Overview
The ZF 0899.198.442 BRAKE is a critical internal component engineered specifically for the WG 100 series of powershift transmissions. This OEM genuine part functions as a friction brake assembly, designed to halt rotating elements within the gear train during clutch-to-clutch shifts. Positioned within the planetary gear set, it ensures precise engagement and disengagement of gear ratios. The SKU 0899.198.442 is a direct replacement for worn units, restoring the transmission’s ability to hold torque under load. When installed alongside the 4651101014: TRANSMISSION HOUSING, this brake provides the necessary stopping force for smooth directional changes.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the brake disc stack wears thin, the transmission fails to hold the selected gear, causing the vehicle to creep or lose power on inclines.
- Erratic shift timing and harsh engagement: A failing brake causes the transmission to “flare” between gears, as the hydraulic pressure cannot properly clamp the friction surfaces.
- Metallic grinding noise during gear changes: Worn friction material or damaged steel plates produce a distinct scraping sound, particularly when shifting from forward to reverse.
- Dark, burnt transmission fluid with debris: Overheated brake material contaminates the oil, leaving visible particles and a strong burnt odor during fluid inspection.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0899.198.442 |
| Component Type | Friction Brake Assembly |
| Outer Diameter | 198 mm |
| Inner Diameter | 142 mm |
| Thickness (Stack Height) | 28.5 mm |
| Material | Sintered Bronze on Steel Core |
| Weight | 1.45 kg |
| OEM Reference | ZF 0899.198.442 |
Compatibility
This brake assembly is designed for the ZF WG 100 series transmission family. Based on its dimensions and spline pattern, it is compatible with the following models: WG100, WG120, WG150, WG180, and WG200. It is commonly used in off-highway vehicles such as forklifts, telehandlers, and wheel loaders. For proper installation, ensure the 4651301029: HOUSING is free of scoring, and replace the 0634303928: O-RING to prevent fluid bypass. The brake also interfaces directly with the 4651301036: TRANSMISSION HOUSING to maintain proper alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101014 | TRANSMISSION HOUSING | Encloses the gear train and brake assembly |
| 4651301029 | HOUSING | Supports the brake piston and clutch pack |
| 0634303928 | O-RING | Seals hydraulic pressure to the brake circuit |
| 4651301036 | TRANSMISSION HOUSING | Provides bearing support for the output shaft |
| 4651203002 | SCREEN SHEET | Filters debris from the brake oil supply |
| 4651303005 | SCREEN SHEET | Secondary filtration for the lubrication circuit |
| 0636101032 | CAP SCREW | Secures the brake pressure plate |
| 0630361028 | SEALING CAP | Protects the brake adjustment access port |
| 4475280060 | SCREW PLUG | Closes the brake test pressure port |
| 0634303312 | O-RING | Seals the screw plug against leakage |
