrier is engineered for ZF WG series powershift transmissions commonly found in construction machinery. It is a direct fit for the WG180, WG200, and WG210 models used in articulated dump trucks, graders, and excavators. The part also integrates with the HOUSING assembly and the BASIC PARTS kit, which includes all necessary seals and snap rings for a complete overhaul. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699100023 | BASIC PARTS | Seal and snap ring kit for clutch pack rebuild |
| 4699300138 | HOUSING | Outer casing that encloses the carrier and discs |
| 4699300156 | GEAR SHAFT | Input shaft that drives the carrier assembly |
| 4699300127 | PLANET CARRIER | Planetary gear set carrier for torque multiplication |
| 4699200011 | RING GEAR | Stationary gear that meshes with planetary pinions |
| 4699300152 | TOOTHED DISC | Friction disc for clutch engagement |
| 4699300153 | RING GEAR | Secondary ring gear for dual-planet configurations |
| 4699300154 | RING | Retaining ring for disc pack preload |
| 4699300128 | PLANETARY GEAR | Individual pinion gear for planetary set |
| 4699195076 | PLANETARY GEAR | Alternate pinion gear for high-torque variants |
