Overview
The ZF 4657.123.003 CONTROL UNIT is a precision electronic module that governs shift timing and hydraulic pressure within the WG190 transmission series. Positioned on the valve body assembly, this OEM genuine part interprets input from speed sensors and the driver’s command to engage clutches and bands at the exact moment required. The SKU 4657.123.003 is engineered to withstand high thermal loads and vibration, ensuring consistent performance in heavy-duty industrial applications. When paired with a robust TRANSMISSION HOUSING, this control unit forms the core of reliable gearbox operation.
Symptoms of Failure
- Erratic shifting or delayed engagement: A worn control unit often causes the transmission to hesitate before moving into gear, particularly when cold.
- Intermittent gear slipping under load: The unit may fail to maintain proper line pressure, leading to momentary loss of power during acceleration.
- Unexpected limp-home mode activation: Faulty internal circuitry can trigger safety protocols, forcing the transmission into a single gear.
- Oil contamination from degraded seals: Leaking fluid around the control unit connector can mix with debris, accelerating wear on the HOUS.FRONT SECT and adjacent components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.123.003 |
| Material | Die-cast aluminum with sealed electronics |
| Weight | 1.8 kg (approx.) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 55 mm |
| OEM Reference | ZF 4657.123.003 |
| Operating Voltage | 12V / 24V DC |
| Temperature Range | -40°C to +120°C |
Compatibility
This control unit is designed for ZF WG190, WG180, WG200, and WG210 transmission models. It also fits the BP 210 Series and WG 230 Series when used with the correct HOUSING REAR PART. Always verify the mounting flange pattern and connector type before installation. The unit integrates directly with the CYLINDRICAL PIN alignment system to ensure precise positioning.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Encloses gear train and supports control unit mounting |
| 4657201028 | HOUS.FRONT SECT | Front section housing pump and torque converter interface |
| 4657201013 | HOUSING REAR PART | Rear section supporting output shaft and bearing assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-control unit fit |
| 0636100801 | CAP SCREW | Fastener for securing control unit to valve body |
| 4656301148 | FIXING PLATE | Retains control unit harness and prevents vibration loosening |
| 4657301034 | SCREEN SHEET | Fine mesh filter protecting control unit oil passages |
| 4657301035 | SCREEN SHEET | Secondary filter for high-pressure circuit |
| 0636100803 | CAP SCREW | Bolt for housing-to-control unit attachment |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to control unit solenoids |
Frequently Asked Questions
Q: Can the 4657.123.003 control unit be repaired, or must it be replaced?
A: This OEM genuine part is sealed and non-serviceable. Internal electronic failure requires full replacement to restore proper shift quality and avoid damage to the TRANSMISSION HOUSING.
Q: How do I confirm compatibility with my WG190 transmission?
A: Check the production date and serial number on your transmission nameplate. The 4657.123.003 is compatible with all WG190 units using the CYLINDRICAL PIN alignment system and 12-pin connector.
Q: What causes premature failure of this control unit?
A: Common causes include contaminated transmission fluid, excessive heat from a failing torque converter, or physical damage from a loose HOUSING REAR PART that allows vibration to reach the electronics.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
ZF 4657.123.003 CONTROL UNIT – Control Unit RFQ Support
PartsZF helps B2B buyers source ZF 4657.123.003 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 4657.123.003 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657023001
- Documentation reference: 4657023004
- Documentation reference: 4657023100
- Documentation reference: 4657023101
- Illustration section: WG 190
- Illustration section: WG 210
- 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 | 4657.123.003 |
|---|---|
| Normalized SKU | 4657123003 |
| 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 4657.123.006 CONTROL UNIT
- ZF 4657.123.016 CONTROL UNIT
- ZF 4656.123.008 CONTROL UNIT
- ZF 4656.123.002 CONTROL UNIT
