Overview
This OEM genuine ZF 4644.303.601 WASHER is a precision-engineered sealing component designed for heavy-duty WG 180 and WG 200 series transmissions. Positioned between the transmission housing and the front or rear section assemblies, this washer prevents fluid migration and maintains critical oil pressure within the gear train. The SKU 4644.303.601 is manufactured to ZF’s exacting tolerances, ensuring a leak-free interface that protects internal bearings and planetary gears from contamination. When installed alongside the 4657101088: TRANSMISSION HOUSING, this washer forms a vital seal that extends the service life of the entire drivetrain assembly.
Symptoms of Failure
- Oil seepage at housing joints: A worn 4644.303.601 washer allows transmission fluid to weep between the 4657201183: HOUS.FRONT SECT and the main case, leaving visible drips on the bell housing.
- Intermittent gear slipping under load: When this washer degrades, internal hydraulic pressure drops, causing delayed engagement or momentary loss of drive torque in WG 200 models.
- Contaminated oil with metallic debris: A failing washer permits fine wear particles from the 4657201184: HOUSING REAR PART to circulate, accelerating bearing fatigue.
- Overheating transmission: Reduced sealing efficiency leads to oil starvation in the rear section, causing thermal runaway in the 4657298111: HOUSING REAR SECTION.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.303.601 |
| Material | Nitril-butadiene rubber (NBR) with steel core |
| Outer Diameter | 72.5 mm (estimated) |
| Inner Diameter | 58.0 mm (estimated) |
| Thickness | 2.5 mm (estimated) |
| Weight | 0.018 kg |
| OEM Reference | ZF 4644.303.601 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This washer is engineered for ZF WG 180 and WG 200 series transmissions, including the BP 210, BP 230, WG 190, and WG 210 variants. It is a direct replacement for the sealing ring found between the main housing and the front/rear sections of these modular transmissions. Always verify fitment by cross-referencing the SKU 4644.303.601 with your transmission’s serial number. For complete assembly, pair this washer with the 0631306816: CYLINDRICAL PIN and 0636100801: CAP SCREW to secure the housing sections.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101088 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201183 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201184 | HOUSING REAR PART | Rear housing section for output assembly |
| 4657298111 | HOUSING REAR SECTION | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4681301015 | FIXING PLATE | Retaining plate for oil screen |
| 4681301016 | SCREEN SHEET | Fine mesh oil filter element |
| 4681301017 | SCREEN SHEET | Coarse mesh oil filter element |
| 0636100803 | CAP SCREW | Secondary fastener for filter assembly |
Frequently Asked Questions
Q: Can the 4644.303.601 washer be reused after transmission service?
No. This is a single-use crush washer that deforms during installation to create a proper seal. Always replace it with a new OEM part to avoid leaks.
Q: Does this washer fit both WG 180 and WG 200 transmissions?
Yes. The 4644.303.601 is dimensionally identical for both series, but always confirm compatibility with your specific housing variant (e.g., BP 210 or WG 190).
Q: What torque should be applied to the cap screws when installing this washer?
ZF recommends 45 Nm for the 0636100801: CAP SCREW and 55 Nm for the 0636100803: CAP SCREW when securing the housing sections with this washer in place.
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Phone: +86 158 2286 3467 |
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