Overview
The ZF 4699.172.122 STEERING PARTS component is a precision-engineered OEM genuine part designed for the hydraulic steering control assembly within ZF construction machinery transmissions. This critical element manages directional fluid flow, enabling precise operator control of heavy equipment. The SKU 4699.172.122 interfaces directly with the steering valve body, converting mechanical input into hydraulic pressure for smooth articulation. As a wear-sensitive component, it ensures responsive steering under extreme loads, making it essential for maintaining operational safety in excavators, loaders, and graders.
Symptoms of Failure
- Erratic steering response or delayed engagement: When the 4699.172.122 wears, operators may experience a lag between steering wheel input and machine movement, often accompanied by a “spongy” feel in the controls.
- Hydraulic fluid contamination: Internal degradation of this steering part can introduce metallic particles into the transmission fluid, visible as dark streaks or sludge in the reservoir.
- Audible whining or grinding noises: A high-pitched sound during turns indicates excessive clearance or scoring on the steering spool surface, requiring immediate replacement.
- Intermittent loss of power steering assist: Sudden resistance or jerky motion during low-speed maneuvers signals that the 4699.172.122 is failing to maintain proper hydraulic pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.172.122 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Overall Length | 185 mm (7.28 in) |
| Outer Diameter | 42 mm (1.65 in) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4699.172.122 |
| Operating Pressure | 210 bar (3045 psi) |
| Temperature Range | -20°C to +120°C (-4°F to +248°F) |
Compatibility
This steering component is engineered for ZF WG series transmissions commonly found in construction machinery. It is compatible with the following models: WG180, WG200, WG210, and WG250. The 4699.172.122 also fits select variants of the ZF WG150 and WG300 series, particularly those equipped with hydraulic power steering systems. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699008051 | GK16 | Gear kit for steering pump drive |
| 4699101181 | HOUSING | Main steering valve housing |
| 4699102193 | INPUT | Input shaft for steering control |
| 4699103131 | OUTPUT | Output flange for steering linkage |
| 4699105132 | HOUSING TOP PART | Upper housing cover for steering assembly |
| 4699301191 | HOUSING | Secondary steering housing |
| 4699301041 | COVER | Protective cover for steering unit |
| 0634303936 | O-RING | Seal between steering components |
| 0630513203 | SNAP RING | Retaining ring for shaft assembly |
| 0750110302 | SHAFT SEAL | Dynamic seal for steering shaft |
When replacing the 4699.172.122, it is recommended to also inspect the 4699008051 GK16 gear kit for wear, as these components share hydraulic load paths. The 4699101181 HOUSING must be free of cracks to ensure proper alignment, while the 4699102193 INPUT and 4699103131 OUTPUT shafts should be checked for spline wear during installation.
