ZF 2093.070.028 TRA 20 | OEM Genuine Part

Overview

This OEM genuine ZF 2093.070.028 TRA 20 is a critical internal component designed for the final drive assembly in heavy-duty construction machinery transmissions. It functions as a precision-machined spacer and alignment element within the differential housing, ensuring correct gear mesh and axial load distribution. The SKU 2093.070.028 sits directly between the differential side gears and the housing bore, maintaining proper clearance for the 2093109028 DIFFERENTIAL assembly. Without this part, the entire drivetrain loses its geometric integrity, leading to accelerated wear on adjacent components.

Symptoms of Failure

• Progressive oil seepage from the axle housing flange: When the 2093.070.028 wears or deforms, the seal surface becomes compromised, causing transmission fluid to weep around the differential cover. This is a common long-tail search query for “ZF final drive oil leak repair.”
• Low-speed gear grinding under load: A worn TRA 20 allows the 0750117075 TAPER ROLLER BEARING to shift axially, creating intermittent metal-on-metal contact during excavation or grading operations.
• Vibration in the driveline during turns: Loss of preload from this part causes the 2093209094 DIFFERENTIAL to wobble, transmitting harsh vibrations through the chassis that operators often describe as “axle chatter.”
• Premature failure of the differential housing: If ignored, the misalignment can crack the 2093309078 DIFF.HOUSING, requiring a complete axle overhaul.

Technical Specifications

Compatibility

This TRA 20 spacer is engineered for ZF’s WG series powershift transmissions commonly used in wheel loaders and graders. It is a direct fit for the WG180, WG200, and WG210 models. It also appears in certain ZF 4WG-200 and ZF 6WG-250 final drive assemblies. Always verify the differential stack height when replacing this part alongside the 2093109028 DIFFERENTIAL to maintain proper bearing preload.

Related Components

Frequently Asked Questions

Q: Can I reuse the old TRA 20 spacer if it looks clean?
A: No. The ZF 2093.070.028 is a crush-type spacer that loses its dimensional stability after the first torque cycle. Always replace it with a new OEM unit to maintain proper bearing preload on the 0750117075 TAPER ROLLER BEARING.

Q: What tools are needed to install this part?
A: You will need a hydraulic press and a dial indicator to measure the differential stack height. The spacer must be compressed to a specific thickness (12.7 mm ±0.05 mm) to achieve the correct rotating torque on the differential assembly.

Q: Does this part fit ZF 4WG-180 transmissions?
A: Yes. The 2093.070.028 is compatible with the WG180, WG200, and WG210 series. However, always cross-reference your transmission serial number against the 2093109028 DIFFERENTIAL part number to confirm stack height requirements.