Overview
The ZF 6073.015.123 EST 37 A for WG210 is a precision-engineered solenoid valve assembly that modulates hydraulic pressure within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.123, sits directly on the valve body of the WG 210 series, governing clutch engagement and shift timing. It converts electrical signals from the transmission control module into precise hydraulic actions, ensuring smooth gear transitions under heavy load. Without this component, the transmission cannot maintain proper line pressure, leading to erratic shifting behavior.
Symptoms of Failure
- Delayed or harsh shifting: When the EST 37 A fails, you may notice a pronounced lag between gear changes or a jarring thud during upshifts, especially under acceleration.
- Transmission slipping in higher gears: A worn solenoid often causes the WG210 to lose hydraulic grip, resulting in RPM flare without corresponding vehicle speed increase.
- Intermittent limp mode activation: The transmission may unexpectedly default to a single gear (usually 3rd) as the control module detects abnormal pressure readings from this valve.
- Erratic pressure fluctuations: You might observe surging or bucking at steady throttle, indicating the solenoid is failing to regulate oil flow consistently.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.123 |
| OEM Reference | EST 37 A |
| Material | Hardened steel spool with aluminum housing |
| Weight | 0.42 kg (0.93 lbs) |
| Operating Voltage | 12V DC (PWM controlled) |
| Seal Type | Nitrile rubber O-rings (included) |
| Torque Spec | 8 Nm (5.9 lb-ft) |
Compatibility
This solenoid is primarily designed for the ZF WG 210 series, but it also fits select variants of the WG180 and WG200 transmissions used in medium-duty trucks and construction equipment. The EST 37 A valve is interchangeable across WG200, WG180, and WG210 models that share the same valve body architecture. Always verify your transmission serial number before installation. For full assembly integrity, this part works in conjunction with the TRANSMISSION HOUSING (4657101082), which encloses the valve body, and the HOUS.FRONT SECT (4657201166) that supports the solenoid mounting plate. Additionally, the HOUSING REAR PART (4657201170) and HOUSING REAR SECTION (4657298102) provide structural alignment for the hydraulic circuits this valve controls.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural enclosure for valve body assembly |
| 4657201166 | HOUS.FRONT SECT | Front section supporting solenoid mounting |
| 4657201170 | HOUSING REAR PART | Rear housing for hydraulic circuit alignment |
| 4657298102 | HOUSING REAR SECTION | Additional rear section for pressure regulation |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing positioning |
| 0636100801 | CAP SCREW | Fastener for solenoid bracket |
| 4656301148 | FIXING PLATE | Retains solenoid in valve body |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter for debris protection |
| 0636100803 | CAP SCREW | Mounting bolt for rear housing section |
