Overview
The ZF 4657.123.006 CONTROL UNIT is a critical electronic management module for the WG190 and related ZF powershift transmission series. Positioned directly on the valve body assembly, this OEM genuine part governs hydraulic pressure modulation, shift timing, and clutch engagement sequences. The SKU 4657.123.006 acts as the central command interface between the vehicle’s ECU and the transmission’s internal solenoids, ensuring precise gear changes under load. Without a functioning control unit, the transmission cannot execute commanded shifts, making this component essential for drivability and operational safety in heavy-duty industrial applications.
Symptoms of Failure
- Erratic or delayed gear engagement – When the control unit begins to fail, operators often report a noticeable lag between shifting the lever and the transmission responding, particularly when moving from neutral into forward or reverse.
- Intermittent transmission slipping under load – A worn 4657.123.006 can cause clutch packs to receive inconsistent pressure signals, leading to momentary power loss during uphill climbs or heavy hauling.
- Unexpected fault codes or warning lights – The control unit may generate false diagnostic trouble codes (DTCs) for solenoids or speed sensors, even when those components test within specification.
- Harsh or jarring shift quality – Failed internal circuitry can cause abrupt clutch application, resulting in driveline shock and increased wear on the TRANSMISSION HOUSING and associated mounts.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.123.006 |
| OEM Reference | ZF 4657 123 006 |
| Material | Die-cast aluminum with sealed electronic board |
| Weight | 1.8 kg (approx.) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 55 mm |
| Operating Voltage | 12V / 24V DC |
| Connector Type | 24-pin AMP / Deutsch compatible |
Compatibility
This OEM genuine control unit is designed primarily for the ZF WG190 transmission series. Based on its electronic architecture and valve body interface, the 4657.123.006 is also compatible with the WG180, WG200, BP 210, BP 230, and WG 230 series. It directly replaces earlier revision control units in these models. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are free of debris and corrosion. The unit is secured using a CYLINDRICAL PIN for precise alignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101031 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing pump and clutch |
| 4657201020 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for valve body cover |
| 4656301148 | FIXING PLATE | Retains control unit to housing |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | Fastener for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil supply manifold |
Frequently Asked Questions
Q: Can the 4657.123.006 be repaired, or must it be replaced?
A: Due to the sealed electronic design and proprietary firmware, ZF recommends replacement rather than repair. Attempting to open the unit often damages the internal circuit board and voids any warranty.
Q: How do I verify that my WG190 transmission uses this exact control unit?
A: Check the original part number stamped on the metal tag attached to the valve body. If the number matches 4657.123.006, it is a direct fit. Cross-reference with your vehicle’s VIN or transmission serial number for absolute confirmation.
Q: What other parts should be inspected when replacing the control unit?
A: Always examine the FIXING PLATE for cracks and replace the SCREEN SHEET filters to prevent debris from damaging the new unit.
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ZF 4657.123.006 CONTROL UNIT – Control Unit RFQ Support
PartsZF helps B2B buyers source ZF 4657.123.006 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 4657.123.006 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657023002
- Documentation reference: 4657023104
- Documentation reference: 4657023105
- Documentation reference: 4657024018
- Illustration section: WG 210
- Illustration section: WG 190
- Illustration section: WG 230
- 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 | 4657.123.006 |
|---|---|
| Normalized SKU | 4657123006 |
| Part name | CONTROL UNIT |
| Product category | control unit |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: diagram. 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.
Related Parts
- ZF 6057.014.084 CONTROL UNIT
- ZF 4657.123.003 CONTROL UNIT
- ZF 4657.123.016 CONTROL UNIT
- ZF 4656.123.008 CONTROL UNIT
- ZF 4656.123.002 CONTROL UNIT
