Overview
The ZF 4699.172.099 STEERING PARTS component is a precision-engineered OEM genuine part designed for the hydraulic steering circuit within heavy-duty construction machinery transmissions. This steering control element regulates oil flow to the steering clutch pack, ensuring precise directional changes and load-holding capability under extreme torque conditions. As a critical wear item in the valve body assembly, the SKU 4699.172.099 interfaces directly with the 4699003064: GK20 II gear set and the 4699101109: HOUSING to maintain consistent hydraulic pressure. Without this part, the transmission cannot execute smooth steering commands, making it essential for wheel loaders, graders, and other articulated vehicles.
Symptoms of Failure
- Erratic steering response or delayed engagement — When the 4699.172.099 wears internally, operators notice a lag between steering wheel input and machine movement, often accompanied by jerky articulation.
- Hydraulic oil leaks around the steering valve body — Degraded seals on this part cause visible fluid seepage, leading to low oil levels and eventual transmission overheating.
- Intermittent loss of steering assist under load — The part may fail to maintain pressure during heavy digging or pushing, causing the machine to drift or refuse to turn.
- Unusual whining or grinding noises from the steering circuit — Internal scoring on the spool or bore creates metallic sounds, indicating imminent failure of the 4699102149: INPUT shaft interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.172.099 |
| Type | Steering Control Spool / Valve |
| Material | Hardened alloy steel with nitrided surface |
| Overall Length | 142 mm (estimated) |
| Outer Diameter | 28 mm (estimated) |
| Weight | 0.45 kg (1.0 lb) |
| OEM Reference | ZF 4699.172.099 |
| Seal Compatibility | 0634303141: O-RING |
| Operating Pressure | 180–220 bar |
Compatibility
This steering part is engineered for ZF WG series powershift transmissions commonly used in construction machinery. It fits the following models: WG180, WG200, WG210, and WG240. The 4699.172.099 is also compatible with certain variants of the ERGO and Powershift 2.0 series. For proper installation, it must be paired with the 4699103030: OUTPUT shaft assembly and the 4699301192: HOUSING to ensure correct alignment of the steering clutch pack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699003064 | GK20 II | Planetary gear set for torque multiplication |
| 4699101109 | HOUSING | Main transmission casing for steering valve |
| 4699102149 | INPUT | Input shaft connecting engine to transmission |
| 4699103030 | OUTPUT | Output shaft transferring power to axles |
| 4699105044 | TURNTABLE BEARING | Rotary bearing for steering articulation |
| 4699301192 | HOUSING | Secondary housing for steering clutch pack |
| 4699301017 | BEARING COVER | Protective cover for steering shaft bearing |
| 4699301085 | COVER | Sealing cover for valve body access port |
| 4699301014 | THREAD PROTECTIVE SHIELD | Thread guard for hydraulic line ports |
| 0634303141 | O-RING | Hydraulic seal for steering valve connections |
