Overview
The ZF 6057.018.652 EST 37 A for WG160 is a precision-engineered electro-hydraulic control unit that governs clutch modulation and shift timing within the WG160 transmission series. This OEM genuine part, identified by SKU 6057.018.652, functions as the central valve body assembly, directing oil pressure to specific clutch packs based on electronic signals from the transmission control module. It sits directly atop the main gearset housing and interfaces with the TRANSMISSION HOUSING to regulate fluid flow. Without this component, the transmission cannot execute gear changes or maintain proper line pressure.
Symptoms of Failure
- Delayed or harsh shifting — When the EST 37 A solenoid pack degrades, you will notice a pronounced lag between gear selection and engagement, often accompanied by a jarring shift feel. This is a common search query for “ZF WG160 hard shift fix.”
- Intermittent loss of forward or reverse — A failing control unit may cause the transmission to suddenly drop out of gear, especially under load. Technicians frequently search for “WG160 slipping in reverse” when this occurs.
- Transmission fluid contamination — Internal wear of the valve body can introduce metallic debris into the hydraulic circuit, leading to clogged screens. This symptom often triggers searches for “ZF 6057.018.652 oil debris.”
- Erratic electronic fault codes — The transmission ECU will log solenoid-specific errors (e.g., P0748, P0753) that do not clear after a reset, indicating internal electrical failure of the EST 37 A module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6057.018.652 |
| OEM Reference | EST 37 A |
| Material | Die-cast aluminum alloy with steel solenoid cores |
| Weight | 2.85 kg (6.28 lbs) |
| Dimensions (L x W x H) | 310 mm x 180 mm x 95 mm |
| Operating Pressure | 12–18 bar |
| Temperature Range | -30°C to +120°C |
| Mounting Torque | 25 Nm (M8 bolts) |
Compatibility
This EST 37 A control unit is primarily designed for the ZF WG160 series transmissions used in heavy-duty commercial vehicles and off-highway equipment. It is also compatible with the WG180 and WG200 series when fitted with the appropriate adapter plate. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART to complete the hydraulic circuit. For WG200 applications, verify that the HOUSING REAR SECTION matches the bolt pattern of your unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101055 | TRANSMISSION HOUSING | Main structural casing for gearset and valve body |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201076 | HOUSING REAR PART | Rear section supporting output flange and bearings |
| 4656298047 | HOUSING REAR SECTION | Extended rear housing for PTO adapters |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retaining plate for solenoid harness |
| 0636100817 | CAP SCREW | M8 x 25 mm bolt for valve body attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for suction line |
| 0636100803 | CAP SCREW | M6 x 20 mm bolt for screen cover |
Frequently Asked Questions
Q: Can the ZF 6057.018.652 be repaired, or must it be replaced?
A: This is a sealed electro-hydraulic unit. While individual solenoids can sometimes be tested, internal valve body wear and corrosion typically require full replacement. We recommend replacing the unit and the two SCREEN SHEET filters simultaneously.
Q: How do I verify that this EST 37 A fits my WG160 transmission?
A: Check the casting number on your existing valve body. The 6057.018.652 supersedes earlier revisions. Ensure the HOUS.FRONT SECT and HOUSING REAR PART are free of cracks before installation.
Q: What torque specification should I use for the mounting bolts?
A: Tighten the four M8 cap screws to 25 Nm in a cross pattern. Use new CAP SCREW fasteners to prevent thread galling in the aluminum housing.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
