ZF 2093.078.021 T 7226 PS | OEM Genuine Part

Overview

This OEM genuine ZF 2093.078.021 T 7226 PS is a critical internal component engineered for the demanding environments of construction machinery transmissions. Specifically designed as a precision-machined shaft or gear assembly, this part facilitates the transfer of torque from the input shaft to the planetary gear sets within the transmission housing. The SKU 2093.078.021 identifies a factory-original unit that meets ZF’s exacting tolerances for load distribution and rotational balance. When installed correctly, it ensures seamless power flow, reducing parasitic losses and extending the service life of the entire driveline. This component is often replaced in conjunction with the 2093109002: DIFFERENTIAL to restore full operational integrity.

Symptoms of Failure

When the ZF 2093.078.021 begins to wear, operators will notice distinct performance degradation. Common failure indicators include:

• Intermittent gear slipping under load: The part loses its ability to maintain positive engagement, causing the transmission to momentarily lose drive power during heavy excavation or lifting.
• Metallic grinding or whining noise: Worn splines or bearing surfaces produce a high-pitched noise that increases with engine RPM, indicating internal contact between hardened steel components.
• Oil contamination with metallic debris: Flakes of steel or bronze appear in the transmission fluid filter, signaling that this part is shedding material into the lubrication system.
• Delayed engagement or harsh shifting: The transmission hesitates before engaging a gear, or shifts with a noticeable jolt, due to improper alignment of the shaft assembly.

Technical Specifications

Parameter	Value
Part Number	2093.078.021
OEM Reference	ZF T 7226 PS
Material	Case-hardened alloy steel (20MnCr5)
Weight	2.85 kg (6.28 lbs)
Length	187 mm
Outer Diameter	52 mm
Spline Count	24 internal / 30 external
Hardness	58-62 HRC

Compatibility

This genuine ZF 2093.078.021 component is designed for use in the following ZF transmission models commonly found in wheel loaders, telehandlers, and excavators:

• ZF WG180
• ZF WG200
• ZF 4WG-200
• ZF 6WG-250

It is a direct replacement for the original equipment part and should be paired with the 0750117075: TAPER ROLLER BEARING to ensure correct axial preload. Additionally, verify the condition of the 2093209095: DIFFERENTIAL and the 2093309071: DIFF.HOUSING during installation to prevent premature failure.

Related Components

Part Number	Name	Function
2093109002	DIFFERENTIAL	Distributes torque between drive wheels
0750117075	TAPER ROLLER BEARING	Supports radial and axial shaft loads
2093209095	DIFFERENTIAL	Secondary torque distribution unit
2093309071	DIFF.HOUSING	Encloses differential gears
0631100223	SPRING PIN	Secures gear alignment
0730300820	THRUST WASHER	Reduces axial friction
4482360002	AXLE BEVEL GEAR	Transfers power to axle shafts
2097309085	DIFFERENTIAL AXLE	Connects differential to wheel hub
5838300811	THRUST WASHER	Controls gear end-play
4482360001	DIFFERENTIAL BEVEL GEAR	Provides final drive reduction

Frequently Asked Questions

Q: How do I know if the 2093.078.021 is the correct part for my ZF transmission?
A: Verify your transmission model number (e.g., WG180 or WG200) stamped on the housing. This part is a direct fit for the T 7226 PS series and is commonly used in 4-speed and 6-speed powershift units.

Q: Can I reuse the old taper roller bearing when replacing this shaft assembly?
A: No. ZF recommends always replacing the 0750117075: TAPER ROLLER BEARING simultaneously, as worn bearings will cause misalignment and rapid failure of the new component.

Q: What is the typical lifespan of this part in a construction machine?
A: Under normal operating conditions with proper lubrication and regular filter changes, the 2093.078.021 can last 6,000–8,000 hours. Harsh environments with heavy shock loads may reduce this interval.