Overview
The ZF 4657.201.034 TUBE is a critical hydraulic conduit within the WG211 series transmission, responsible for directing pressurized oil to the clutch packs and valve body. As an OEM genuine part, this tube ensures precise fluid flow under high thermal and mechanical loads. The SKU 4657.201.034 is engineered to maintain consistent line pressure, preventing cavitation and ensuring smooth gear engagement. It sits directly between the pump housing and the main control unit, often working in tandem with the 4657120005: PRESSURE REGULATOR to stabilize hydraulic output.
Symptoms of Failure
- External oil leaks near the transmission housing: A cracked or corroded tube allows ATF to escape, leaving puddles under the vehicle and reducing fluid levels.
- Delayed or harsh gear engagement: When the tube fails to deliver adequate pressure, shifts become sluggish or slam into gear, especially under load.
- Erratic shifting at highway speeds: Intermittent pressure loss causes the transmission to hunt between gears or slip during acceleration.
- Overheating transmission fluid: Restricted flow through a damaged tube increases friction and thermal stress, triggering warning lights.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.201.034 |
| Material | Seamless steel with anti-corrosion coating |
| Length | 185 mm (approx.) |
| Outer Diameter | 12 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.12 kg |
| OEM Reference | ZF 4657.201.034 |
| Operating Pressure | Up to 18 bar |
Compatibility
This tube is primarily designed for the WG 211 Series transmission, but it also fits select variants in the WG180, WG200, and WG250 families due to shared hydraulic architectures. It is commonly used in off-highway vehicles, construction equipment, and heavy-duty trucks. For optimal performance, always pair this tube with the 0501211384: VALVE and the 0630532183: INDENTED RING to secure the connection. Additionally, the 4656306145: PISTON must be inspected for wear when replacing the tube, as debris from a failing piston can obstruct the new line.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls main line pressure to prevent spikes |
| 0501211384 | VALVE | Directs fluid flow between clutch circuits |
| 0630532183 | INDENTED RING | Locks tube into housing bore |
| 4656306145 | PISTON | Applies force to clutch packs |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Secures valve body alignment |
| 0631610026 | SET SCREW | Adjusts shift timing |
| 4657101048 | TRANSMISSION HOUSING | Main structural casing |
| 4657301061 | HOUS.FRONT SECT | Front section of transmission housing |
| 4657301062 | HOUSING REAR PART | Rear section of transmission housing |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
