Overview
The ZF 4656.109.014 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG190 and WG210 transmission series. This OEM genuine part 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 spring-applied, hydraulically-released unit, the 4656.109.014 ensures positive engagement even in the event of hydraulic pressure loss. This parking brake assembly works in concert with the HOUSING REAR PART to maintain structural integrity and alignment under load. The SKU 4656.109.014 is the direct OEM replacement, guaranteeing factory-specified clamping force and wear resistance for heavy-duty industrial applications.
Symptoms of Failure
- Vehicle Creep on Inclines: If the parking brake fails to hold the vehicle stationary on a slope, the internal friction discs or return springs within the 4656.109.014 assembly may be worn or broken.
- Hydraulic Oil Leaks Near the Output Flange: A degraded piston seal inside the parking brake unit allows transmission fluid to escape, often pooling around the HOUS.FRONT SECT interface.
- Delayed or Grinding Engagement: When engaging the parking brake, a grinding noise or a delay of more than one second indicates worn splines or damaged friction material on the 4656.109.014 assembly.
- Intermittent Warning Lights: Modern ZF control systems detect abnormal pressure decay in the brake circuit, often traced back to a failing 4656.109.014 valve body or piston.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4656.109.014 |
| OEM Reference | ZF 4656.109.014 |
| Material | High-strength alloy steel with sintered bronze friction lining |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Outer Diameter | 210 mm |
| Overall Height | 85 mm |
| Operating Pressure | 12–18 bar (hydraulic release) |
| Holding Torque | ≥ 1,200 Nm |
Compatibility
This parking brake is designed for ZF WG-series powershift transmissions used in off-highway and industrial vehicles. It is a direct fit for the WG190 and WG210 series. Based on the mounting pattern and spline count, it is also compatible with the WG180 and WG200 models when used with the correct TRANSMISSION HOUSING. The 4656.109.014 interfaces directly with the output shaft and is secured using a CYLINDRICAL PIN for precise alignment. Always verify the transmission serial number against ZF application charts before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101045 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and supports the parking brake assembly. |
| 4657201027 | HOUS.FRONT SECT | Front section housing that aligns the input shaft and provides mounting points for the brake. |
| 4657201020 | HOUSING REAR PART | Rear housing segment that contains the parking brake drum and output bearing. |
| 0631306792 | CYLINDRICAL PIN | Precision dowel pin used to locate the parking brake housing during assembly. |
| 0636100801 | CAP SCREW | Fastener for securing the brake cover plate to the housing. |
| 4656301148 | FIXING PLATE | Locking plate that prevents the parking brake piston from rotating. |
| 4657301032 | SCREEN SHEET | Fine mesh filter protecting the brake control valve from debris. |
| 4657301033 | SCREEN SHEET | Secondary filter screen for the brake release oil circuit. |
| 0636100803 | CAP SCREW | Bolt for attaching the brake actuator to the housing. |
| 0750301003 | OIL FEED.HOUSG. | Oil feed tube that supplies hydraulic pressure to release the parking brake. |
Frequently Asked Questions
Q: Can the 4656.109.014 parking brake be rebuilt, or must it be replaced entirely?
A: While individual friction discs and seals are available, ZF recommends replacing the complete 4656.109.014 assembly due to the precision fit of the piston and housing. Rebuilding often leads to premature failure if the bore is worn.
Q: How do I know if the 4656.109.014 is compatible with my WG210 transmission?
A: Check the transmission model plate; the WG210 uses a 210mm output flange. The 4656.109.014 is designed for this flange diameter. If your unit has a different flange size, you may need the corresponding TRANSMISSION HOUSING adapter.
Q: What torque should be applied to the cap screws when installing this parking brake?
A: For the CAP SCREW fasteners, use 45 Nm (33 ft-lbs) with thread locker. Over-torquing can distort the housing and cause binding.
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