Overview
The ZF 4108.121.018 FILTER is a critical component engineered specifically for the lubrication and hydraulic circuits within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part ensures that transmission fluid remains free of particulate contaminants, which is essential for maintaining precise valve body operation and clutch pack engagement. As a primary barrier against debris, the 4108.121.018 filter sits within the transmission sump or housing assembly, directly upstream of the oil pump. Regular replacement of this filter, identified by SKU 4108.121.018, is a cornerstone of preventative maintenance for any WG-series gearbox.
Symptoms of Failure
- Erratic gear engagement or slipping: A clogged 4108.121.018 filter restricts oil flow, causing low line pressure that leads to delayed or harsh shifting.
- Whining or humming noise from the transmission: As the filter becomes obstructed, the pump works harder to draw fluid, generating audible cavitation or whining sounds during operation.
- Overheating transmission fluid: Restricted flow reduces the system’s ability to dissipate heat, resulting in elevated operating temperatures that can damage seals and clutches.
- Visible debris in the oil pan: If the filter media has ruptured or bypassed, metallic or friction material particles may be found in the fluid, indicating internal wear.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4108.121.018 |
| Filter Type | Spin-on / Cartridge (In-Line) |
| Filtration Micron Rating | 25-40 µm (nominal) |
| Outer Diameter | 95 mm |
| Height | 145 mm |
| Thread Size | M22 x 1.5 |
| Housing Material | Steel with anti-corrosion coating |
| Filter Media | Cellulose / Synthetic blend |
| Dry Weight | 0.45 kg |
| Bypass Valve Setting | 1.5 bar |
Compatibility
This filter is a direct OE replacement for the following ZF transmission models: WG100, WG130, and WG131. It is also commonly used in select WG180 and WG200 series transmissions where the same filter head and housing configuration is present. Always verify the filter head casting number to confirm fitment. The filter interfaces directly with the 4108101112: HOUSING and the 4108201177: HOUSING assemblies. During installation, ensure the 0636302056: SCREW PLUG is torqued correctly to prevent leaks, and inspect the 4108301304: BEARING COVER for wear if the filter has been severely clogged.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Encloses the filter element and directs oil flow. |
| 4108201177 | HOUSING | Secondary housing for filter or valve body mounting. |
| 0636302056 | SCREW PLUG | Seals the filter housing drain or pressure port. |
| 4108301304 | BEARING COVER | Protects output shaft bearing from contamination. |
| 4108306173 | GASKET | Provides a leak-proof seal between mating surfaces. |
| 0750110040 | SHAFT SEAL | Prevents fluid leakage along rotating shafts. |
| 4108102042 | INPUT | Transfers torque from the engine to the gearset. |
| 4108302099 | PLANET CARRIER | Holds planetary gears for torque multiplication. |
| 4108302007 | BEARINGSHEET | Thrust washer or bearing shim for axial play control. |
| 0635332196 | BALL BEARING | Supports rotating shafts with low friction. |
ZF 4108.121.018 FILTER – Filter RFQ Support
Use ZF 4108.121.018 FILTER as the reference number when requesting filter support. PartsZF can coordinate documentation checks and export RFQ preparation.
Part-Number Summary
Use ZF number 4108.121.018 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: FILTER
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4108.121.018 |
|---|---|
| Normalized SKU | 4108121018 |
| Part name | FILTER |
| Product category | filter |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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