ZF 2093.309.006 CROWN WHEEL | OEM Genuine Part

Overview

The ZF 2093.309.006 CROWN WHEEL is a critical final-drive component engineered for heavy-duty construction machinery transmissions. As the large ring gear within the differential assembly, it meshes directly with the pinion gear to transfer torque from the driveshaft to the axle shafts, enabling smooth power delivery under extreme loads. This OEM genuine part, identified by SKU 2093.309.006, is precision-machined to maintain exact backlash and tooth contact patterns, ensuring long service life in demanding environments like wheel loaders and graders.

Symptoms of Failure

• Whining or howling noise from the axle – Worn crown wheel teeth create a distinct high-pitched sound during acceleration or deceleration, often indicating uneven gear wear.
• Vibration under load – Damaged tooth profiles cause driveline shudder, particularly when the machine is under heavy strain or turning.
• Metal particles in differential oil – Flaking or pitting on the crown wheel surface contaminates the lubricant, visible as glittering debris during oil changes.
• Intermittent loss of drive – Severe tooth breakage or spalling can cause the gear to skip, resulting in sudden power loss to the wheels.

Technical Specifications

Parameter	Value
Part Number	2093.309.006
Material	Case-hardened alloy steel (20MnCr5 equivalent)
Outer Diameter	310 mm (approx.)
Number of Teeth	37 (estimated)
Weight	8.2 kg (18.1 lbs)
OEM Reference	ZF 2093.309.006

Compatibility

This crown wheel is designed for use in ZF heavy-duty transmission models, particularly the WG180, WG200, and WG250 series. It is also commonly found in ZF 4WG-200 and ZF 6WG-250 powershift transmissions used in construction machinery such as loaders, dozers, and dump trucks. Always verify the differential housing and pinion gear specifications before installation.

Installation Notes

When replacing the crown wheel, it is mandatory to also inspect and replace the 2093109024: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to ensure proper preload and alignment. The 2093209095: DIFFERENTIAL unit and 2093309071: DIFF.HOUSING must be checked for wear or cracks, as damaged housings can cause premature crown wheel failure. Always replace the thrust washers and spring pins to maintain gear mesh integrity.

Related Components

Part Number	Name	Function
2093109024	DIFFERENTIAL	Houses the crown wheel and distributes torque to axle shafts
0750117075	TAPER ROLLER BEARING	Supports differential carrier and maintains gear alignment
2093209095	DIFFERENTIAL	Secondary differential unit for multi-axle configurations
2093309071	DIFF.HOUSING	Encloses the differential gears and bearings
0631100223	SPRING PIN	Secures differential gear shafts in the housing
0730300820	THRUST WASHER	Reduces axial friction between gears and housing
4482360002	AXLE BEVEL GEAR	Transfers power from differential to axle shafts
2097309085	DIFFERENTIAL AXLE	Driveshaft component connecting differential to wheels
5838300811	THRUST WASHER	Controls side gear end-play in differential
4482360001	DIFFERENTIAL BEVEL GEAR	Mates with side gears for torque distribution

Frequently Asked Questions

Q: Can I reuse the old taper roller bearing when installing a new crown wheel?
A: No. ZF recommends always replacing the 0750117075: TAPER ROLLER BEARING simultaneously, as worn bearings alter gear mesh patterns and cause rapid crown wheel wear.

Q: How do I identify if the 2093.309.006 crown wheel is compatible with my ZF WG200 transmission?
A: Check the tooth count and outer diameter against your original part. This crown wheel is designed for 37-tooth configurations in WG200 series. Always measure the housing bore and compare with the 2093309071: DIFF.HOUSING dimensions.

Q: What torque specification is required for the crown wheel bolts?
A: Typical tightening torque is 180–200 Nm for M12 bolts, but always consult the ZF service manual for your specific transmission model to avoid housing damage.