Overview
The ZF 4699.172.022 STEERING PARTS assembly is a precision-engineered component designed for the hydraulic steering circuit within ZF construction machinery transmissions. This OEM genuine part functions as a critical control element, directing fluid flow to modulate steering response in heavy-duty loaders and graders. The SKU 4699.172.022 is specifically calibrated to interface with the main valve body, ensuring proportional steering torque during low-speed maneuvers. It is mounted directly adjacent to the 4699101045: HOUSING, which provides the structural enclosure for the steering spool assembly. Without this component, the transmission’s steering circuit cannot maintain proper hydraulic pressure modulation.
Symptoms of Failure
- Intermittent steering hesitation during low-RPM operation — The part wears internally, causing delayed hydraulic response when maneuvering in tight construction zones.
- External hydraulic fluid seepage near the steering column interface — Degraded sealing surfaces allow oil to weep past the 0634301843: SHAFT SEAL, leaving visible residue on the transmission housing.
- Erratic self-centering behavior after turning — Worn internal lands fail to return the steering valve to neutral, requiring constant manual correction.
- Increased steering wheel free play exceeding 15 degrees — Internal clearances expand, creating a dead band before hydraulic engagement occurs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.172.022 |
| Material | Hardened alloy steel (42CrMo4) with nitrided surface |
| Weight | 0.84 kg (1.85 lbs) |
| Overall Length | 112 mm |
| Maximum Operating Pressure | 250 bar (3,625 psi) |
| OEM Reference | ZF 4699.172.022 |
| Sealing Interface | Compatible with 0634303141: O-RING |
| Thread Protection | Requires 4699301014: THREAD PROTECTIVE SHIELD |
Compatibility
This steering part is engineered for ZF WG-series powershift transmissions commonly found in construction machinery. Verified compatibility includes the WG180, WG200, and WG210 series. It also integrates with the ZF 4WG-200 and ZF 6WG-250 torque converter transmissions used in wheel loaders and backhoes. The part mounts between the 4699301108: HOUSING and the 4699301085: COVER, requiring removal of the 0734307407: PROTECTION CAP during installation. Always verify your transmission serial number against the ZF parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101045 | HOUSING | Encloses steering spool assembly |
| 4699301108 | HOUSING | Secondary valve body housing |
| 4699301085 | COVER | Seals the steering valve cavity |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303141 | O-RING | Static seal between mating surfaces |
| 0734307407 | PROTECTION CAP | Covers hydraulic port during transport |
| 0634301843 | SHAFT SEAL | Dynamic seal for rotating steering shaft |
| 0630502034 | RETAINING RING | Secures internal components axially |
| 0637885612 | BREATHER | Equalizes pressure in steering housing |
| 0636102023 | CAP SCREW | Fastens cover to housing |
