ZF 2093.303.021 FLANGE BUSH | OEM Genuine Part

Overview

The ZF 2093.303.021 FLANGE BUSH is a precision-engineered OEM genuine component designed to serve as a critical interface within the final drive assembly of heavy-duty construction machinery transmissions. This flange bush acts as a wear-resistant bearing surface, supporting rotating shafts and maintaining precise axial alignment under extreme loads. Located between the differential housing and the axle shaft, it reduces friction and prevents metal-to-metal contact during high-torque operations. The SKU 2093.303.021 is manufactured to ZF’s exacting tolerances, ensuring a seamless fit and long service life in demanding environments such as wheel loaders, graders, and excavators.

Symptoms of Failure

• Oil leaks around the axle housing: A worn flange bush compromises the seal surface, allowing transmission fluid to seep past the differential housing and accumulate near the wheel hub.
• Abnormal gear whine or grinding noise: When the bush loses its dimensional integrity, the axle shaft develops excessive play, causing misalignment of the DIFFERENTIAL gears and producing a distinct metallic noise during turns.
• Vibration in the driveline under load: Degraded bush material fails to dampen torsional forces, transmitting vibration through the TAPER ROLLER BEARING assembly and into the operator cabin.
• Premature tire wear or uneven tracking: Axial play from a failed flange bush alters the wheel’s camber angle, leading to rapid, scalloped wear on drive tires.

Technical Specifications

Parameter	Value
Part Number (SKU)	2093.303.021
Material	Steel-backed sintered bronze with PTFE overlay
Outer Diameter (OD)	85.0 mm (est.)
Inner Diameter (ID)	65.0 mm (est.)
Overall Length	40.0 mm (est.)
Flange Thickness	8.0 mm (est.)
Weight	0.35 kg (est.)
OEM Reference	ZF 2093.303.021

Compatibility

This flange bush is primarily used in ZF’s heavy-duty transmission families designed for construction and agricultural machinery. Based on its part number structure and application, the 2093.303.021 is compatible with the following ZF transmission models:

• ZF WG180
• ZF WG200
• ZF WG211
• ZF WG310
• ZF WG320

It is frequently replaced in conjunction with the DIFFERENTIAL assembly and the DIFFERENTIAL HOUSING to restore full driveline integrity.

Related Components

Part Number	Name	Function
5838109012	DIFFERENTIAL	Distributes torque between axle shafts
0750117075	TAPER ROLLER BEARING	Supports radial and axial loads on the differential
2093209023	DIFFERENTIAL	Alternate differential assembly for specific ratios
5838300626	DIFFERENTIAL HOUSING	Encloses and supports differential gears
0631329088	SPRING PIN	Secures components against rotational movement
5838300811	THRUST WASHER	Controls axial end-play in the differential
5838300721	AXLE BEVEL GEAR	Transfers power from differential to axle shaft
5838300633	AXLE	Transmits rotational force to the wheel hub
5838300753	THRUST WASHER	Provides wear surface for bevel gear thrust face
5838300818	THRUST WASHER	Alternate thickness for differential adjustment

Frequently Asked Questions

Q: How do I know if the 2093.303.021 flange bush needs replacement?
A: Inspect for visible scoring on the inner bore, measure the inner diameter for wear beyond 0.15 mm, and check for radial play between the bush and the axle shaft. Any oil seepage from the housing joint also indicates replacement is necessary.

Q: Can this flange bush be installed without removing the differential housing?
A: No. The bush is pressed into the differential housing bore and requires full removal of the DIFFERENTIAL HOUSING assembly for proper extraction and installation using a hydraulic press.

Q: Is the 2093.303.021 interchangeable with any aftermarket bush?
A: Only the OEM genuine ZF part guarantees the correct interference fit and material composition. Aftermarket alternatives often use softer bronze that accelerates wear and can damage the DIFFERENTIAL housing bore.