Overview
The ZF 4656.101.079 is a precision-engineered OEM genuine component specifically designed for the WG 160 series transmission. This part functions as a critical sealing and alignment element within the hydraulic control unit, ensuring proper oil pressure regulation and smooth gear engagement. The SKU 4656.101.079 sits directly in the valve body assembly, where it interfaces with the main control bore to prevent cross-port leakage and maintain consistent clutch pack application. As a genuine ZF part, it guarantees exact dimensional tolerances and material composition required for long-term reliability in heavy-duty commercial vehicle applications.
Symptoms of Failure
- Delayed or harsh shifting: When the 4656.101.079 wears, internal leakage causes erratic clutch engagement, leading to noticeable shift shock or hesitation between gears.
- Transmission fluid seepage around the valve body: A degraded seal from this part often results in visible oil drips or wet spots on the transmission housing, particularly near the control module.
- Intermittent gear slipping under load: Worn tolerances in this component can cause pressure loss during torque converter lockup, making the transmission slip when climbing grades or hauling heavy loads.
- Erratic neutral-to-drive engagement: A failing 4656.101.079 may produce a delayed or incomplete engagement when shifting from neutral into forward or reverse, often accompanied by a momentary loss of hydraulic pressure.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.101.079 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Outer Diameter | 42.5 mm |
| Inner Diameter | 28.0 mm |
| Height | 18.2 mm |
| OEM Reference | ZF 4656.101.079 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4656.101.079 is primarily engineered for the WG 160 series transmission, which is widely used in municipal buses, refuse trucks, and medium-duty construction vehicles. It is also compatible with the WG 180 and WG 200 series transmissions that share the same valve body architecture. For proper installation, this part must be used alongside the 4656201102: HOUS.FRONT SECT which provides the mounting bore, and the 0631306816: CYLINDRICAL PIN for precise alignment. The assembly is secured using the 0750301002: FIXING PLATE and 0636100817: CAP SCREW to ensure vibration-proof fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201102 | HOUS.FRONT SECT | Front housing section providing mounting bore for control components |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise positioning of valve body elements |
| 0750301002 | FIXING PLATE | Retaining plate to secure internal assemblies against movement |
| 0636100817 | CAP SCREW | Fastener for attaching fixing plate to transmission housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris protection |
| 4656301017 | SCREEN SHEET | Secondary filter screen for high-pressure oil circuits |
| 0636100803 | CAP SCREW | M8 cap screw for valve body cover attachment |
| 0750301003 | OIL FEED.HOUSG. | Oil feed housing directing lubricant to clutch packs |
| 0736300233 | TORX SCREW | Torx-head screw for high-torque fastening applications |
| 4656301023 | GASKET | Sealing gasket for oil pan or valve body interface |
Frequently Asked Questions
Q: Can the 4656.101.079 be reused after removal?
No. This is a single-use precision component. Once installed and torqued, the material deforms slightly to create a proper seal. Reusing it will likely cause internal leakage and shift quality issues.
Q: How do I know if my WG160 needs this specific part?
If you are experiencing the failure symptoms listed above—particularly fluid seepage near the valve body or erratic shifting—and have already inspected the 4656301023: GASKET, the 4656.101.079 is the next likely culprit. Always verify with a ZF service manual for your exact transmission serial number.
Q: What tools are required for installation?
Standard metric socket set, torque wrench (range 8-25 Nm), and a soft-faced mallet. You will also need the 0636100803: CAP SCREW and 0736300233: TORX SCREW if replacing the entire valve body assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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