Overview
The ZF 4644.309.074 is a critical OEM genuine component engineered specifically for the WG 100, WG 110, and WG 150 series transmissions. This part functions as a precision-machined internal guide and sealing element, positioned within the valve body or clutch housing assembly to regulate hydraulic fluid flow and maintain consistent pressure during gear shifts. The SKU 4644.309.074 ensures exact fitment and durability, reducing the risk of premature wear in high-torque applications. When installed alongside a robust TRANSMISSION HOUSING (4642101109), the assembly achieves optimal alignment and thermal stability.
Symptoms of Failure
- Delayed or harsh shifting: Worn 4644.309.074 components cause erratic hydraulic pressure, leading to noticeable lag or jarring engagement between gears.
- Internal fluid leaks: Degraded sealing surfaces allow transmission fluid to bypass, resulting in low fluid levels and visible drips under the vehicle.
- Overheating transmission: Inadequate pressure regulation forces the system to work harder, generating excessive heat that can damage internal seals and clutches.
- Intermittent gear slipping: As the part loses dimensional integrity, the transmission may momentarily lose power transfer under load, especially during uphill driving.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.309.074 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4644.309.074 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This genuine ZF part is designed for the WG 100, WG 110, and WG 150 transmission series. It is also compatible with the WG 180 and WG 200 models when used in conjunction with the correct TRANSMISSION HOUSING (4642301205). For proper identification, always verify the TYPE PLATE (0730365125) on your unit. Secure installation requires the GROOVED STUD (0631311009) to anchor the component firmly within the housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG180/WG200 series |
| 0730365125 | TYPE PLATE | Identification plate with transmission serial and model data |
| 0631311009 | GROOVED STUD | Threaded fastener for securing internal components |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris removal |
| 4642301169 | SCREEN SHEET | Secondary filter screen for high-flow circuits |
| 0636100621 | HEXAGON SCREW | Hex-head bolt for housing and cover plate attachment |
| 4642301186 | SCREEN SHEET | Replacement screen for WG150 series oil pans |
| 4644106300 | SHIFT SYSTEM | Complete shift fork and actuator assembly |
| 4644306500 | COVER PLATE | Sealing plate for valve body access port |
Frequently Asked Questions
Q: Can the 4644.309.074 be used in a WG180 transmission without modifications?
A: Yes, but only if you pair it with the correct TRANSMISSION HOUSING (4642301205). The part itself is dimensionally identical across WG100 through WG200 series, but housing variations affect sealing pressure.
Q: How do I confirm this part is genuine OEM?
A: Verify the part number 4644.309.074 on the TYPE PLATE (0730365125) of your transmission. Genuine ZF parts have a laser-etched serial number matching OEM records.
Q: What tools are needed for replacement?
A: Standard socket set, torque wrench, and a GROOVED STUD (0631311009) for alignment. Always replace the SCREEN SHEET (4642301168) simultaneously to prevent debris contamination.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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