Overview
This OEM genuine ZF 4656.137.013 Emergency Steering Pump is a critical hydraulic component designed specifically for the WG190 and WG210 transmission series. Positioned within the auxiliary hydraulic circuit, this pump provides immediate pressurized oil flow to the steering system when the primary engine-driven pump is inoperative, ensuring safe vehicle maneuverability during emergency conditions. The SKU 4656.137.013 interfaces directly with the TRANSMISSION HOUSING and is mounted adjacent to the HOUS.FRONT SECT to maintain uninterrupted hydraulic flow. As a genuine ZF part, it guarantees exact fitment and factory-specified pressure output for your WG190 or WG210 powertrain.
Symptoms of Failure
- Loss of emergency steering assist: When the pump wears internally, you may notice a sudden inability to steer the vehicle during engine stall or low-RPM conditions, often accompanied by a whining noise from the pump housing.
- External oil leaks at mounting flange: Deteriorated seals around the pump body cause hydraulic fluid to weep onto the HOUSING REAR PART, leading to low fluid levels and eventual pump cavitation.
- Erratic steering response under load: A failing 4656.137.013 produces inconsistent pressure, resulting in jerky or delayed steering wheel movement when the vehicle is stationary or moving slowly.
- Increased operating temperature: Internal bypass leakage forces the pump to run continuously, overheating the hydraulic fluid and potentially damaging the HOUSING REAR SECTION.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4656.137.013 |
| OEM Reference | ZF 4656.137.013 |
| Material | High-strength aluminum alloy with hardened steel gears |
| Weight | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 210 mm x 120 mm x 95 mm |
| Max Operating Pressure | 180 bar (2,610 psi) |
| Flow Rate | 12 L/min at 1,500 RPM |
| Mounting Type | Flange-mounted with 4 bolt holes |
Compatibility
This emergency steering pump is engineered for the ZF WG190 and WG210 transmission series. It is also compatible with the WG180 and WG200 models when used in conjunction with the correct FIXING PLATE and CYLINDRICAL PIN. For WG220 or WG250 applications, verify housing interface dimensions before installation. The pump is not designed for use with older WG160 or WG170 series transmissions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101088 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and hydraulic circuits |
| 4657201183 | HOUS.FRONT SECT | Forward section of the transmission housing supporting input shaft bearings |
| 4657201184 | HOUSING REAR PART | Rear housing segment that contains output shaft and parking brake assembly |
| 4657298111 | HOUSING REAR SECTION | Alternate rear housing variant for specific WG210 configurations |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing-to-pump positioning |
| 0636100801 | CAP SCREW | M10 fastener securing pump to housing flange |
| 4681301015 | FIXING PLATE | Mounting bracket that stabilizes pump against vibration |
| 4681301016 | SCREEN SHEET | Fine mesh filter protecting pump inlet from debris |
| 4681301017 | SCREEN SHEET | Coarse mesh pre-filter for high-flow applications |
| 0636100803 | CAP SCREW | M8 bolt for securing screen sheet and fixing plate |
Frequently Asked Questions
Q: Can the 4656.137.013 be repaired, or must it be replaced?
A: This emergency steering pump is a sealed unit. Internal gear wear or seal failure requires complete replacement with the OEM genuine part to maintain proper emergency steering pressure.
Q: How do I verify compatibility with my WG190 transmission?
A: Check the casting number on your TRANSMISSION HOUSING. If it matches the WG190 or WG210 series, the 4656.137.013 will bolt directly using the included CAP SCREW and FIXING PLATE.
Q: What is the typical service life of this emergency steering pump?
A: Under normal operating conditions and with clean hydraulic fluid, the pump lasts 5,000–8,000 hours. Contaminated fluid or frequent emergency activations can reduce lifespan significantly.
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