Overview
This OEM genuine ZF 4656.172.063 component is a critical internal seal and guide element engineered specifically for the WG 160 Series transmission. Positioned within the valve body and hydraulic control assembly, this part ensures precise oil flow regulation and maintains correct pressure tolerances during gear shifts. The SKU 4656.172.063 interfaces directly with the main housing to prevent cross-contamination between hydraulic circuits. When installed alongside the TRANSMISSION HOUSING, it forms a sealed channel that directs lubrication to planetary gear sets and clutch packs.
Symptoms of Failure
- Erratic shift timing and delayed engagement — Worn 4656.172.063 components cause inconsistent hydraulic pressure, leading to hesitation when shifting from neutral to drive or reverse.
- Oil seepage around the valve body mating surface — Deterioration of this OEM part creates external fluid leaks, often visible as drips near the transmission pan rail.
- Intermittent gear slipping under load — As the part loses dimensional integrity, internal bypass occurs, causing the transmission to momentarily lose torque transfer during acceleration.
- Elevated operating temperature — Restricted fluid passages from a failing 4656.172.063 force the transmission to run hotter than normal, triggering warning lights on heavy-duty equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.172.063 |
| Material | Hardened steel with nitrile sealing lip |
| Outer Diameter | 38.5 mm |
| Inner Diameter | 22.0 mm |
| Height | 14.2 mm |
| Weight | 0.085 kg |
| Operating Pressure Range | 8–18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4656.172.063 is primarily designed for the WG 160 Series transmission family. It is also compatible with the WG 180 and WG 200 models when used in conjunction with the correct HOUS.FRONT SECT and HOUSING REAR PART. For WG 250 variants, verify fitment with the HOUSING REAR SECTION before installation. The part is not suitable for ZF 4HP or 5HP passenger car transmissions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101077 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201102 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4656201103 | HOUSING REAR PART | Rear casing for output shaft support |
| 4656298063 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0750301002 | FIXING PLATE | Retention bracket for valve body |
| 0636100817 | CAP SCREW | M8 fastener for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil pickup |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M6 bolt for cover plate retention |
Frequently Asked Questions
Q: Can I use the ZF 4656.172.063 in a WG 180 transmission without modifying the housing?
A: Yes, this part is a direct fit for WG 180 models when paired with the correct HOUS.FRONT SECT. No machining or adapter plates are required.
Q: How do I know if my 4656.172.063 has failed internally?
A: Look for metallic debris in the transmission pan during oil changes, combined with erratic shift patterns. A pressure test at the valve body test port will show readings below 8 bar at idle if this part is worn.
Q: Is the 4656.172.063 interchangeable with aftermarket alternatives?
A: We strongly recommend using only OEM genuine parts. Aftermarket versions often use inferior elastomers that degrade faster under high heat, leading to premature failure of the TRANSMISSION HOUSING sealing surfaces.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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