Overview
The ZF 4651.301.029 HOUSING is a critical structural component designed for the WG 100 and WG 110 transmission series. This OEM genuine part serves as the primary enclosure for the hydraulic control unit and valve body assembly, ensuring precise alignment of internal components under high-pressure operating conditions. The housing (SKU: 4651.301.029) channels transmission fluid to critical lubrication points while protecting sensitive internal parts from external contaminants. When replacing this unit, it is common practice to also inspect the 4651101007: TRANSMISSION HOUSING for wear, as both components share a sealed interface.
Symptoms of Failure
- External hydraulic fluid seepage: Cracks or porosity in the housing casting often cause slow oil leaks around the valve body mating surface, visible as dark residue on the transmission casing.
- Erratic shift timing or gear slippage: Warpage in the housing face disrupts valve body alignment, leading to inconsistent clutch pack engagement during acceleration.
- Contaminated transmission fluid: A compromised housing allows debris ingress through hairline fractures, which accelerates wear on the 0634303928: O-RING seals and internal screens.
- Abnormal hydraulic noise: Distorted oil passages within the housing create cavitation sounds (whining or humming) during torque converter lockup.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4651.301.029 |
| Material | Die-cast aluminum alloy (A380) |
| Overall Length | 412 mm |
| Overall Width | 198 mm |
| Overall Height | 87 mm |
| Dry Weight | 3.2 kg (7.1 lbs) |
| Bolt Hole Pattern | 6x M10 x 1.5 on 145 mm PCD |
| Fluid Passage Count | 8 primary channels |
| Max Operating Pressure | 18 bar (261 psi) |
Compatibility
This housing is engineered specifically for the ZF WG 100 and WG 110 series transmissions, commonly found in medium-duty trucks and construction equipment. While the 4651.301.029 is not directly compatible with WG 180 or WG 200 models due to different bolt patterns, the 4651301024: HOUSING variant serves those larger platforms. For optimal fluid filtration, always pair this housing with a fresh 4651203002: SCREEN SHEET during rebuilds.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0634303928 | O-RING | Seals housing-to-valve body interface |
| 4651301024 | HOUSING | Rear cover housing for WG 180/200 |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4651303005 | SCREEN SHEET | Coarse debris screen for oil sump |
| 0636101032 | CAP SCREW | M10 fasteners for housing assembly |
| 0630361028 | SEALING CAP | Plugs unused fluid ports |
| 4475280060 | SCREW PLUG | Magnetic drain plug for housing |
| 0634303312 | O-RING | Seals for screen sheet cavity |
| 4645301027 | BRACKET | Mounting bracket for shift linkage |
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