Overview
The ZF 6073.015.137 EST 37 A for WG210 is a critical electro-hydraulic control unit designed to manage clutch pressure and shift timing within the WG 210 series transmission. This OEM genuine part, identified by SKU 6073.015.137, directly interfaces with the valve body to regulate oil flow, ensuring smooth gear engagement under heavy load conditions. It is mounted internally within the main casing, working in concert with the TRANSMISSION HOUSING to maintain hydraulic integrity. Without this component, the transmission cannot execute commanded shifts reliably.
Symptoms of Failure
- Delayed or harsh shifting under load: When the EST 37 A wears, internal spools stick, causing abrupt gear changes or a noticeable lag when accelerating, especially in WG210 applications.
- Intermittent loss of drive in forward gears: A failing unit can cause pressure drops, leading to the transmission slipping out of gear during operation, often misdiagnosed as a torque converter issue.
- Erratic shift patterns and limp mode activation: The control module detects abnormal pressure signals from a degraded EST 37 A, forcing the transmission into a protective limp-home mode with limited gear access.
- Contaminated transmission fluid with metallic debris: Internal wear of the solenoid plunger or valve bore generates fine metal particles, visible during oil changes, indicating imminent failure of the 6073.015.137.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.137 |
| OEM Reference | ZF EST 37 A |
| Material | Hard-anodized aluminum body with steel spool |
| Weight | 0.85 kg (1.87 lbs) |
| Operating Pressure | 8–18 bar (116–261 psi) |
| Seal Type | Nitrile rubber O-rings (included) |
| Compatible Housing | HOUS.FRONT SECT and HOUSING REAR PART |
| Fastener Torque | 25 Nm (18.4 lb-ft) with CYLINDRICAL PIN alignment |
Compatibility
This EST 37 A unit is engineered for the ZF WG 210 series, but it also fits select variants of the WG180 and WG200 transmissions due to shared valve body architecture. It is not backward-compatible with older WG120 models. For proper installation, ensure the TRANSMISSION HOUSING is free of scoring and that the CYLINDRICAL PIN is replaced to guarantee precise alignment of the control bore. Always verify the serial number against your transmission tag before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101075 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201151 | HOUS.FRONT SECT | Front section enclosing the torque converter |
| 4657201160 | HOUSING REAR PART | Rear section supporting output shaft bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for valve body positioning |
| 0636100801 | CAP SCREW | M8 fastener for housing retention |
| 4656301148 | FIXING PLATE | Locks the EST 37 A in place |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil intake |
| 0636100803 | CAP SCREW | M6 fastener for valve body cover |
| 0750301003 | OIL FEED.HOUSG. | Pressurized oil supply conduit |
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