Overview
The ZF 4656.006.019 is an OEM genuine component engineered specifically for the WG 115 series transmission. This precision-machined part serves as a critical interface within the hydraulic control circuit, regulating fluid flow to ensure consistent clutch engagement and torque converter lock-up. Positioned between the valve body and the main housing, the 4656.006.019 directly influences shift quality and overall driveline efficiency. When paired with a robust TRANSMISSION HOUSING, this component maintains the structural integrity required for heavy-duty industrial applications. The SKU 4656.006.019 is manufactured to ZF’s exacting tolerances, ensuring a direct replacement without modification.
Symptoms of Failure
- Delayed or harsh shifting — Worn internal bores cause pressure loss, leading to erratic gear engagement. This is a common “ZF WG115 hard shifting” issue.
- Transmission fluid seepage — Cracks or gasket surface degradation around the 4656.006.019 produce visible oil leaks at the housing joint, often mistaken for a main seal failure.
- Intermittent gear slip under load — When the part loses its sealing capability, hydraulic pressure drops during torque multiplication, causing the transmission to momentarily lose drive.
- Contaminated fluid circulation — Internal debris from a failing 4656.006.019 can bypass the filter, accelerating wear on adjacent components like the HOUS.FRONT SECT.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.006.019 |
| Material | High-grade aluminum alloy (A356-T6) |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Length | 142 mm |
| Bolt Hole Pattern | 6x M8 on 95 mm PCD |
| Sealing Surface Finish | Ra 0.8 µm |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4656.006.019 (Genuine) |
Compatibility
This genuine ZF part is designed for the WG 115 series, but its hydraulic control function also makes it applicable to the WG 180 and WG 200 models when used in conjunction with the correct HOUSING REAR PART. It is not compatible with the earlier WG 80 series without adapter modifications. For installations requiring a different rear cover configuration, the HOUSING REAR PART (4472239178) offers an alternative mounting interface. Always verify the transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4656201035 | HOUSING REAR PART | Rear cover for output shaft support |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | M8 x 25 mm fastener for housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter variant |
| 0636100803 | CAP SCREW | M6 x 20 mm fastener for cover plates |
Frequently Asked Questions
Q: Can the 4656.006.019 be reused if it shows no visible damage?
A: No. ZF recommends replacing this hydraulic control component whenever the transmission is overhauled, as microscopic wear on the sealing lands can cause pressure loss even without visible cracks.
Q: Does this part require special tools for installation?
A: Yes. A torque wrench calibrated to 28 Nm is essential for the six M8 bolts. Additionally, a seal installer tool is recommended to avoid damaging the O-ring groove when mating with the HOUS.FRONT SECT.
Q: How does the 4656.006.019 differ from the 4656.006.018 variant?
A: The .019 revision features an enlarged oil return port for improved cooling flow in high-torque WG115 applications. The .018 variant lacks this port and is not interchangeable.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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