Overview
The ZF 4644.130.298 is a precision-engineered OEM genuine component designed specifically for the WG 158 series transmission. This part functions as a critical hydraulic control element within the valve body assembly, regulating oil flow to ensure smooth clutch engagement and proper gear ratio selection. As an original ZF part, the SKU 4644.130.298 guarantees exact fitment and factory-specified tolerances, eliminating the guesswork associated with aftermarket alternatives. It sits directly within the main control unit of the transmission, working in concert with the 4644101190: TRANSMISSION HOUSING to maintain consistent hydraulic pressure across all operating conditions.
Symptoms of Failure
When the ZF 4644.130.298 begins to wear, operators typically notice three distinct failure modes. First, delayed or harsh gear engagement becomes apparent, especially when shifting from neutral into drive or reverse. Second, intermittent transmission slipping under load occurs as internal leakage disrupts clutch pack pressure. Third, erratic shift timing develops, where the transmission either upshifts too early or holds gears too long. These symptoms often accompany degraded performance in the 4644159347: SHIFT SYSTEM, as both components share hydraulic circuits. Left unaddressed, these issues can lead to complete transmission failure and costly rebuilds.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.130.298 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Length | 85 mm |
| Outer Diameter | 32 mm |
| Operating Pressure Range | 8–18 bar |
| Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 158 Series |
Compatibility
This genuine ZF 4644.130.298 component is primarily designed for the WG 158 transmission series. It also shares compatibility with the WG 180 and WG 200 series transmissions produced after 2015, where hydraulic control architecture remains consistent. For applications involving the 4475280036: SCREW-IN SLEEVE or the 4644306511: GEAR SHIFT HOUSING, always verify that the valve body revision matches your unit. Cross-reference with your transmission serial number to ensure correct fitment, as minor design changes occurred during the 2018 production update.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101190 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4644159347 | SHIFT SYSTEM | Controls gear selection and hydraulic routing |
| 4475280036 | SCREW-IN SLEEVE | Provides sealed connection for hydraulic lines |
| 4644306511 | GEAR SHIFT HOUSING | Houses shift forks and selector mechanisms |
| 4644306440 | PISTON | Converts hydraulic pressure into mechanical force |
| 0635470104 | ROLLER | Reduces friction in shift rail movement |
| 0730006344 | RING | Seals hydraulic passages against leakage |
| 0730006345 | RING | Provides secondary sealing in valve body |
| 0730006346 | RING | Maintains pressure integrity under high load |
| 0730006347 | RING | Prevents cross-contamination between circuits |
Frequently Asked Questions
Q: Can the ZF 4644.130.298 be replaced without removing the entire transmission?
A: Yes, in most WG 158 applications, this component is accessible after draining the fluid and removing the valve body cover. However, access may require prior removal of the 4644306511: GEAR SHIFT HOUSING for clearance.
Q: How often should the 4644.130.298 be inspected during routine maintenance?
A: ZF recommends inspection every 500 operating hours or during any major transmission service. Look for scoring on the sealing surfaces and check for free movement within the bore.
Q: Will a failed 4644.130.298 damage other transmission components?
A: Absolutely. A worn unit can send metallic debris through the hydraulic system, potentially damaging the 4644159347: SHIFT SYSTEM and clutch packs. Prompt replacement is critical to avoid cascading failures.
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Phone: +86 158 2286 3467 |
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