Overview
The ZF 4657.137.010 EMERGENCY STEERING PUMP is a critical hydraulic component engineered specifically for the WG 210 Series transmission. This OEM genuine part ensures that steering remains operational in the event of a primary pump failure, providing a fail-safe mechanism for heavy-duty industrial vehicles. Positioned within the transmission’s hydraulic circuit, the emergency steering pump draws oil from the TRANSMISSION HOUSING to maintain pressure and flow to the steering system. The SKU 4657.137.010 is a direct replacement unit, built to ZF’s exacting standards for durability and reliability in demanding environments.
Symptoms of Failure
- Loss of steering assist during emergency operation: When the primary pump fails, a worn 4657.137.010 may not generate sufficient hydraulic pressure, causing the steering wheel to become stiff or unresponsive.
- Audible whining or grinding noise from the transmission: Internal wear or cavitation in the emergency pump produces high-pitched sounds, especially during low-speed maneuvers or when the system is under load.
- Hydraulic fluid leaks around the pump mounting area: Degraded seals or a cracked housing can lead to oil seepage, often visible near the HOUS.FRONT SECT or the HOUSING REAR PART.
- Intermittent steering response or jerky movements: A failing pump may deliver inconsistent oil flow, causing the steering to feel unpredictable or “spongy” during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4657.137.010 |
| OEM Reference | ZF 4657.137.010 |
| Material | High-strength aluminum alloy with hardened steel internals |
| Weight | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 210 mm x 120 mm x 95 mm |
| Operating Pressure | 180 bar (max) |
| Fluid Compatibility | ZF-approved ATF or hydraulic oil (ISO VG 46) |
| Mounting Bolts | Requires CAP SCREW (0636100801) and CAP SCREW (0636100803) |
Compatibility
This emergency steering pump is primarily designed for the ZF WG 210 Series transmission. It is also compatible with select models in the WG 180, WG 200, and WG 250 families, provided the transmission uses a similar hydraulic architecture. For precise fitment, verify the presence of the CYLINDRICAL PIN (0631306792) in the pump mounting bore, as this aligns the unit correctly. Always cross-reference your transmission’s serial number with ZF documentation to ensure compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4657201028 | HOUS.FRONT SECT | Front section housing for pump and valve assembly |
| 4657201013 | HOUSING REAR PART | Rear housing section for output shaft and bearings |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise pump mounting |
| 0636100801 | CAP SCREW | Fastener for securing pump to housing |
| 4656301148 | FIXING PLATE | Retains pump and prevents axial movement |
| 4657301034 | SCREEN SHEET | Fine mesh filter for inlet oil |
| 4657301035 | SCREEN SHEET | Coarse mesh filter for return oil |
| 0636100803 | CAP SCREW | Additional fastener for housing assembly |
| 4656301048 | OIL FEED.HOUSG. | Distributes oil from pump to steering circuit |
