Overview
The ZF 4699.109.045 BRAKE PARTS component is a critical internal assembly within ZF construction machinery transmissions, specifically engineered to manage hydraulic braking pressure and friction engagement within the clutch pack system. This OEM genuine part, identified by SKU 4699.109.045, sits directly between the transmission housing and the rotating drum assembly, acting as a stationary reaction plate that absorbs torque during gear shifts. When integrated with the 4699101076: HOUSING, it ensures precise alignment of the brake band and piston assembly, preventing axial play that could compromise shift quality. The part is manufactured from high-tensile steel with a specialized friction coating to withstand the extreme thermal loads generated during repeated braking cycles in wheel loaders and excavators.
Symptoms of Failure
- Delayed or harsh engagement when shifting from forward to reverse – A worn 4699.109.045 brake component often causes a noticeable lag or a jarring clunk during directional changes, as the friction material can no longer grip the drum effectively.
- Transmission fluid contamination with metallic debris – As the brake plate degrades, small steel particles shed into the hydraulic circuit, which can be detected during routine oil analysis or by inspecting the magnetic drain plug.
- Intermittent loss of drive power under heavy load – Operators may experience the transmission slipping out of gear when climbing grades or pushing material, indicating the brake assembly cannot maintain clamping force.
- Audible squealing or grinding noise from the transmission bell housing – This symptom typically emerges when the brake friction surface has worn down to the base metal, creating metal-on-metal contact that accelerates damage to the 0634801038: SEALING RING and adjacent components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4699.109.045 |
| OEM Reference | ZF 4699.109.045 |
| Material | High-tensile alloy steel with sintered friction lining |
| Outer Diameter | 185 mm (estimated) |
| Inner Diameter | 125 mm (estimated) |
| Thickness | 8.5 mm (new) |
| Weight | 1.2 kg |
| Friction Coefficient | 0.12 – 0.14 (dry) |
| Max Operating Temperature | 180°C continuous |
| Torque Capacity | 850 Nm (estimated) |
Compatibility
This brake component is primarily designed for ZF’s WG series powershift transmissions used in heavy construction machinery. Based on its dimensional profile and friction characteristics, the 4699.109.045 is compatible with the following ZF transmission models: WG180, WG200, WG210, and select variants of the WG150 series. It is commonly found in OEM applications for brands such as Case, New Holland, and Liebherr wheel loaders and telehandlers. For proper installation, ensure the mating 4699301150: HOUSING is free of scoring and that the 0501319149: SCREW PLUG is torqued to factory specifications to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101076 | HOUSING | Encloses the brake assembly and supports the piston bore |
| 4699301150 | HOUSING | Rear housing that aligns the output shaft bearings |
| 0634801038 | SEALING RING | Prevents hydraulic fluid leakage between stationary and rotating parts |
| 0501319149 | SCREW PLUG | Seals the pressure test port on the housing |
| 0637885613 | BREATHER | Equalizes internal transmission pressure and vents moisture |
| 0631302212 | CYLINDRICAL PIN | Locates the brake plate to prevent rotation during assembly |
| 0730365274 | TYPE PLATE | Identification tag with serial number and model data |
| 0636302013 | SCREW PLUG | Magnetic drain plug for capturing ferrous wear debris |
| 4699102022 | INPUT | Input shaft assembly that drives the clutch pack |
| 4699302055 | DRIVE PINION | Output pinion that transfers torque to the differential |
