Overview
The ZF 4651.301.025 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 SKU 4651.301.025 interfaces directly with the main 4651101009: TRANSMISSION HOUSING to create a sealed environment that channels transmission fluid flow. Manufactured from high-strength cast alloy, this housing maintains dimensional stability during thermal cycling, preventing distortion that could compromise shift quality in heavy-duty industrial applications.
Symptoms of Failure
- External fluid seepage at the housing mating surface: When the 4651.301.025 housing warps or develops micro-fractures, operators often notice oil weeping around the bolt flange, particularly after extended high-torque operation.
- Erratic gear engagement under load: A compromised housing can misalign the valve body, causing delayed or harsh shifts when the transmission reaches operating temperature.
- Contaminated transmission fluid with metallic debris: Internal cracking of the housing bore allows wear particles from the clutch packs to bypass the 4651203002: SCREEN SHEET, leading to accelerated component degradation.
- Audible hydraulic whine during gear changes: Distortion in the housing channels disrupts fluid pressure pathways, producing a distinct high-pitched noise that worsens with load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.301.025 |
| Material | High-grade cast aluminum alloy (A356-T6) |
| Overall Dimensions | 320 mm x 210 mm x 95 mm |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4651.301.025 |
| Bolt Torque Specification | 45 Nm ± 5 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This housing is engineered specifically for the ZF WG 100 and WG 110 series transmissions, commonly found in forklifts, telehandlers, and industrial loaders. While the 4651.301.025 is not directly compatible with WG 180 or WG 200 models due to different bolt patterns and fluid gallery configurations, it shares mounting interfaces with the 4651301031: HOUSING used in earlier WG 80 variants. Always verify the casting number on your existing housing before replacement. For complete assembly, this part must be paired with the 0634303928: O-RING to ensure a leak-proof seal against the main transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Main structural case for gear train |
| 0634303928 | O-RING | Seals housing-to-case interface |
| 4651301031 | HOUSING | Secondary cover for valve body access |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 0636101032 | CAP SCREW | Fastener for housing mounting |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports |
| 4475280060 | SCREW PLUG | Seals threaded oil passages |
| 0634303312 | O-RING | Gasket for pressure line connections |
| 4645301027 | BRACKET | Mounting support for shift linkage |
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