Overview
The ZF 4642.221.149 SUCTION TUBE is a critical hydraulic component engineered for the WG150 transmission series. This OEM genuine part serves as the primary conduit for drawing transmission fluid from the sump to the pump, ensuring consistent lubrication and cooling under heavy load. Positioned within the lower valve body assembly, the SKU 4642.221.149 maintains precise fluid flow to prevent cavitation and pressure drops. It works in tandem with the 4642101108: TRANSMISSION HOUSING and the 4642301208: TRANSMISSION HOUSING to seal the hydraulic circuit, while the 0730365125: TYPE PLATE provides critical identification for the assembly.
Symptoms of Failure
When the suction tube wears or cracks, operators often report intermittent gear slipping under acceleration due to insufficient hydraulic pressure. A second common failure is low transmission fluid level with no visible external leaks, as the tube draws air instead of oil. You may also notice whining or cavitation noise from the pump, especially during cold starts. Finally, delayed engagement when shifting from Neutral to Drive frequently points to a compromised suction path. The 0631311009: GROOVED STUD must be torqued correctly to avoid distorting the tube flange.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4642.221.149 |
| Material | Die-cast aluminum alloy (A380) |
| Length | 215 mm (8.46 in) |
| Inner Diameter | 22 mm (0.87 in) |
| Weight | 0.34 kg (0.75 lbs) |
| OEM Reference | ZF 4642 221 149 |
| Seal Type | Integrated O-ring groove (uses 0634303340: O-RING) |
Compatibility
This suction tube is primarily designed for the ZF WG150 series, but it also fits the WG180 and WG200 models when used with the correct 4642306254: ADAPTER. It is not compatible with the WG120 or WG250 series without modifying the pump housing. For proper installation, always pair it with a new 0630361029: SEALING CAP and 0636100621: HEXAGON SCREW to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses gear train and valve body |
| 4642301208 | TRANSMISSION HOUSING | Rear housing for output shaft support |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial |
| 0631311009 | GROOVED STUD | Locates and secures housing alignment |
| 4642301168 | SCREEN SHEET | Coarse filtration for sump pickup |
| 4642301169 | SCREEN SHEET | Fine mesh filtration for valve body |
| 0636100621 | HEXAGON SCREW | Fastens suction tube to pump flange |
| 0630361029 | SEALING CAP | Blocks unused port on housing |
| 4642306254 | ADAPTER | Converts tube fitment for WG180/200 |
| 0634303340 | O-RING | Seals tube-to-housing interface |
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