ZF 0730.162.612 RING | OEM Genuine Part

Overview

The ZF 0730.162.612 RING is a precision-engineered OEM genuine component designed for the internal planetary gearset of heavy-duty ZF transmissions. This ring serves as a critical load-bearing surface within the differential assembly, ensuring proper torque distribution and gear alignment under extreme operational stress. The SKU 0730.162.612 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in construction machinery drivelines. It sits between the differential housing and the axle bevel gear, acting as a hardened interface that absorbs rotational forces while maintaining concentricity.

Symptoms of Failure

When the ZF 0730.162.612 RING begins to fail, operators may notice intermittent gear slipping under load during excavation or grading operations. Another common indicator is metallic grinding noises from the transmission housing, particularly when turning at low speeds. You might also observe contaminated transmission fluid with fine metal particles during routine oil changes, signaling surface spalling on the ring. Finally, uneven tire wear on drive axles can occur if the ring’s wear alters the differential’s torque bias.

Technical Specifications

Parameter	Specification
Part Number	0730.162.612
Material	Case-hardened alloy steel (20MnCr5 equivalent)
Outer Diameter	162 mm
Inner Diameter	120 mm
Thickness	12.5 mm
Weight	0.85 kg
OEM Reference	ZF 0730.162.612
Hardness	58-62 HRC (case depth 0.8 mm)

Compatibility

This ring is primarily compatible with ZF WG180, WG200, and WG250 series powershift transmissions commonly found in wheel loaders, graders, and telehandlers. It also fits select ZF 4WG-200 and 6WG-200 models used in construction machinery from 1995 onward. For exact fitment, always cross-reference your transmission’s serial number with the 0730.162.612 part number.

Installation Context

During a differential overhaul, the 2093109002 DIFFERENTIAL assembly requires this ring to be seated correctly against the 2093309071 DIFF.HOUSING. The 0750117075 TAPER ROLLER BEARING must be pressed onto the shaft before the ring is installed, ensuring proper preload. Additionally, the 2093209095 DIFFERENTIAL unit should be inspected for wear on its mating surfaces when replacing this ring.

Related Components

Part Number	Name	Function
2093109002	DIFFERENTIAL	Distributes torque between drive wheels
0750117075	TAPER ROLLER BEARING	Supports axial and radial loads on the differential shaft
2093209095	DIFFERENTIAL	Secondary differential unit for multi-axle configurations
2093309071	DIFF.HOUSING	Encloses and supports the differential gears
0631100223	SPRING PIN	Secures ring alignment within the housing
0730300820	THRUST WASHER	Reduces axial friction between rotating components
4482360002	AXLE BEVEL GEAR	Transfers power from differential to axle shafts
2097309085	DIFFERENTIAL AXLE	Connects differential to wheel hubs
5838300811	THRUST WASHER	Provides wear surface for planetary gear thrust loads
4482360001	DIFFERENTIAL BEVEL GEAR	Drives the side gears within the differential carrier

Frequently Asked Questions

Q: Can the 0730.162.612 ring be reused after a transmission rebuild?
A: No. This ring undergoes case hardening and will have surface fatigue after service. Always replace it with a new OEM genuine part to avoid premature differential failure.

Q: How do I verify the correct orientation of this ring during installation?
A: The ring has a chamfered inner edge that must face the taper roller bearing. The flat side should sit flush against the differential housing shoulder. Refer to your ZF service manual for torque specifications.

Q: Does this part fit ZF 4WG-310 transmissions?
A: No. The 0730.162.612 is designed for WG180 through WG250 series only. For 4WG-310 models, use the larger 0730.165.412 ring instead.