Overview
The ZF 4646.109.423 PARKING BRAKE is a critical OEM sub-assembly engineered for the WG 250, WG 260, and WG 310 series transmissions. This component integrates directly into the rear section of the transmission housing, where it mechanically locks the output shaft to prevent vehicle roll-away when parked. As a precision-machined sub-assembly, the SKU 4646.109.423 interfaces with the TRANSMISSION HOUSING and the HOUSING to create a sealed, high-torque braking system. It is designed for heavy-duty industrial applications, including construction loaders and agricultural tractors, where reliable parking brake engagement is non-negotiable.
Symptoms of Failure
- Transmission oil leaks near the output flange: Worn seals within the 4646.109.423 assembly allow hydraulic fluid to escape, often visible as drips beneath the driveline connection.
- Intermittent parking brake release or sticking: Internal corrosion or debris causes the brake to fail to disengage fully, leading to drag and overheating during operation.
- Audible grinding or clunking when engaging the brake: Damaged friction plates or worn actuator components produce metallic noises, indicating imminent sub-assembly failure.
- Vehicle rolls on inclines despite brake application: Reduced clamping force from fatigued springs or worn linings compromises holding capacity, a critical safety hazard.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.109.423 |
| OEM Reference | ZF 4646.109.423 |
| Material | Steel alloy with corrosion-resistant coating |
| Weight | 4.2 kg (9.3 lbs) |
| Overall Diameter | 210 mm |
| Height | 85 mm |
| Mounting Bolt Pattern | 6x M12 on 160 mm PCD |
| Max Operating Pressure | 12 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This parking brake sub-assembly is specifically validated for the ZF WG 250, WG 260, and WG 310 series transmissions. It also fits the closely related WG 180, WG 200, and WG 258 series models when used with the correct HEXAGON SCREW and CAP SCREW hardware. For proper sealing, ensure the mating surfaces on the transmission housing are clean and free of debris before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101156 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301327 | HOUSING | Intermediate support for brake assembly |
| 0636015304 | HEXAGON SCREW | Fastener for housing attachment |
| 0636101828 | CAP SCREW | High-torque bolt for brake cover |
| 4646301102 | COVER SHEET | Sealing plate for oil containment |
| 4646301285 | COVER SHEET | Secondary sealing gasket |
| 0730365190 | TYPE PLATE | Identification label for assembly |
| 0631311009 | GROOVED STUD | Alignment pin for brake housing |
| 0636101193 | CAP SCREW | Fastener for actuator cover |
| 0636010179 | HEXAGON SCREW | Mounting bolt for sub-assembly |
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