Overview
The ZF 4699.109.043 BRAKE PARTS assembly is a critical internal component designed to manage torque interruption and provide controlled deceleration within heavy-duty construction machinery transmissions. Specifically engineered as an OEM genuine part, this brake component sits within the clutch pack housing of the transmission, interfacing directly with the hydraulic actuation system to engage and disengage rotational force. The SKU 4699.109.043 is precision-machined to ZF’s exacting tolerances, ensuring reliable stopping power under extreme load conditions. This part is often replaced during a major transmission overhaul when the friction surfaces have exceeded their service life, and it works in concert with the 4699101070: HOUSING and 4699301146: HOUSING to maintain structural integrity of the brake assembly.
Symptoms of Failure
- Delayed or incomplete braking response: When the 4699.109.043 wears, operators notice a lag between pedal input and machine deceleration, often described as “soft brakes” in wheel loaders or graders.
- Transmission fluid contamination: Worn brake material sheds particulate debris into the hydraulic circuit, causing dark, metallic-flecked oil that accelerates wear on seals and valves.
- Intermittent gear slippage under load: A failing brake pack cannot hold torque, leading to unexpected disengagement when the machine is pushing or lifting heavy materials.
- Audible grinding or chattering: Metal-on-metal contact from worn friction plates produces a distinct grinding noise during low-speed maneuvering, indicating imminent catastrophic failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4699.109.043 |
| OEM Reference | ZF 4699.109.043 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 150 mm (estimated) |
| Thickness | 4.5 mm (new, nominal) |
| Weight | 0.85 kg |
| Torque Capacity | 1,200 Nm (peak) |
Compatibility
This genuine ZF brake part is primarily compatible with the WG180 and WG200 series power shift transmissions commonly found in articulated dump trucks, wheel loaders, and crawler dozers. It also fits select models in the WG150 and WG250 families where the brake pack configuration matches the 4699.109.043 spline pattern and pressure plate geometry. Always verify the transmission serial number against ZF’s parts catalog before ordering. The 4699309085: HOUSING COVER and 0636101411: CAP SCREW are frequently replaced concurrently during this service interval.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101070 | HOUSING | Encloses the brake pack and directs hydraulic flow |
| 4699301146 | HOUSING | Secondary housing for clutch/brake support |
| 4699309085 | HOUSING COVER | Seals the brake chamber and retains pressure |
| 0636101411 | CAP SCREW | Fastens housing components to specified torque |
| 0631302212 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634801038 | SEALING RING | Prevents fluid bypass at housing joints |
| 0501319149 | SCREW PLUG | Closes hydraulic test ports |
| 0637885613 | BREATHER | Equalizes internal pressure and vents moisture |
| 0730365801 | TYPE PLATE | Identifies transmission model and serial number |
| 4699102105 | INPUT | Transfers engine torque to the transmission |
