Overview
The ZF 2099.056.006 TRA 09 is a precision-engineered internal component designed for heavy-duty construction machinery transmissions. Specifically, this part functions as a critical load-bearing element within the final drive assembly, managing torque distribution from the differential to the axle shafts. As an OEM genuine part (SKU: 2099.056.006), it ensures exact fitment and material integrity required for high-stress earthmoving applications. This component sits directly between the differential housing and the axle bevel gear set, where it facilitates smooth power transfer under extreme loads.
Symptoms of Failure
- Oil leaks near the axle housing: When the 2099.056.006 seal surface wears, hydraulic fluid seeps past the component, leaving visible drips under the machine after operation.
- Intermittent gear slipping under load: A worn TRA 09 can cause momentary loss of traction when the excavator or loader encounters hard-packed material, often misdiagnosed as a clutch issue.
- Metallic grinding noise during turns: As the part degrades, it produces a distinct scraping sound when the machine articulates, indicating uneven wear on the differential bevel gear interface.
- Vibration in the driveline at low speeds: Operators may feel a rhythmic shudder through the floorboard during forward/reverse transitions, signaling misalignment caused by this worn component.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 2099.056.006 |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 4.2 kg (9.3 lbs) |
| Outer Diameter | 185 mm |
| Inner Diameter | 72 mm |
| Height | 48 mm |
| OEM Reference | ZF TRA 09 |
| Surface Treatment | Phosphate coating + oil impregnation |
Compatibility
This ZF 2099.056.006 TRA 09 is primarily compatible with the following ZF transmission models used in construction machinery: WG180, WG200, WG210, and WG211 series. It also fits select ZF Ergopower and ZF Ecolite final drive assemblies found in wheel loaders, telehandlers, and backhoe loaders manufactured between 2005-2020. Always verify the axle housing configuration before installation.
When replacing this part, it is essential to inspect the surrounding assembly. The 2099109018 DIFFERENTIAL often shows correlated wear patterns, as does the 2099364014 CROWN WHEEL. For complete driveline restoration, consider pairing this TRA 09 with the 2099209001 DIFFERENTIAL and the 2098309010 DIFFERENTIAL HOUSING to prevent premature failure.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2099109018 | DIFFERENTIAL | Distributes torque between left/right wheels |
| 2099364014 | CROWN WHEEL | Transfers rotational force from pinion to differential |
| 2099209001 | DIFFERENTIAL | Alternate differential assembly for WG200 series |
| 2098309010 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 2098309009 | DIFFERENTIAL HOUSING | Reinforced housing for heavy-load applications |
| 2098309031 | AXLE BEVEL GEAR | Changes torque direction from driveshaft to axle |
| 2098309030 | AXLE BEVEL GEAR | Matched set with 2098309031 for gear mesh |
| 2098309032 | DIFFERENTIAL BEVEL GEAR | Allows wheel speed differentiation during turns |
| 12883200682 | THRUST WASHER | Reduces axial friction between rotating gears |
| 0635332059 | BALL BEARING | Supports radial loads on differential shaft |
