Overview
The ZF 0501.009.391 BRAKE is a critical OEM genuine component designed to manage torque load and rotational deceleration within heavy-duty construction machinery transmissions. Positioned directly on the output shaft assembly, this brake unit ensures controlled stopping power and prevents unintended driveline movement during operation. The SKU 0501.009.391 is engineered to exact ZF tolerances, making it a direct replacement for worn or failed braking elements in demanding off-highway applications. When paired with the 4699103060: OUTPUT assembly, this brake delivers consistent clamping force under high thermal stress.
Symptoms of Failure
- Delayed stopping response or brake fade — If the machine takes longer to halt when the brake is engaged, the friction material on the 0501.009.391 may be glazed or worn below specification.
- Intermittent gear slipping under load — A failing brake can allow the output shaft to rotate slightly, causing the transmission to lose engagement, especially when paired with a worn 4699003082: GK20 clutch pack.
- Hydraulic fluid contamination near the brake housing — Leaking seals around the brake piston allow oil to bypass, reducing clamping pressure and leaving visible residue on the 4699101097: HOUSING.
- Abnormal grinding or squealing noise during braking — Metal-to-metal contact indicates the brake disc has worn past its service limit, often requiring simultaneous inspection of the 4699102166: INPUT shaft splines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.009.391 |
| Type | Wet Multi-Disc Brake |
| Outer Diameter | 195 mm |
| Inner Diameter | 125 mm |
| Thickness (Assembled) | 28 mm |
| Material | Sintered Bronze Friction / Steel Core |
| Weight | 1.45 kg |
| OEM Reference | ZF 0501.009.391 |
| Operating Pressure | 12–18 bar |
Compatibility
This brake is primarily specified for ZF WG180, WG200, and WG210 series powershift transmissions used in wheel loaders, telehandlers, and excavators. It also fits select models of the ZF 4WG-200 and 6WG-200 drivelines. Always verify the spline count and disc stack height against your transmission’s service manual. For complete rebuilds, consider replacing the 4699105010: TURNTABLE BEARING and 0634303141: O-RING simultaneously to prevent future leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699003082 | GK20 | Clutch pack for gear engagement |
| 4699101097 | HOUSING | Encloses brake and clutch assemblies |
| 4699102166 | INPUT | Transfers engine torque to transmission |
| 4699103060 | OUTPUT | Delivers power to the driveline |
| 4699105010 | TURNTABLE BEARING | Supports rotating load in swing drives |
| 4699301183 | HOUSING | Secondary housing for planetary gears |
| 4699301017 | BEARING COVER | Seals and protects bearing cavity |
| 4699301085 | COVER | Closes access ports on transmission case |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303141 | O-RING | Seals hydraulic passages |
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