Overview
The ZF 4657.162.400 PRESSURE REGULATOR is a precision hydraulic control component engineered specifically for the WG 210 Series transmission. This OEM genuine part governs the modulation of hydraulic pressure within the valve body assembly, ensuring consistent clutch and brake application during gear shifts. The SKU 4657.162.400 acts as the critical interface between the transmission control unit and the hydraulic circuit, maintaining optimal line pressure across varying load conditions. Without this regulator, the transmission cannot achieve the precise pressure modulation required for smooth power delivery.
Symptoms of Failure
When the ZF 4657.162.400 pressure regulator begins to degrade, operators typically notice these specific failure indicators:
- Erratic shift timing and gear slipping under load – A worn regulator fails to maintain steady hydraulic pressure, causing clutches to slip during acceleration.
- Delayed engagement when shifting from Neutral to Drive or Reverse – Reduced initial pressure buildup results in a noticeable lag before the transmission engages.
- Oil leaks around the valve body area – Internal seal degradation on the regulator allows transmission fluid to bypass, leading to external seepage.
- Harsh or flared upshifts and downshifts – Inconsistent pressure modulation produces jarring gear changes or momentary loss of power during shifts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.162.400 |
| OEM Reference | ZF 4657.162.400 |
| Material | Hardened steel with anodized aluminum spool |
| Weight | 0.35 kg (0.77 lbs) |
| Dimensions (L x W x H) | 85 mm x 32 mm x 32 mm |
| Operating Pressure Range | 5–22 bar |
| Seal Type | Nitrile rubber O-rings (included) |
Compatibility
This pressure regulator is designed for the ZF WG 210 Series transmission family. Based on its hydraulic architecture, it also fits the following ZF models: WG 180, WG 200, WG 211, and WG 212. The 4657.162.400 is not backward-compatible with older ZF 4HP or 5HP series units. Always verify the valve body casting number before installation.
During replacement, the regulator mounts directly into the valve body assembly, which is secured within the TRANSMISSION HOUSING. The front section of the housing, known as the HOUS.FRONT SECT, must be removed for access. The rear portion, the HOUSING REAR PART, provides alignment for the valve body. A CYLINDRICAL PIN is used to index the regulator spool during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gearset and valve body |
| 4657201028 | HOUS.FRONT SECT | Front housing section covering pump and converter |
| 4657201013 | HOUSING REAR PART | Rear housing section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for valve body and regulator spool |
| 0636100801 | CAP SCREW | Fastener for valve body cover plate |
| 4656301148 | FIXING PLATE | Retains pressure regulator in valve body bore |
| 4657301034 | SCREEN SHEET | Fine mesh filter for valve body oil gallery |
| 4657301035 | SCREEN SHEET | Secondary filter screen for regulator circuit |
| 0636100803 | CAP SCREW | Fastener for housing front section |
| 4656301048 | OIL FEED.HOUSG. | Oil feed tube connecting pump to valve body |
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