Overview
The ZF 0501.206.733 REDUCTION VALVE is a precision hydraulic control component engineered specifically for the WG 200 series powershift transmissions. This OEM genuine part regulates oil pressure to the clutch packs, ensuring smooth gear engagement and consistent torque delivery under heavy-duty cycles. Installed within the valve body assembly, the SKU 0501.206.733 directly modulates hydraulic flow to prevent pressure spikes during directional shifts. For proper sealing and structural integrity, this valve interfaces with the 4644101216: TRANSMISSION HOUSING and the 4644301223: TRANSMISSION HOUSING, both of which house the valve bore. Additionally, the 0730365067: TYPE PLATE identifies the exact transmission variant, while the 0631311009: GROOVED STUD secures the valve assembly to the housing.
Symptoms of Failure
- Delayed or harsh shifting: A worn reduction valve causes erratic clutch engagement, leading to noticeable lag or jarring shifts during acceleration.
- Transmission oil leaks around valve body: Degraded seals on the 0501.206.733 allow ATF to seep past the bore, visible as drips near the housing joint.
- Gear slipping under load: Inadequate pressure regulation results in clutch pack slippage, particularly when climbing grades or hauling heavy payloads.
- Erratic neutral-to-drive engagement: The valve fails to maintain stable pilot pressure, causing the transmission to hesitate or lurch when shifting from park.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.206.733 |
| OEM Reference | ZF 0501.206.733 |
| Material | Hardened steel with nitrile seals |
| Overall Length | 48 mm |
| Bore Diameter | 22 mm |
| Operating Pressure | 12–18 bar |
| Weight | 0.14 kg |
| Seal Type | O-ring energized |
Compatibility
This reduction valve is primarily designed for the ZF WG 200 series, including WG200, WG210, and WG220 models used in construction and agricultural machinery. It also fits select WG180 variants that share the same valve body architecture. Always verify the housing bore condition; pairing with a new 4644303060: COVER PLATE or 4644303061: COVER PLATE ensures proper sealing. For complete hydraulic circuit restoration, replace the 0634306525: O-RING and 0636305026: SCREW PLUG during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for valve bore |
| 4644301223 | TRANSMISSION HOUSING | Secondary housing for clutch pack |
| 0730365067 | TYPE PLATE | Model identification tag |
| 0631311009 | GROOVED STUD | Valve retention fastener |
| 4644303060 | COVER PLATE | Valve bore access cover |
| 4644303061 | COVER PLATE | Alternate bore cover variant |
| 0634306525 | O-RING | Hydraulic seal for valve |
| 0636305026 | SCREW PLUG | Pressure port closure |
| 4644301279 | SCREEN SHEET | Debris filtration element |
| 4644301088 | SEALING CAP | End cap for valve bore |
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