Overview
The ZF 4656.055.303 is a critical OEM genuine component designed specifically for the WG 160 series transmission. This precision-engineered part functions as a sealing and alignment element within the hydraulic control unit, ensuring proper fluid pressure regulation and gear engagement. The SKU 4656.055.303 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the integrity of the transmission’s internal oil circuits. When installed alongside the 4656201085: HOUS.FRONT SECT, this part creates a sealed chamber that directs oil flow to the clutch packs and valve body.
Symptoms of Failure
- Oil leaks around the front housing: A worn 4656.055.303 often causes visible transmission fluid seepage near the bell housing, particularly when paired with a degraded 0634313603: O-RING.
- Intermittent gear slipping under load: As the part loses its sealing capability, hydraulic pressure drops, leading to delayed engagement or slipping in higher gears.
- Erratic shift timing: A failing 4656.055.303 disrupts the oil feed to the valve body, causing harsh or delayed shifts that worsen as transmission temperature rises.
- Contaminated transmission fluid: Debris from a deteriorating part can circulate through the system, often requiring replacement of the 4656301016: SCREEN SHEET to prevent further damage.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4656.055.303 |
| Material | Hardened steel with nitrile coating |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Thickness | 12.7 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4656.055.303 |
| Seal Type | Static face seal |
Compatibility
This genuine ZF part is primarily designed for the WG 160 series, but it also fits select models in the WG 180 and WG 200 families when used with the correct 0636115293: 螺栓 and 0631306816: CYLINDRICAL PIN. Specific compatible transmissions include WG160-6, WG180-6, WG200-8, and WG160-8 variants manufactured after 2015. Always verify your transmission’s serial number against the ZF parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201085 | HOUS.FRONT SECT | Front housing section for clutch assembly |
| 0636115293 | 螺栓 | Mounting bolt for housing retention |
| 0634313603 | O-RING | Static seal for oil passageways |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise assembly |
| 4656301148 | FIXING PLATE | Retains screen sheet in position |
| 0636100817 | CAP SCREW | Fastener for valve body cover |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | Hex head screw for housing |
| 4656301047 | OIL FEED.HOUSG. | Oil feed housing for lubrication |
Frequently Asked Questions
Q: Can I use the ZF 4656.055.303 in a WG180 transmission?
A: Yes, this part is compatible with WG180 series transmissions when paired with the correct 0636115293: 螺栓 and 0631306816: CYLINDRICAL PIN. Always cross-reference your transmission’s serial number to confirm fitment.
Q: What causes premature failure of this part?
A: The most common causes are contaminated transmission fluid and improper torque on the 0636100817: CAP SCREW. Regular fluid changes and using OEM-specified fasteners extend service life significantly.
Q: Should I replace the O-ring and screen sheet at the same time?
A: Yes, ZF recommends replacing the 0634313603: O-RING and 4656301016: SCREEN SHEET whenever the 4656.055.303 is replaced to prevent debris contamination and ensure proper sealing.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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