Overview
The ZF 0501.209.858 SOLENOID VALVE is a precision electro-hydraulic actuator engineered for the WG210 and WG98 transmission series. This OEM genuine part modulates oil flow to control clutch and brake application, directly influencing shift quality and torque converter lockup. Mounted within the valve body assembly, the solenoid converts electrical signals from the transmission control unit into hydraulic pressure. The SKU 0501.209.858 is a direct replacement for the original factory component, ensuring exact fitment and performance. For proper sealing and alignment, this solenoid is often installed alongside the 4657101042: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT.
Symptoms of Failure
- Erratic or delayed gear engagement: When the solenoid valve wears, hydraulic pressure becomes inconsistent, causing a noticeable lag when shifting from Neutral to Drive or Reverse.
- Intermittent transmission slipping: A failing 0501.209.858 can cause the transmission to momentarily lose power under load, especially during upshifts between 2nd and 3rd gear.
- Harsh or flared shifts: You may experience abrupt jarring shifts or a momentary engine flare (RPM spike) as the solenoid fails to regulate clutch apply pressure smoothly.
- Transmission warning light and limp mode: The TCM detects electrical or hydraulic faults from this valve, triggering a check engine light and forcing the transmission into a protective fail-safe mode.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.209.858 |
| OEM Reference | ZF 0501.209.858 |
| Type | Normally Closed Solenoid Valve |
| Operating Voltage | 12V DC (nominal) |
| Coil Resistance | 5.0 – 6.5 Ohms at 20°C |
| Max Operating Pressure | 18 bar (261 psi) |
| Body Material | Steel with corrosion-resistant coating |
| Seal Material | Nitrile rubber (NBR) |
| Weight | Approx. 0.35 kg (0.77 lbs) |
| Dimensions (L x W x H) | 85 mm x 30 mm x 30 mm |
Compatibility
This solenoid valve is specifically designed for ZF WG transmission series that utilize a modular valve body architecture. It is a direct fit for the WG210 and WG98 series. Based on its hydraulic flow characteristics, it is also compatible with the WG180, WG200, and WG250 models when used in the same valve bore position. Always verify the solenoid location against your transmission’s valve body diagram. The valve body assembly integrates with the 4657201013: HOUSING REAR PART and is secured using a 0631306792: CYLINDRICAL PIN for precise alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4657201028 | HOUS.FRONT SECT | Front section housing for torque converter and pump |
| 4657201013 | HOUSING REAR PART | Rear section enclosing output shaft and clutches |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for valve body and housing mating |
| 0636100801 | CAP SCREW | Fastener for valve body retention |
| 4656301148 | FIXING PLATE | Retaining plate for solenoid valve assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for valve body oil circuit |
| 4657301035 | SCREEN SHEET | Secondary filter screen for hydraulic return line |
| 0636100803 | CAP SCREW | Bolt for securing housing sections |
| 4656301048 | OIL FEED.HOUSG. | Oil feed housing directing fluid to valve body |
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