Overview
The ZF 4646.137.024 BOMBA DE DIRECCIÓN DE EMERGENCIA para WG260 is a critical hydraulic safety component engineered for ZF WG series powershift transmissions. This Original OEM emergency steering pump ensures continued directional control when the primary hydraulic circuit loses pressure, preventing catastrophic loss of maneuverability in heavy construction machinery. Positioned within the transmission’s auxiliary hydraulic system, the SKU 4646.137.024 interfaces directly with the TRANSMISSION HOUSING to provide redundant oil flow for steering functions. Its robust design meets stringent OEM standards for reliability under extreme load conditions.
Symptoms of Failure
- Delayed emergency steering response: When the pump wears, operators experience a 2-5 second lag before steering engages during primary pump failure, creating dangerous operational gaps.
- Audible cavitation noise from pump: A distinct whining or grinding sound during emergency activation indicates internal gear wear or seal degradation in the 4646.137.024 unit.
- Intermittent steering loss under load: Worn internal components cause pressure drops below 120 bar during heavy turning maneuvers, especially in WG260 transmissions operating at maximum torque.
- External hydraulic fluid seepage: Cracks in the pump housing or failed shaft seals produce visible oil leaks around the mounting interface with the HOUSING assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4646.137.024 |
| Product Type | Emergency Steering Pump (Bomba de Dirección de Emergencia) |
| Material | High-tensile cast iron body with hardened steel gears |
| Weight | 4.8 kg (10.6 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 85 mm |
| Maximum Operating Pressure | 180 bar (2,610 psi) |
| Flow Rate at 1,500 RPM | 22 L/min |
| Mounting Bolt Torque | 45 Nm (use 螺栓 M10 x 1.5) |
| Identification | Includes TYPE PLATE with serial number |
Compatibility
This emergency steering pump is specifically calibrated for ZF WG260 transmissions used in construction loaders and graders. It also fits WG180, WG200, and WG250 models when paired with the correct ADAPTER PLATE. For WG310 and WG360 variants, verify the mounting flange pattern matches the 4646.137.024’s 4-bolt configuration. Always inspect the SHIFT SYSTEM and POT during replacement to ensure full hydraulic circuit integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101162 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4646301334 | HOUSING | Secondary housing for auxiliary pump mounting |
| 0636115293 | 螺栓 | M10 mounting bolts for pump attachment |
| 0730365125 | TYPE PLATE | Identification plate with OEM specifications |
| 4646201003 | POT | Hydraulic pressure sensor for circuit monitoring |
| 4646106024 | SHIFT SYSTEM | Gear selection control module |
| 4646306071 | GASKET | Seal between pump and housing |
| 4646306072 | ADAPTER PLATE | Mounting interface for different transmission models |
| 4646306073 | GASKET | Secondary seal for adapter plate |
| 0636102065 | CAP SCREW | Fastener for hydraulic line connections |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
