Overview
The ZF 4642.137.018 EMERGENCY STEERING PUMP is a critical hydraulic component designed specifically for the WG 150 Series transmission. This OEM genuine part ensures that steering control is maintained even in the event of a primary pump failure, providing a redundant hydraulic circuit for emergency maneuvers. Mounted directly to the transmission housing, this pump interfaces with the main hydraulic system to deliver pressurized fluid to the steering gear when normal flow is interrupted. The SKU 4642.137.018 is engineered to ZF’s exacting tolerances, guaranteeing seamless integration with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205) assemblies. Its robust construction ensures long service life in demanding industrial applications, such as construction equipment and heavy-duty trucks.
Symptoms of Failure
When the ZF 4642.137.018 emergency steering pump begins to fail, operators may notice specific warning signs. Common failure symptoms include:
- Steering wheel becomes stiff or unresponsive during low-speed maneuvers, especially after prolonged operation.
- Hydraulic fluid leaks around the pump mounting flange or shaft seal, often visible as puddles under the vehicle.
- Unusual whining or grinding noises from the transmission area when steering, indicating internal wear or cavitation.
- Intermittent loss of steering assist under heavy load, which may trigger dashboard warning lights in modern equipment.
These issues often coincide with wear in the TYPE PLATE (0730365125) or the GROOVED STUD (0631311009), which secure the pump assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.137.018 |
| Product Type | Emergency Steering Pump |
| Material | High-strength cast iron with hardened steel gears |
| Weight | Approx. 8.5 kg (18.7 lbs) |
| Dimensions (L x W x H) | 280 mm x 150 mm x 120 mm |
| OEM Reference | ZF 4642.137.018 |
| Operating Pressure | Up to 180 bar |
| Flow Rate | 25 L/min at 1500 RPM |
| Mounting Type | Flange-mounted with 4-bolt pattern |
Compatibility
This emergency steering pump is primarily designed for the ZF WG 150 Series transmission. Based on its part number structure and hydraulic specifications, it is also compatible with the following ZF transmission models:
- ZF WG 150
- ZF WG 180 (with adapter plate)
- ZF WG 200 (limited compatibility, verify mounting)
- ZF WG 120 (requires housing modification)
For precise fitment, always cross-reference the TYPE PLATE (0730365125) on your transmission to confirm model designation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for transmission assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG150 series |
| 0730365125 | TYPE PLATE | Identification plate with model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing pump to housing |
| 4642301168 | SCREEN SHEET | Filter screen for hydraulic fluid intake |
| 4642301169 | SCREEN SHEET | Secondary filter screen for debris protection |
| 0636100621 | HEXAGON SCREW | Mounting bolt for pump and housing |
| 4642301186 | SCREEN SHEET | Fine mesh screen for high-flow applications |
| 4644106319 | SHIFT SYSTEM | Gear selection mechanism for transmission |
| 4644159356 | SHIFT SYSTEM | Alternate shift system variant |
