Overview
The ZF 4699.172.107 STEERING PARTS component is a critical OEM genuine element within the steering control assembly of heavy-duty construction machinery transmissions. This precision-engineered part governs hydraulic flow modulation, directly influencing directional response and operator steering feel. As an integral sub-assembly, the 4699.172.107 interfaces with the main valve body to ensure smooth articulation under high-torque loads. When paired with a properly functioning 4699004120: GK25 II, this steering part maintains consistent pressure regulation. The SKU 4699.172.107 is specifically designed for ZF power shift transmissions used in wheel loaders and graders, where precise steering control is non-negotiable for operational safety.
Symptoms of Failure
- Erratic steering response or “jerky” wheel movement – Worn internal spools cause inconsistent hydraulic pressure, leading to unpredictable machine handling during low-speed maneuvers.
- Hydraulic oil seepage around the steering column base – Degraded seals in the 4699.172.107 assembly allow pressurized fluid to escape, often visible as drips near the transmission housing.
- Increased steering effort or “heavy” wheel feel – Internal corrosion or debris contamination restricts pilot flow, forcing operators to exert excessive force for directional changes.
- Intermittent loss of power steering assist – A failing steering part can cause momentary pressure drops, particularly when turning under load, mimicking a failing pump.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4699.172.107 |
| Component Type | Steering Control Valve Spool Assembly |
| Material | Hardened Alloy Steel (Nitrided) |
| Weight | 1.85 kg (4.08 lbs) |
| Overall Length | 142 mm |
| Max Operating Pressure | 250 bar (3,625 psi) |
| OEM Reference | ZF 4699.172.107 |
| Seal Type | PTFE with Viton Backup Rings |
Compatibility
This OEM genuine steering part is engineered for ZF WG-series transmissions commonly deployed in construction machinery. Based on the part’s hydraulic architecture, the 4699.172.107 is compatible with the following ZF models: WG180, WG200, and WG211. It also integrates into select ERGO-POWER steering systems used in telescopic handlers. For proper installation, ensure the 4699101124: HOUSING is free of burrs, and verify alignment with the 4699102168: INPUT shaft. The 4699103026: OUTPUT flange must also be torqued to factory specifications to prevent premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699004120 | GK25 II | Gearbox shift controller for clutch modulation |
| 4699101124 | HOUSING | Encloses steering valve assembly |
| 4699102168 | INPUT | Primary drive shaft for steering pump |
| 4699103026 | OUTPUT | Transfers steering torque to gearbox |
| 4699105107 | TURNTABLE BEARING | Supports rotational steering loads |
| 4699301209 | HOUSING | Secondary housing for steering linkage |
| 4699301015 | HOUSING COVER | Seals upper steering chamber |
| 4699301085 | COVER | Protects steering spool access port |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303980 | O-RING | Hydraulic seal for steering circuit |
