ZF 2099.109.043 DIFFERENTIAL | OEM Genuine Part

Overview

The ZF 2099.109.043 DIFFERENTIAL is a critical torque-distributing assembly within the final drive of heavy-duty construction machinery transmissions. This OEM genuine part sits directly between the axle shafts and the ring gear, allowing the left and right wheels to rotate at different speeds during turns while maintaining constant tractive effort. The SKU 2099.109.043 is engineered to handle extreme torsional loads in ZF power-shift transmissions, ensuring smooth power delivery to the ground in wheel loaders, graders, and dump trucks. Without this differential, the driveline would bind during cornering, causing severe stress on axles and tires.

Symptoms of Failure

• Chattering or grinding noise during low-speed turns – Worn internal gears cause harsh metallic sounds when the differential spider gears engage, often mistaken for axle bearing failure.
• Uneven tire wear and reduced traction – A failing 2099.109.043 differential cannot properly split torque, leading to one wheel spinning excessively on loose surfaces while the other remains stationary.
• Oil leaks from the differential housing seam – Degraded seals or housing cracks allow hypoid gear oil to escape, visible as drips near the axle center section after operation.
• Vibration under load at highway speeds – Worn cross-shaft journals or damaged thrust washers create imbalance, transmitting vibration through the chassis during transport.

Technical Specifications

Compatibility

This differential is designed for ZF WG series transmissions commonly used in construction machinery. It directly fits the WG180, WG200, and WG250 models found in brands like Liebherr, Volvo, and Caterpillar wheel loaders. It also serves as a replacement in certain ZF 4WG-200 and ZF 6WG-250 powershift units. Always verify the housing casting number before installation, as the 2099.109.043 differential requires specific DIFF.HOUSING geometry.

During rebuild, the differential assembly must be paired with a TAPER ROLLER BEARING on each side to support axial loads. The cross-shaft is secured using a SPRING PIN to prevent rotation. For complete axle overhaul, consider the DIFFERENTIAL variant used in heavier-duty applications.

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