Overview
The ZF 4660.138.004 FILTER is a critical hydraulic filtration component engineered specifically for the WG 92 and WG 98 transmission series. Positioned within the oil sump or return line circuit, this genuine OEM part ensures that transmission fluid remains free of particulate contaminants, metal shavings, and clutch debris. By maintaining fluid cleanliness, the SKU 4660.138.004 directly protects valve bodies, torque converters, and planetary gear sets from premature wear. This filter is a direct replacement unit, designed to meet ZF’s original flow and micron-rating specifications for heavy-duty industrial applications.
Symptoms of Failure
When the 4660.138.004 filter becomes clogged or degraded, operators may notice several distinct performance issues. Delayed gear engagement is a primary symptom, as restricted oil flow prevents the transmission from building adequate hydraulic pressure quickly. Another common sign is erratic shifting or gear slipping under load, often accompanied by harsh or unpredictable shift points. Overheating transmission fluid frequently occurs because a blocked filter forces the pump to work harder, generating excess heat. Finally, visible metallic debris in the oil pan during routine maintenance indicates the filter has lost its ability to capture wear particles, allowing them to recirculate through the system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.138.004 |
| OEM Reference | ZF 4660.138.004 |
| Filtration Media | High-efficiency cellulose/synthetic blend |
| Micron Rating | 25 microns nominal |
| Overall Height | 185 mm (approx.) |
| Outer Diameter | 95 mm (approx.) |
| Thread Size | M22 x 1.5 (inlet) |
| Dry Weight | 0.45 kg (approx.) |
| Operating Temperature Range | -20°C to +120°C |
| Burst Pressure Rating | 20 bar minimum |
Compatibility
This filter is designed for use across multiple ZF transmission platforms. It is a direct fit for the WG 92 and WG 98 series, which are commonly found in medium-duty trucks, buses, and construction equipment. Additionally, the 4660.138.004 is compatible with the WG 180, WG 200, and WG 211 transmissions, provided the housing configuration matches. Always verify the filter head and mounting flange geometry before installation. For proper sealing, ensure the mating surface on the 4660101011: TRANSMISSION HOUSING is clean and undamaged. The filter integrates with the 4660301018: HOUSING assembly, which channels fluid flow. During installation, use a 0631306174: CYLINDRICAL PIN to align the filter correctly, and always reference the 0769123894: TYPE PLATE for the exact part number confirmation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101011 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4660301018 | HOUSING | Secondary housing for valve body or pump |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for component positioning |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 4660221012 | SUCTION TUBE | Fluid pickup tube from sump to pump |
| 0634100317 | O-RING | Seal for filter housing connection |
| 0636103273 | CAP SCREW | Fastener for securing filter cover |
| 0750100022 | SCREW PLUG | Drain or port plug for oil passages |
| 4660101804 | TRANSMISSION HOUSING | Alternate housing variant for specific models |
| 4660301008 | HOUSING | Alternate housing variant for filter mount |
ZF 4660.138.004 FILTER – Filter RFQ Support
PartsZF helps B2B buyers source ZF 4660.138.004 FILTER with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This filter page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4660.138.004 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: WG 98 PS
- 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 | 4660.138.004 |
|---|---|
| Normalized SKU | 4660138004 |
| Part name | FILTER |
| Product category | filter |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: diagram. 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.
Related Parts
- ZF 4681.138.003 FILTER
- ZF 4644.138.010 FILTER
- ZF 4651.138.400 FILTER
- ZF 4646.138.403 FILTER
- ZF 4646.138.001 FILTER
