Overview
The ZF 4642.137.013 EMERGENCY STEERING PUMP is a critical hydraulic component engineered specifically for the WG 150 series transmission. This OEM genuine part ensures that steering functionality remains available even during a primary pump failure, providing a redundant hydraulic circuit for emergency maneuvers. Located within the transmission’s auxiliary hydraulic system, the pump engages automatically when main pressure drops, safeguarding vehicle control in demanding industrial applications. The SKU 4642.137.013 is manufactured to ZF’s exacting tolerances, guaranteeing seamless integration with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205) assemblies.
Symptoms of Failure
- Delayed or unresponsive steering in low-pressure conditions: When the emergency pump wears, the backup hydraulic circuit fails to pressurize quickly, causing a lag in steering response during critical maneuvers.
- Audible whining or grinding noise from the transmission housing: Internal bearing wear or cavitation within the pump produces distinct metallic sounds, often mistaken for gear issues.
- Hydraulic fluid leaks around the pump mounting flange: Degraded seals or housing cracks allow oil to escape, leading to low fluid levels and eventual system starvation.
- Intermittent loss of steering assist under load: The pump may struggle to maintain output pressure during heavy-duty operations, resulting in erratic steering behavior.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4642.137.013 |
| Product 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 |
| Operating Pressure Range | 120–180 bar |
| Flow Rate | 18 L/min at 1500 RPM |
| OEM Reference | ZF 4642.137.013 |
| Seal Type | Viton (FKM) O-rings |
Compatibility
This emergency steering pump is primarily designed for the ZF WG 150 series, but its hydraulic specifications also support the WG 180 and WG 200 transmission models when used with the appropriate TYPE PLATE (0730365125) for identification. It integrates directly with the GROOVED STUD (0631311009) for secure mounting. For optimal performance, verify compatibility with your specific transmission housing variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural enclosure for gear and pump assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for specific WG models |
| 0730365125 | TYPE PLATE | Identification plate for transmission model and specs |
| 0631311009 | GROOVED STUD | Fastener for pump and housing alignment |
| 4642301168 | SCREEN SHEET | Hydraulic fluid filtration mesh |
| 4642301169 | SCREEN SHEET | Secondary filtration screen for debris |
| 0636100621 | HEXAGON SCREW | Mounting bolt for pump and housing |
| 4642301186 | SCREEN SHEET | Fine-mesh screen for high-pressure circuits |
| 4644106300 | SHIFT SYSTEM | Gear selection and engagement mechanism |
| 4644306500 | COVER PLATE | Protective cover for pump access port |
