Overview
The ZF 4657.298.109 is an OEM genuine component engineered specifically for the WG115 and WG160 series transmissions. This precision-machined part functions as a critical interface element within the valve body or clutch housing assembly, regulating hydraulic flow and ensuring consistent pressure modulation during gear shifts. The SKU 4657.298.109 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial vehicle transmissions. When installed alongside the 4656201085: HOUS.FRONT SECT, it forms a sealed hydraulic circuit that prevents cross-contamination between oil galleries.
Symptoms of Failure
- Delayed or harsh shifting — When the 4657.298.109 wears, hydraulic pressure drops, causing noticeable lag between gear engagements or abrupt clutch applications.
- Transmission fluid seepage — Cracks or deformation in this part lead to external oil leaks around the housing mating surface, often mistaken for a simple gasket failure.
- Intermittent gear slippage under load — A failing unit cannot maintain steady pressure, resulting in momentary loss of torque transfer during uphill climbs or heavy hauling.
- Erratic neutral-to-drive engagement — Drivers may experience a delayed or incomplete shift from neutral to drive, especially after extended idle periods.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.298.109 |
| Material | High-grade aluminum alloy with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Dimensions | 120 mm x 85 mm x 45 mm |
| OEM Reference | ZF 4657.298.109 (Genuine) |
| Sealing Surface Finish | Ra 0.8 µm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This part is primarily designed for ZF WG115 and WG160 series transmissions found in medium-duty trucks, buses, and construction equipment. It also fits select WG180 and WG200 models where the valve body architecture shares identical mounting points. Always verify the 0631306816: CYLINDRICAL PIN alignment during installation, as improper seating can cause premature wear. For WG200 applications, the 4656301148: FIXING PLATE must be torqued to specification using the 0636100817: CAP SCREW to prevent vibration loosening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201085 | HOUS.FRONT SECT | Front housing section that encloses the valve body assembly |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise component positioning |
| 4656301148 | FIXING PLATE | Retaining plate that secures hydraulic passages |
| 0636100817 | CAP SCREW | High-tensile fastener for housing attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil debris protection |
| 4656301017 | SCREEN SHEET | Secondary filter screen for high-flow circuits |
| 0636100803 | CAP SCREW | M8 cap screw for valve body retention |
| 4656301047 | OIL FEED.HOUSG. | Oil feed housing that directs lubricant to clutches |
| 0736300233 | TORX SCREW | Tamper-resistant screw for cover plates |
| 4656301023 | GASKET | Sealing gasket for oil feed housing interface |
Frequently Asked Questions
Q: How do I know if the 4657.298.109 is the correct replacement for my WG160 transmission?
A: Check the stamped part number on your existing component. If it matches 4657.298.109, it is a direct OEM replacement. Additionally, verify that the 4656301023: GASKET is included in your rebuild kit to ensure a proper seal.
Q: Can this part be reused after a transmission overhaul?
A: ZF recommends replacing the 4657.298.109 during any major rebuild due to potential micro-cracking from thermal cycling. Reusing it risks the failure symptoms described above, particularly oil seepage and pressure loss.
Q: What torque specification should I use for the 0636100817: CAP SCREW when installing this part?
A: The standard torque for M8 cap screws in this assembly is 25 Nm (18.4 lb-ft) applied in a cross-pattern sequence. Always consult the ZF service manual for your specific transmission model.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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