Overview
The ZF 0501.210.925 FILTER HEAD is a critical hydraulic component designed for the WG 110 series transmission. This OEM genuine part serves as the mounting interface and fluid distribution hub for the main oil filter assembly, ensuring that transmission fluid is properly filtered before circulating through the valve body and clutch packs. The SKU 0501.210.925 is precision-machined to maintain correct oil pressure and flow rates, directly impacting shift quality and thermal regulation. When installed alongside the TRANSMISSION HOUSING and the HOUSING, this filter head creates a sealed filtration circuit that protects internal components from particulate contamination.
Symptoms of Failure
- External oil seepage at the filter head gasket: A worn 0501.210.925 often develops cracks or corrosion around the mounting flange, leading to visible fluid drips beneath the transmission bell housing.
- Erratic shift timing or delayed engagement: When the filter head loses its sealing integrity, air ingestion occurs, causing inconsistent hydraulic pressure and harsh gear changes during acceleration.
- Elevated transmission operating temperature: A compromised filter head restricts oil flow, forcing the transmission to run hotter than normal, which accelerates wear on the O-RING and adjacent seals.
- Whining noise from the pump area: Reduced oil volume due to filter head leakage creates cavitation in the hydraulic circuit, producing a high-pitched sound that intensifies under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.210.925 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Dimensions (L x W x H) | 180 mm x 95 mm x 65 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 0501.210.925 (Genuine) |
| Thread Size (Inlet/Outlet) | M22 x 1.5 |
| Max Operating Pressure | 18 bar (261 psi) |
| Temperature Range | -40°C to +120°C |
Compatibility
This filter head is engineered for the ZF WG 110 series transmission family. It is also compatible with the WG 120, WG 150, and WG 180 models that share the same hydraulic filtration architecture. For proper installation, verify that the HOUSING and all sealing surfaces are free of debris. The 0501.210.925 is not backward-compatible with older WG 80 or WG 100 variants without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4651301032 | HOUSING | Secondary housing for valve body support |
| 0634303928 | O-RING | Seal between filter head and housing |
| 4651301033 | HOUSING | Alternate housing variant for WG 110 |
| 4651203002 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4651303005 | SCREEN SHEET | Secondary filter screen for bypass circuit |
| 0636101032 | CAP SCREW | Fastener for filter head mounting |
| 0630361028 | SEALING CAP | Protective cap for unused ports |
| 4475280060 | SCREW PLUG | Threaded plug for pressure test port |
| 0634303312 | O-RING | Seal for screw plug connection |
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