Overview
The ZF 4681.137.000 EMERGENCY STEERING PUMP is a critical hydraulic component engineered for the BP210 and BP230 series transmissions. This OEM genuine part provides auxiliary steering pressure in the event of a primary pump failure, ensuring continued maneuverability of heavy-duty industrial vehicles. Mounted directly to the transmission housing, the emergency steering pump (SKU: 4681.137.000) integrates with the main hydraulic circuit to maintain steering function during critical moments. It works in concert with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a sealed, high-pressure fluid pathway.
Symptoms of Failure
When the 4681.137.000 emergency steering pump deteriorates, operators will notice distinct performance issues. Look for these specific failure symptoms:
- Intermittent steering loss under load: The pump fails to maintain pressure during heavy turning, causing the steering wheel to become stiff or unresponsive.
- Hydraulic fluid leaks near the pump mounting flange: Worn seals or a cracked pump body allow oil to escape, often pooling around the HOUSING REAR PART connection point.
- Unusual whining or grinding noises from the transmission: Cavitation or bearing wear inside the pump generates audible distress signals during operation.
- Delayed emergency steering engagement: The pump takes longer than normal to activate, increasing the risk of a complete steering loss scenario.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4681.137.000 |
| OEM Reference | ZF 4681.137.000 |
| Material | High-grade aluminum alloy with 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 | Up to 180 bar |
| Fluid Compatibility | ZF TE-ML 03, 05, 07 approved oils |
Compatibility
This emergency steering pump is specifically designed for the BP210 and BP230 transmission series. It is also compatible with select ZF models that share the same hydraulic architecture, including the WG180, WG200, and WG210 series. The pump interfaces directly with the CASE assembly, which houses the internal gearing. Always verify your transmission model and serial number before installation to ensure a proper fit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4681101002 | TRANSMISSION HOUSING | Main structural enclosure for gear sets and shafts |
| 4681201007 | HOUS.FRONT SECT | Front section housing the input shaft and bearings |
| 4681201008 | HOUSING REAR PART | Rear section supporting output shaft and PTO mounts |
| 4681298001 | CASE | Encloses the pump and valve assembly |
| 0631306074 | CYLINDRICAL PIN | Alignment pin for precise component positioning |
| 0636100801 | CAP SCREW | Fastener securing the pump to the housing |
| 4681301015 | FIXING PLATE | Mounting plate for stabilizing the pump assembly |
| 4681301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid intake |
| 4681301017 | SCREEN SHEET | Secondary filter screen for debris protection |
| 0636100803 | CAP SCREW | High-tensile bolt for final pump retention |
Frequently Asked Questions
Q: Can the 4681.137.000 pump be rebuilt, or must it be replaced?
A: While some internal seals can be replaced, ZF recommends full replacement with an OEM genuine unit to ensure reliable emergency steering performance. Rebuilt pumps may not meet original pressure specifications.
Q: How do I confirm this pump fits my BP210 transmission?
A: Check the transmission serial number plate on the TRANSMISSION HOUSING. The BP210 and BP230 series both use this pump, but verify the mounting flange pattern matches your existing unit.
Q: What causes premature failure of the emergency steering pump?
A: Contaminated hydraulic fluid is the most common cause. Always replace the SCREEN SHEET filters during pump installation to prevent debris from damaging the new unit.
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