Overview
The ZF 4657.109.422 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 210 Series transmission. This OEM genuine part integrates directly into the rear section of the transmission assembly, where it engages the output shaft to prevent vehicle roll when parked or during stationary operation. As a mechanical locking mechanism, it works in concert with the HOUSING REAR PART to ensure secure engagement. The SKU 4657.109.422 is precision-machined to ZF’s original tolerances, guaranteeing a direct fit and reliable performance in demanding industrial applications such as forklifts, reach stackers, and heavy-duty material handlers.
Symptoms of Failure
- Inability to hold the vehicle on an incline: When the parking brake fails to secure the transmission output shaft, the machine may roll unexpectedly on slopes, indicating worn friction surfaces or broken internal springs.
- Grinding or scraping noises during engagement: A metallic sound when applying or releasing the parking brake suggests damaged brake pads or a misaligned actuation mechanism within the WG210 assembly.
- Excessive free play in the parking brake lever: If the lever or actuator moves further than normal before resistance is felt, internal components like the CYLINDRICAL PIN may be worn or the brake linkage has stretched.
- Oil contamination near the brake housing: Leaking transmission fluid from the rear section often points to a failed seal around the parking brake drum, requiring immediate replacement of the 4657.109.422 unit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.109.422 |
| OEM Reference | ZF 4657.109.422 |
| Material | High-strength alloy steel with hardened friction lining |
| Weight | 2.8 kg (6.2 lbs) |
| Outer Diameter | 180 mm |
| Inner Spline Diameter | 45 mm |
| Operating Temperature Range | -20°C to +120°C |
| Compatible Housing | HOUS.FRONT SECT and TRANSMISSION HOUSING |
Compatibility
This parking brake is designed for the ZF WG 210 Series transmission family. It is also compatible with the WG180, WG200, and WG211 models that share the same rear housing architecture. The 4657.109.422 interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to create a sealed brake chamber. For proper installation, ensure the CYLINDRICAL PIN is correctly aligned to prevent binding. This part is not interchangeable with earlier WG series brakes without verifying housing dimensions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear housing that encloses the parking brake |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for brake assembly |
| 0636100801 | CAP SCREW | Fastener for housing attachment |
| 4656301148 | FIXING PLATE | Secures brake components in position |
| 4657301034 | SCREEN SHEET | Filter screen for oil flow |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Additional housing fastener |
| 4681301040 | OIL FEED.HOUSG. | Lubrication feed to brake assembly |
