Overview
The ZF 4657.123.017 CONTROL UNIT is a critical electronic actuator module designed for the WG191 and WG211 series powershift transmissions. This OEM genuine part manages hydraulic pressure modulation and shift timing within the valve body assembly, directly governing clutch engagement and gear selection. As the brain of the transmission control system, the 4657.123.017 interprets input signals from sensors and the vehicle ECU to execute precise gear changes. This control unit integrates seamlessly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT, ensuring that hydraulic circuits are properly sealed and aligned for optimal performance.
Symptoms of Failure
- Erratic or delayed gear engagement: When the control unit fails, operators may experience hesitation or harsh shifting when moving from neutral to drive or reverse. This is often accompanied by a “transmission control unit failure” diagnostic code.
- Intermittent gear slipping under load: A worn 4657.123.017 can cause the transmission to slip out of gear during heavy hauling or uphill operation, leading to reduced torque delivery and potential driveline damage.
- Oil contamination in the electrical connector: Internal seal degradation allows transmission fluid to migrate into the control unit’s wiring harness, causing short circuits and intermittent “transmission oil leak at control unit” symptoms.
- No shift response or limp mode activation: Complete failure of the control unit forces the transmission into a default limp-home mode, locking the vehicle in a single gear and triggering warning lights on the dashboard.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4657.123.017 |
| Material | Die-cast aluminum housing with glass-filled nylon solenoid body |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 120 mm x 65 mm |
| OEM Reference | ZF 4657.123.017 |
| Operating Voltage | 12V DC (24V compatible with adapter) |
| Seal Type | Viton O-ring (integrated) |
Compatibility
This control unit is engineered for ZF WG191 and WG211 series transmissions, commonly found in medium-duty trucks, construction loaders, and agricultural tractors. It is also compatible with the WG180, WG200, and WG210 variants that share the same valve body architecture. The unit mounts directly to the HOUSING REAR PART and is secured using a CYLINDRICAL PIN for precise alignment. For full assembly, ensure the transmission housing is free of debris and that all mating surfaces are clean.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4657301130 | HOUS.FRONT SECT | Front section housing torque converter and pump |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft and control unit |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for control unit mounting |
| 0636102489 | CAP SCREW | Fastener for control unit to housing |
| 4656301148 | FIXING PLATE | Retaining plate for control unit harness |
| 0636102463 | CAP SCREW | Bolt for fixing plate attachment |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic oil return |
| 0636115287 | CAP SCREW | Bolt for screen sheet retention |
| 4657301065 | PLATE | Cover plate for control unit access port |
ZF 4657.123.017 CONTROL UNIT – Control Unit RFQ Support
PartsZF helps B2B buyers source ZF 4657.123.017 CONTROL UNIT with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This control unit page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4657.123.017 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: WG 191
- Illustration section: WG 211
- Illustration section: CONTROL UNIT
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4657.123.017 |
|---|---|
| Normalized SKU | 4657123017 |
| Part name | CONTROL UNIT |
| Product category | control unit |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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