Overview
The ZF 4681.201.035 Suction Tube is a critical fluid delivery component engineered for the WG190 and WG210 transmission series. Positioned within the lower valve body assembly, this OEM genuine part channels hydraulic fluid from the sump to the pump, ensuring consistent lubrication and clutch application pressure. The SKU 4681.201.035 is precision-machined to maintain optimal flow dynamics, directly supporting the thermal regulation of the TRANSMISSION HOUSING and adjacent assemblies. Without a properly sealed suction tube, the entire hydraulic circuit loses efficiency, leading to premature wear on internal components.
Symptoms of Failure
- Intermittent gear slipping under load: A cracked or warped suction tube allows air ingestion, causing hydraulic pressure drops that manifest as delayed engagement or clutch chatter during acceleration.
- Low transmission fluid pressure warnings: When the 4681.201.035 tube develops pinhole leaks, the pump cavitates, triggering dashboard alerts and erratic shift patterns.
- Visible fluid seepage near the bell housing: Deteriorated O-ring seals at the tube’s mounting flange produce slow drips that accumulate on the HOUS.FRONT SECT and surrounding components.
- Whining noise from the pump area: Starvation caused by a blocked or collapsed suction tube generates a high-pitched whine that intensifies with RPM, indicating imminent hydraulic failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.201.035 |
| Material | Die-cast aluminum alloy with nitrile sealing |
| Length | 185 mm (estimated) |
| Inner Diameter | 12.5 mm |
| Weight | 0.34 kg |
| OEM Reference | ZF 4681.201.035 |
| Seal Type | Integrated O-ring groove |
Compatibility
This suction tube is specifically designed for ZF WG190 and WG210 series transmissions, commonly found in medium-duty commercial vehicles and off-highway equipment. It also fits select WG180 and WG200 variants where the hydraulic pump mounting geometry matches. The 4681.201.035 interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION, making it essential for rebuilds involving those castings. Always verify the production date code on your transmission’s nameplate, as minor revisions exist between early and late WG210 units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101088 | TRANSMISSION HOUSING | Main structural casing enclosing all gear sets |
| 4657201183 | HOUS.FRONT SECT | Front section supporting pump and converter |
| 4657201184 | HOUSING REAR PART | Rear casting for output shaft and PTO mount |
| 4657298111 | HOUSING REAR SECTION | Extended rear housing for planetary gears |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for suction tube flange |
| 4681301015 | FIXING PLATE | Retains suction tube against vibration |
| 4681301016 | SCREEN SHEET | Fine mesh filter for inlet protection |
| 4681301017 | SCREEN SHEET | Coarse mesh pre-filter for debris |
| 0636100803 | CAP SCREW | M8 bolt for screen sheet retention |
Frequently Asked Questions
Q: Can I reuse the old O-ring when installing a new 4681.201.035 suction tube?
A: No. The O-ring seal deforms permanently during service. Always install a fresh seal to prevent air ingestion and subsequent pump cavitation.
Q: Does this part fit the ZF WG180 transmission?
A: It fits WG180 models that share the same pump housing bolt pattern as the WG190. Check the distance between the two mounting holes on your existing tube; if it measures 185 mm center-to-center, the 4681.201.035 is compatible.
Q: What torque specification should I use for the cap screws?
A: Use 25 Nm for the M10 cap screws (0636100801) and 18 Nm for the M8 cap screws (0636100803). Over-torquing can distort the tube flange and cause leaks.
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