Overview
The ZF 4644.183.113 is a precision-engineered OEM genuine component specifically designed for the WG 158 Series transmission. This part serves as a critical hydraulic control element within the valve body assembly, regulating fluid pressure to ensure smooth clutch engagement and gear shifts. As an integral part of the transmission’s modulation system, the 4644.183.113 works in concert with the TRANSMISSION HOUSING to maintain consistent oil flow. The SKU 4644.183.113 is manufactured to ZF’s exacting tolerances, guaranteeing a direct replacement that restores original shift quality and extends service life.
Symptoms of Failure
When the ZF 4644.183.113 begins to wear, operators may notice several distinct performance issues. Delayed or harsh shifting is a primary indicator, often described as a “clunk” when moving between forward and reverse gears. Intermittent gear slippage under load can occur, particularly during uphill climbs or heavy hauling, as internal pressure regulation fails. Visible oil leaks around the valve body area are another common symptom, often accompanied by a drop in transmission fluid level. Finally, erratic shift patterns—where the transmission hunts for gears or fails to hold a gear—point directly to a failing 4644.183.113 component.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.183.113 |
| OEM Reference | ZF WG 158 Series |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 95 mm x 45 mm x 35 mm |
| Operating Pressure | 12–18 bar |
| Seal Type | Nitrile Rubber (NBR) |
Compatibility
This genuine ZF 4644.183.113 part is primarily designed for the WG 158 Series transmission. It is also compatible with the WG 180 and WG 200 series transmissions used in medium-duty commercial vehicles and construction equipment. The part interfaces directly with the SHIFT SYSTEM and the GEAR SHIFT HOUSING to ensure precise gear selection. For proper installation, the SCREW-IN SLEEVE must be torqued to factory specifications to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101190 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4644159347 | SHIFT SYSTEM | Controls gear selection and shift timing |
| 4475280036 | SCREW-IN SLEEVE | Secures hydraulic lines and prevents fluid leaks |
| 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 piston bore against pressure loss |
| 0730006345 | RING | Provides secondary sealing for high-pressure circuits |
| 0730006346 | RING | Prevents cross-contamination between oil galleries |
| 0730006347 | RING | Maintains pressure integrity in the valve body |
Frequently Asked Questions
Q: How do I know if the 4644.183.113 is the correct replacement for my WG158 transmission?
A: Verify your transmission model number on the data plate. The 4644.183.113 is specifically calibrated for the WG 158 series and will not function correctly in earlier ZF models without modification.
Q: Can I replace the 4644.183.113 without removing the transmission?
A: Yes, this part is accessible after draining the fluid and removing the valve body cover. However, we recommend replacing the RING (0730006344) and RING (0730006345) simultaneously to ensure a complete seal.
Q: What is the typical lifespan of this part under normal operating conditions?
A: With proper fluid maintenance and filter changes every 500 hours, the 4644.183.113 typically lasts 4,000–6,000 operating hours before showing signs of wear.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
