Overview
The ZF 4657.230.019 is a precision-engineered OEM genuine component specifically designed for the WG 158 series transmission. This part functions as a critical hydraulic control element, regulating oil flow within the valve body assembly to ensure smooth gear engagement and consistent clutch application. As a direct replacement for the original factory-installed unit, the SKU 4657.230.019 restores transmission shift quality and prevents internal pressure loss. It sits within the main control module, interfacing directly with the 4656201016: HOUS.FRONT SECT and the 4656301142: OIL TUBE to maintain proper lubrication pathways.
Symptoms of Failure
- Delayed or harsh shifting: When the 4657.230.019 wears, hydraulic pressure drops, causing noticeable hesitation between gears or abrupt engagement during acceleration.
- Transmission fluid leaks near the valve body: A worn sealing surface on this part allows ATF to seep past, often pooling under the bell housing or around the pan gasket.
- Erratic gear hunting on inclines: Inconsistent oil flow from a failing unit triggers random upshifts and downshifts, especially under load or during hill climbs.
- Overheating due to insufficient lubrication: Reduced fluid circulation through the 0631306816: CYLINDRICAL PIN and 4656301148: FIXING PLATE can elevate operating temperatures, accelerating internal wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4657.230.019 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 145 mm x 68 mm x 52 mm |
| OEM Reference | ZF 4657.230.019 (Genuine) |
| Seal Type | Nitrile rubber O-ring (integrated) |
| Operating Pressure Range | 8–18 bar (116–261 psi) |
Compatibility
This genuine ZF part is engineered primarily for the WG 158 series transmissions found in medium-duty commercial vehicles and off-highway equipment. It is also compatible with the WG 180 and WG 200 series, provided the valve body configuration matches. The 4657.230.019 replaces earlier revision numbers and is backward-compatible with select WG 150 variants. Always verify your transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201016 | HOUS.FRONT SECT | Front housing section that encloses the valve body assembly |
| 4656301142 | OIL TUBE | Routes pressurized fluid between valve body and clutch packs |
| 0631306816 | CYLINDRICAL PIN | Aligns and secures internal components within the housing |
| 4656301148 | FIXING PLATE | Retains oil tubes and prevents vibration-induced loosening |
| 0636102489 | CAP SCREW | Fastens valve body cover to main housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting valve body from debris |
| 4656301017 | SCREEN SHEET | Secondary filter for high-pressure circuits |
| 0636100803 | CAP SCREW | M6 bolt for securing oil feed components |
| 0750301003 | OIL FEED.HOUSG. | Housing that directs fluid from pump to valve body |
| 0736300233 | TORX SCREW | Tamper-resistant fastener for valve body retention |
Frequently Asked Questions
Q: How do I know if the 4657.230.019 is the correct replacement for my WG 158 transmission?
A: Check the stamped part number on your existing valve body component. If it matches 4657.230.019, this is the direct OEM replacement. For WG 180 or WG 200 units, compare the mounting hole pattern and seal groove dimensions.
Q: Can I replace this part without removing the entire transmission?
A: Yes, in most cases. The 4657.230.019 is accessible after dropping the transmission oil pan and removing the valve body cover. However, you must also inspect the 4656301142: OIL TUBE and 4656301148: FIXING PLATE for wear during the same service.
Q: What torque specification should I use for the retaining bolts?
A: Tighten the cap screws (such as 0636102489) to 12 Nm (106 in-lbs) in a crisscross pattern. Over-torquing can distort the valve body and cause internal binding.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
