Overview
The ZF 4660.221.031 SUCTION TUBE is a critical hydraulic component engineered for the WG 98 Series transmission family. This genuine OEM part serves as the primary conduit for drawing transmission fluid from the sump into the pump assembly, ensuring consistent lubrication and cooling under high-torque conditions. The SKU 4660.221.031 is precision-machined to maintain optimal fluid velocity and prevent cavitation within the valve body. It mounts directly to the 4660101020: TRANSMISSION HOUSING and interfaces with the 4660301056: HOUSING II, forming a sealed fluid path that is essential for reliable gear engagement.
Symptoms of Failure
When the ZF 4660.221.031 suction tube deteriorates, operators often encounter distinct performance issues. Watch for these specific failure indicators:
- Low fluid pressure warnings – A cracked or warped tube allows air ingestion, causing pressure drops during acceleration.
- Audible pump whine or cavitation – Restricted flow through a damaged tube creates a high-pitched noise from the transmission pump.
- Intermittent gear slipping under load – Insufficient fluid delivery starves clutches, leading to delayed engagement on inclines.
- Visible fluid seepage near the housing joint – A compromised seal at the tube connection point leaves oily residue on the 0631306174: CYLINDRICAL PIN mounting area.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.221.031 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Length | 210 mm (estimated) |
| Inner Diameter | 18 mm |
| Weight | 0.35 kg |
| OEM Reference | ZF 4660.221.031 |
| Seal Type | Integrated O-ring groove (compatible with 0634100317: O-RING) |
Compatibility
This suction tube is specifically designed for the ZF WG 98 Series transmissions, including models such as WG180, WG200, and WG250. It is also a direct fit for certain WG 98 variants used in off-highway and industrial equipment. The part integrates with the 0769123894: TYPE PLATE for proper identification and requires the 0636103273: CAP SCREW for secure mounting. Always verify your transmission serial number against the WG 98 family to ensure compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4660301056 | HOUSING II | Secondary housing supporting the suction tube and valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals fluid passages during maintenance |
| 0634100317 | O-RING | Primary seal between suction tube and housing |
| 0636103273 | CAP SCREW | Fastener for securing the suction tube flange |
| 0634306311 | O-RING | Secondary seal for the housing interface |
| 4660321029 | FIXING PLATE | Retains the suction tube in its seated position |
| 0636103274 | CAP SCREW | Hardware for fixing plate attachment |
