Overview
The ZF 6057.018.949 EST 37 A for WG210 is a critical electro-hydraulic control unit that governs clutch engagement and shift timing within the WG 210 Series transmission. This OEM genuine part, identified by SKU 6057.018.949, functions as the central valve body assembly, directing oil pressure to specific clutches and brakes to facilitate smooth gear changes under load. It integrates directly with the main transmission casing and must be paired with the TRANSMISSION HOUSING to ensure proper sealing and alignment of hydraulic circuits. Without this component, the transmission cannot modulate pressure for forward or reverse operation.
Symptoms of Failure
- Delayed or harsh shifting: When the EST 37 A wears, internal spools stick, causing noticeable lag between gear selections or jarring engagements during acceleration.
- Intermittent loss of drive: A failing unit may cause the transmission to suddenly drop into neutral or fail to engage a specific gear, especially after reaching operating temperature.
- Hydraulic fluid contamination: Debris from worn valve components can circulate through the system, leading to clogged screens and erratic pressure readings across the HOUS.FRONT SECT and rear sections.
- Erratic pressure regulation: Operators may notice surging or slipping under constant throttle, indicating the EST 37 A can no longer maintain consistent line pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6057.018.949 |
| Designation | EST 37 A (Electro-Hydraulic Control Unit) |
| Material | High-grade aluminum alloy with hardened steel spools |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 320 mm x 180 mm x 95 mm |
| OEM Reference | ZF 6057.018.949 |
| Operating Pressure Range | 12–18 bar |
| Seal Type | Nitrile rubber O-rings (included) |
Compatibility
This genuine ZF part is specifically engineered for the WG 210 Series, but it also fits select variants within the WG180, WG200, and WG250 families when used with the correct HOUSING REAR PART and HOUSING REAR SECTION. Always verify the valve body casting number against your transmission’s serial plate. The EST 37 A is not backward-compatible with older WG150 units without significant hydraulic modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101079 | TRANSMISSION HOUSING | Main casing that encloses gear sets and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing the torque converter interface |
| 4657201169 | HOUSING REAR PART | Rear housing supporting output shaft bearings |
| 4657298104 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for valve body positioning |
| 0636100801 | CAP SCREW | M8 fastener for securing valve body to housing |
| 4656301148 | FIXING PLATE | Retaining plate for solenoid harness |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M10 fastener for housing flange connection |
Frequently Asked Questions
Q: Can the ZF 6057.018.949 be rebuilt, or must it be replaced entirely?
A: While some technicians attempt to replace individual spools and springs, ZF recommends full replacement of the EST 37 A assembly due to tight manufacturing tolerances. Reusing a worn valve body often leads to recurring shift quality issues.
Q: Does this part require reprogramming after installation?
A: No. The 6057.018.949 is a purely hydraulic control unit with no electronic memory. However, you must perform a full transmission fluid flush and replace all screens (such as 4657301032 and 4657301033) to prevent debris from damaging the new unit.
Q: What torque specification applies to the cap screws securing this valve body?
A: Use 25 Nm for the CAP SCREW (M8) and 45 Nm for the CAP SCREW (M10). Always tighten in a crosswise pattern to avoid warping the valve body.
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