Overview
The ZF 4616.137.008 EMERGENCY STEERING PUMP is a critical hydraulic component engineered specifically for the WG 65 Series transmission. This OEM genuine part ensures that steering remains operational even during primary pump failure, providing essential redundancy for heavy-duty industrial vehicles. Positioned within the transmission’s auxiliary hydraulic circuit, the pump activates automatically when main pressure drops, safeguarding maneuverability in demanding environments. The SKU 4616.137.008 is precision-machined to ZF’s exacting standards, guaranteeing seamless integration with the 4616105413: OUTPUT and 4616203017: OUTPUT FLANGE assemblies. Its robust design minimizes downtime and extends service intervals, making it a vital investment for fleet operators.
Symptoms of Failure
- Intermittent steering loss under load: When the emergency pump wears, operators may notice sporadic loss of hydraulic assist during low-speed maneuvers or heavy lifting, often misdiagnosed as a main pump issue.
- Audible whining or grinding from the transmission housing: A failing 4616.137.008 produces distinct metallic noises, especially during cold starts, indicating internal bearing or gear wear.
- Visible hydraulic fluid leaks near the pump mounting point: Degraded seals or housing cracks cause oil seepage, often pooling around the 4616101117: TRANSMISSION HOUSING interface.
- Erratic steering response after prolonged operation: The pump may fail to maintain consistent pressure, leading to sudden stiffness or delayed reaction, particularly in high-temperature conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.137.008 |
| OEM Reference | ZF 4616.137.008 |
| Material | High-strength aluminum alloy with hardened steel internals |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 120 mm |
| Operating Pressure | 180 bar (max) |
| Flow Rate | 12 L/min at 1500 RPM |
| Seal Type | NBR O-ring (compatible with 0634313118: O-RING) |
| Mounting Bolts | M10 hexagon screws (use 0636011038: HEXAGON SCREW) |
Compatibility
This emergency steering pump is designed for the ZF WG 65 Series, but its hydraulic architecture also supports several related transmission models. Verified compatibility includes WG180, WG200, WG240, and WG250 series, where the pump mounts directly to the transmission housing using 0636011038: HEXAGON SCREW fasteners. For WG65 variants, always confirm the output flange configuration—the 4616203017: OUTPUT FLANGE must match the pump’s drive spline. Additionally, the pump integrates with the 4616101117: TRANSMISSION HOUSING using a cylindrical pin (reference 0631306085: CYLINDRICAL PIN) for precise alignment. Always consult your ZF service manual for model-specific fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from transmission to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to propeller shaft |
| 4616101117 | TRANSMISSION HOUSING | Encloses and supports internal gear sets |
| 0636011038 | HEXAGON SCREW | Secures pump and housing assemblies |
| 0636016015 | HEXAGON SCREW | Alternate fastener for high-torque applications |
| 0631306085 | CYLINDRICAL PIN | Aligns pump to housing during installation |
| 0634313118 | O-RING | Seals hydraulic connections against leaks |
| 0732611049 | FILTER INSERT | Removes contaminants from hydraulic fluid |
| 0634303718 | O-RING | Secondary seal for high-pressure ports |
| 0636610082 | STUD | Threaded rod for mounting brackets |
