Overview
The ZF 4651.056.020 is a precision-engineered component designed specifically for the WG 110 series transmission. This OEM genuine part plays a critical role in managing hydraulic fluid flow within the valve body assembly, ensuring consistent clutch engagement and smooth gear shifts under heavy load. The SKU 4651.056.020 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in industrial drivelines. When installed alongside the TRANSMISSION HOUSING (4651101013), it maintains the structural integrity required for high-torque applications.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn 4651.056.020 can cause hesitation when shifting from neutral to drive, often accompanied by a noticeable clunk.
- Intermittent slipping under load: Operators may experience power loss during acceleration, particularly when climbing grades or carrying heavy payloads.
- Hydraulic fluid seepage: Degraded seals around this part lead to visible oil leaks near the valve body area, often mistaken for a failing O-RING (0634303928).
- Erratic shift patterns: The transmission may skip gears or fail to hold a selected gear, indicating internal pressure loss.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.056.020 |
| Material | Hardened steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 95 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4651.056.020 |
| Operating Pressure | 12–18 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This genuine part is primarily engineered for the ZF WG 110 series transmission. It is also compatible with the WG 180 and WG 200 series when used in conjunction with the correct HOUSING (4651301032) and HOUSING (4651301033) assemblies. Always verify your transmission model code before installation, as variations in valve body configurations may require additional adapters.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Encloses gear train and supports bearing alignment |
| 4651301032 | HOUSING | Contains valve body and hydraulic passages |
| 0634303928 | O-RING | Seals fluid connections to prevent leaks |
| 4651301033 | HOUSING | Secondary housing for auxiliary pump drive |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary filtration for high-pressure circuits |
| 0636101032 | CAP SCREW | Secures housing flanges with precise torque |
| 0630361028 | SEALING CAP | Protects unused ports from contamination |
| 4475280060 | SCREW PLUG | Closes threaded openings in the valve body |
| 0634303312 | O-RING | Provides seal for screw plug and cap interfaces |
Frequently Asked Questions
Q: Can the 4651.056.020 be used in a ZF WG 180 transmission?
A: Yes, but only if the transmission is equipped with the correct HOUSING (4651301032) and HOUSING (4651301033). Always cross-reference your existing part numbers before ordering.
Q: What is the typical lifespan of this part?
A: Under normal operating conditions with regular fluid changes, the 4651.056.020 can last 300,000–500,000 km. Failure often accelerates if the O-RING (0634303928) is not replaced simultaneously.
Q: Does this part require special tools for installation?
A: Standard socket and torque wrench tools are sufficient. Ensure the TRANSMISSION HOUSING (4651101013) mating surface is clean to avoid misalignment.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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