Overview
The ZF 4651.056.017 is a critical OEM genuine component engineered specifically for the WG 110 Series transmission. This precision-machined part functions as a hydraulic control element, regulating oil flow and pressure within the valve body assembly to ensure smooth gear engagement and consistent torque delivery. The SKU 4651.056.017 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications. When installed alongside a robust TRANSMISSION HOUSING (4651101013), this component maintains the structural integrity required for high-load operations.
Symptoms of Failure
When the ZF 4651.056.017 begins to degrade, operators may notice delayed gear engagement during cold starts, a common long-tail search query for “ZF WG110 slow shifting.” Another frequent issue is intermittent oil pressure loss, which manifests as erratic shifting or shuddering under load. Worn seals within this part often cause external fluid seepage around the valve body area, leading to low transmission fluid levels. Finally, harsh upshifts or downshifts can occur as the part fails to modulate hydraulic pressure correctly, a symptom often searched as “ZF transmission harsh shifting fix.”
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.056.017 |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 145 mm x 85 mm x 40 mm |
| OEM Reference | ZF 4651.056.017 |
| Sealing Surface Finish | Ra 0.8 µm |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 110 Series transmission, commonly found in municipal trucks, construction loaders, and agricultural machinery. It is also compatible with the WG 180 and WG 200 series when used in conjunction with the correct HOUSING (4651301032) adapter kit. For optimal sealing, always pair this part with a new O-RING (0634303928) and verify the HOUSING (4651301033) alignment before installation. The 4651.056.017 is not backward-compatible with older WG 80 series transmissions without significant modification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4651301032 | HOUSING | Intermediate housing for valve body |
| 0634303928 | O-RING | Hydraulic seal between components |
| 4651301033 | HOUSING | Rear housing for clutch pack |
| 4651203002 | SCREEN SHEET | Filtration mesh for oil circuit |
| 4651303005 | SCREEN SHEET | Secondary oil strainer |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Protects hydraulic ports |
| 4475280060 | SCREW PLUG | Seals drain or test ports |
| 0634303312 | O-RING | Secondary seal for pressure lines |
Frequently Asked Questions
Q: Can the ZF 4651.056.017 be rebuilt, or must it be replaced?
A: This OEM genuine part is a precision hydraulic component. While some wear items like O-rings can be replaced, the core body is designed as a non-serviceable unit. Replacement with a new 4651.056.017 is strongly recommended to avoid internal leakage.
Q: How do I know if my WG110 transmission needs this specific part?
A: If you experience erratic shifting or fluid leaks near the valve body, inspect the 4651.056.017 for scoring or corrosion. A pressure test showing below-spec readings at the control port often confirms failure of this component.
Q: What torque specifications should I use when installing this part?
A: Always refer to the ZF service manual for your specific transmission model. Generally, the mounting bolts for the 4651.056.017 require 25 Nm (18 ft-lbs) when used with a new O-RING (0634303928). Over-torquing can distort the housing.
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