ZF 4657.025.111 for WG190 | OEM Genuine Part

Overview

This genuine OEM ZF 4657.025.111 component is a critical internal structural element engineered specifically for the WG 190 Series transmission. Designed to maintain precise alignment and oil flow within the gear train, this part ensures consistent hydraulic pressure and torque transfer under heavy-duty industrial loads. The SKU 4657.025.111 interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a sealed, vibration-resistant assembly. As an OEM genuine part, it meets ZF’s exacting tolerances for material hardness and dimensional stability, making it the preferred choice for rebuilds and preventive maintenance programs.

Symptoms of Failure

• Gradual oil seepage around the mid-case seam: When the 4657.025.111 loses its sealing integrity, transmission fluid may weep from the joint between the HOUSING REAR PART and the main housing, leading to low fluid levels and eventual overheating.
• Intermittent gear slipping under load: A worn or distorted part can cause misalignment of the clutch packs, resulting in delayed engagement or sudden loss of drive torque during uphill or loaded operation.
• Abnormal metallic rattling from the bell housing area: If the component fractures or fatigues, loose fragments may contact rotating gears, producing a distinct rattle that worsens with RPM changes.
• Hard shifting or delayed reverse engagement: Hydraulic circuit disruption caused by a compromised 4657.025.111 often manifests as sluggish shifts, particularly when the transmission is cold.

Technical Specifications

Compatibility

This genuine ZF 4657.025.111 is primarily designed for the WG 190 Series transmission, but it also fits select variants of the WG180, WG200, and WG210 models produced after 2012. It is not backward-compatible with the earlier WG170 series due to differences in the HOUSING REAR SECTION mounting flange geometry. Always verify your transmission serial number against the OEM parts catalog before ordering.

Related Components

Frequently Asked Questions

Q: Can the 4657.025.111 be reused if it shows no visible cracks?
A: ZF recommends replacing this part whenever the transmission is fully disassembled, as microscopic stress fractures can develop over time. Reusing it risks sudden failure under high torque.

Q: Does this part require any special sealant during installation?
A: Yes. Apply a thin, even layer of ZF-approved anaerobic flange sealant (Part No. 0636100801) to both mating surfaces. Do not use silicone-based sealants as they can clog oil passages.

Q: How do I confirm this part fits my WG190 transmission?
A: Locate the transmission serial number on the data plate (usually on the left side of the housing). Cross-reference it with the OEM parts catalog. If the serial number begins with “WG190-“, this part is compatible.