Overview
The ZF 4657.137.012 EMERGENCY STEERING PUMP is a critical hydraulic component designed exclusively for the WG 210 Series transmission. This OEM genuine part ensures that steering remains operational even during primary pump failure, providing a fail-safe mechanism for heavy-duty industrial vehicles. Positioned within the transmission’s hydraulic circuit, the emergency steering pump activates automatically when system pressure drops, safeguarding operator control. The SKU 4657.137.012 is precision-engineered to meet ZF’s exacting standards, and it integrates seamlessly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain structural integrity under extreme loads.
Symptoms of Failure
- Loss of steering assist during operation: A worn emergency steering pump causes intermittent or complete loss of hydraulic pressure, making steering heavy and unresponsive—a common long-tail search query for “ZF WG210 steering pump failure.”
- Oil leaks around the pump housing: Degraded seals or cracked casings lead to fluid seepage, often visible near the HOUSING REAR PART, resulting in low oil levels and potential gear damage.
- Unusual whining or grinding noises: Internal bearing wear or cavitation produces high-pitched sounds during steering maneuvers, indicating imminent pump failure.
- Delayed emergency steering engagement: If the pump fails to activate promptly after primary pressure loss, it can lead to dangerous control lag, especially in off-road applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.137.012 |
| Type | Emergency Steering Pump |
| Material | High-strength aluminum alloy with hardened steel internals |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 210 mm x 120 mm x 95 mm |
| OEM Reference | ZF 4657.137.012 |
| Operating Pressure | 180–220 bar |
| Seal Material | Nitrile rubber (NBR) |
Compatibility
This emergency steering pump is primarily engineered for the ZF WG 210 Series transmission. Based on its hydraulic design and mounting flange pattern, it is also compatible with the WG 180, WG 200, and WG 250 series transmissions used in construction, agricultural, and material handling equipment. Always verify fitment with your specific transmission model, as variations in the CYLINDRICAL PIN alignment may affect installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Encloses and supports internal transmission gears and shafts |
| 4657201028 | HOUS.FRONT SECT | Front section housing for pump and clutch assembly |
| 4657201013 | HOUSING REAR PART | Rear section providing structural support and oil channeling |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise component positioning |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Mounting plate for pump and valve assemblies |
| 4657301034 | SCREEN SHEET | Filter screen for hydraulic fluid intake |
| 4657301035 | SCREEN SHEET | Secondary filter screen for high-pressure circuits |
| 0636100803 | CAP SCREW | High-tensile bolt for critical joints |
| 4656301048 | OIL FEED.HOUSG. | Oil feed housing directing lubricant to pump |
