Overview
The ZF 4644.109.210 PARKING BRAKE is a critical safety component designed specifically for the WG 200 Series transmission. This OEM genuine part engages a mechanical locking mechanism within the transmission output housing, preventing vehicle roll-away when parked. It interfaces directly with the driveline brake drum and the shift system to ensure secure stationary hold under load. The SKU 4644.109.210 is engineered to ZF’s exacting tolerances, providing reliable engagement and disengagement in heavy-duty industrial applications. When paired with a robust 4644101223: TRANSMISSION HOUSING, this parking brake assembly maintains structural integrity even under extreme torque conditions.
Symptoms of Failure
- Vehicle creep on inclines: If the parking brake fails to hold the transmission output shaft stationary, the vehicle may slowly roll forward or backward on slopes, indicating worn brake pads or a seized actuator.
- Grinding noise during engagement: A metallic scraping sound when applying the parking brake suggests damaged brake shoes or a misaligned linkage, often accompanied by reduced holding force.
- Oil seepage near the brake housing: Leaks around the output flange or brake cover plate point to degraded seals, such as the 0634306525: O-RING, which can contaminate brake surfaces and reduce friction.
- Intermittent brake release failure: Difficulty disengaging the parking brake, often requiring excessive force, indicates corrosion or wear in the internal spring mechanism or the 4644301298: COVER PLATE assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.109.210 |
| OEM Reference | ZF 4644.109.210 |
| Material | High-strength steel with corrosion-resistant coating |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 95 mm |
| Brake Type | Mechanical drum brake with spring-actuated release |
| Max Holding Torque | 450 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This parking brake is primarily designed for the ZF WG 200 Series transmissions, including models such as WG180, WG200, and WG210. It is also compatible with select variants of the ZF Ecomat 4HP and 5HP series that share the same output housing configuration. For proper fitment, verify that your transmission uses the 4644301225: TRANSMISSION HOUSING and the 0730365125: TYPE PLATE to confirm model identification. The brake assembly integrates with the 4644106300: SHIFT SYSTEM for proper actuation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Encloses and supports internal transmission components |
| 4644301225 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series |
| 0730365125 | TYPE PLATE | Identification plate for transmission model and specs |
| 4644301298 | COVER PLATE | Seals the parking brake access opening |
| 0634306525 | O-RING | Prevents oil leaks at brake housing joints |
| 0636305026 | SCREW PLUG | Seals fluid passages in the brake assembly |
| 4644301279 | SCREEN SHEET | Filters debris from brake actuation fluid |
| 4644301088 | SEALING CAP | Protects brake linkage from contamination |
| 4644106300 | SHIFT SYSTEM | Controls parking brake engagement via mechanical linkage |
| 4644306500 | COVER PLATE | Secondary cover for shift system access |
