Overview
The ZF 4646.137.024 EMERGENCY STEERING PUMP is a critical hydraulic component designed specifically for the WG260 transmission series. This OEM genuine part ensures that steering functionality remains operational even in the event of a primary pump failure, providing a fail-safe mechanism for heavy-duty industrial vehicles. Located within the transmission’s auxiliary hydraulic circuit, this pump activates automatically to maintain steering pressure, preventing loss of vehicle control. The SKU 4646.137.024 is precision-engineered to ZF’s exacting tolerances, guaranteeing seamless integration with the 4646101162: TRANSMISSION HOUSING and the 4646301334: HOUSING assembly. This part is indispensable for operators requiring uninterrupted steering response in demanding environments such as mining, construction, and material handling.
Symptoms of Failure
When the ZF 4646.137.024 emergency steering pump begins to degrade, operators may notice specific warning signs. Recognizing these symptoms early can prevent costly downtime and safety hazards:
- Delayed or unresponsive steering in emergencies: A worn pump fails to build adequate hydraulic pressure, causing a lag when the emergency system is activated. This is a common long-tail search query for “ZF WG260 steering pump failure symptoms.”
- Audible whining or grinding noises from the transmission: Internal bearing wear or cavitation within the pump produces abnormal sounds, particularly during steering maneuvers. Search terms like “emergency steering pump noise WG258” often lead to this issue.
- Hydraulic fluid leaks near the pump mounting area: Degraded seals or housing cracks allow oil to escape, visible as drips or puddles under the vehicle. This symptom is frequently searched as “ZF transmission oil leak emergency pump.”
- Intermittent loss of steering assist: The pump may sporadically fail to engage, resulting in sudden heavy steering effort, especially at low speeds. This aligns with queries for “WG260 steering pump intermittent failure.”
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4646.137.024 |
| Product Type | Emergency Steering Pump (Gear Pump) |
| OEM Reference | ZF (Zahnradfabrik Friedrichshafen) |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight (approx.) | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 85 mm |
| Operating Pressure | 180 bar (max) |
| Flow Rate | 12 L/min at 1500 RPM |
| Mounting Type | Flange-mounted with four bolt holes |
Compatibility
This emergency steering pump is engineered for the ZF WG260 series transmissions, but its design also accommodates select models within the broader WG family. Verified compatibility includes the WG258 and WG260 series, which share the same hydraulic architecture. Additionally, it may be retrofitted to earlier WG180 and WG200 transmissions with minor modifications, though OEM consultation is recommended. The pump interfaces directly with the 0636115293: 螺栓 (bolts) for secure attachment and the 0730365125: TYPE PLATE for identification. Always verify your transmission’s serial number against the ZF parts catalog to ensure exact fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101162 | TRANSMISSION HOUSING | Main structural casing for the transmission assembly |
| 4646301334 | HOUSING | Secondary housing for auxiliary hydraulic components |
| 0636115293 | 螺栓 | High-tensile bolts for pump mounting |
| 0730365125 | TYPE PLATE | Identification plate with serial and model numbers |
| 4646201003 | POT | Hydraulic reservoir or accumulator component |
| 4646106024 | SHIFT SYSTEM | Controls gear engagement and clutch operation |
| 4646306071 | GASKET | Seals mating surfaces to prevent fluid leaks |
| 4646306072 | ADAPTER PLATE | Mounting interface between pump and housing |
| 4646306073 | GASKET | Secondary seal for adapter plate connection |
| 0636102065 | CAP SCREW | Fastener for securing hydraulic lines or covers |
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