Overview
The ZF 4699.109.021 BRAKE is a critical OEM genuine component engineered for heavy-duty braking within ZF construction machinery transmissions. This part functions as a friction-based stopping mechanism, directly engaging within the planetary gearset to control output shaft rotation and hold the machine stationary under load. As an integral element of the hydraulic clutch pack assembly, the SKU 4699.109.021 ensures precise torque modulation and reliable parking brake functionality. When paired with the 4699101046 HOUSING, it creates a sealed chamber that maintains consistent hydraulic pressure for engagement. This brake unit is designed to withstand extreme thermal and mechanical stress common in excavators, loaders, and graders operating in demanding environments.
Symptoms of Failure
- Transmission brake drag or incomplete release: Worn friction surfaces cause the brake to remain partially engaged, leading to overheating and reduced fuel efficiency. This often manifests as a “machine creeping” symptom on slopes.
- Oil contamination from brake debris: As the friction material degrades, metallic particles enter the hydraulic circuit, clogging valves and accelerating wear on adjacent components like the 4699301109 HOUSING.
- Erratic stopping power or brake fade: Loss of clamping force results in longer stopping distances, particularly noticeable during repeated high-load cycles in construction applications.
- Audible grinding or squealing during engagement: Metal-on-metal contact indicates the friction lining has worn below minimum thickness, requiring immediate replacement to prevent damage to the 4699301017 BEARING COVER.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.109.021 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 180 mm (7.09 in) |
| Inner Diameter | 120 mm (4.72 in) |
| Thickness | 4.5 mm (0.177 in) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4699.109.021 |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
Compatibility
This brake plate is specifically designed for ZF WG series transmissions commonly used in construction machinery. Verified compatible models include the WG180, WG200, and WG210 series. It also fits select ZF 4WG-200 and ZF 5WG-210 variants. For proper installation, ensure the mating surfaces of the 4699301085 COVER are clean and free of burrs. Always replace the 0634303141 O-RING and 0634309600 SHAFT SEAL during brake service to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Encloses brake pack and directs hydraulic flow |
| 4699301109 | HOUSING | Secondary housing for clutch/brake assembly |
| 4699301017 | BEARING COVER | Seals bearing cavity and retains lubrication |
| 4699301085 | COVER | Protects brake piston from debris ingress |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303141 | O-RING | Seals hydraulic pressure between components |
| 0734307407 | PROTECTION CAP | Covers exposed ports during transport |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shaft |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
| 0636102023 | CAP SCREW | Secures brake pack to transmission housing |
