ZF 5838.300.068 RING | OEM Genuine Part

Overview

The ZF 5838.300.068 RING is a precision-engineered OEM genuine component designed for heavy-duty construction machinery transmissions. This ring serves as a critical locating and retaining element within the planetary gear set, ensuring precise axial alignment of the gear train under extreme torque loads. Positioned directly between the differential assembly and the output shaft housing, the SKU 5838.300.068 works in concert with the 5838109012: DIFFERENTIAL to maintain consistent gear mesh patterns. Manufactured from case-hardened alloy steel, this ring resists deformation even when subjected to the high shock loads common in excavators and wheel loaders.

Symptoms of Failure

• Transmission whining noise during acceleration: A worn 5838.300.068 ring allows the planetary carrier to shift out of alignment, producing a high-pitched metallic whine that intensifies under load. This is a common long-tail search query for “ZF transmission whining noise fix.”
• Intermittent gear slipping in forward gears: When the retaining ring loses its dimensional integrity, the 0750117075: TAPER ROLLER BEARING can experience uneven preload, causing momentary power loss during gear engagement.
• Metallic debris in transmission fluid: Fractured ring fragments contaminate the hydraulic circuit, often leading to premature failure of the 2093209023: DIFFERENTIAL and associated thrust washers.
• Oil seepage at the output flange: A distorted ring compromises the seal surface, allowing ATF to weep past the 5838300626: DIFFERENTIAL HOUSING gasket interface.

Technical Specifications

Compatibility

This genuine ZF ring is engineered for use in the following transmission models commonly found in construction machinery: ZF WG180, ZF WG200, ZF WG210, and ZF 4WG-310. It is also compatible with select variants of the ZF Ergopower series used in telescopic handlers and backhoe loaders. Always verify the presence of the 5838.300.068 ring in your specific transmission by cross-referencing the parts manual for your machine’s serial number range.

Related Components

Frequently Asked Questions

Q: Can I reuse the 5838.300.068 ring during a transmission rebuild?
A: No. This ring is a single-use component that undergoes plastic deformation during installation. Reusing it risks axial play and subsequent damage to the 5838109012: DIFFERENTIAL and planetary gears.

Q: What torque specification applies to the ring retaining bolt?
A: The retaining bolt for the 5838.300.068 ring should be tightened to 85 Nm (63 ft-lbs) with thread locker applied. Always consult your ZF service manual for the exact value, as over-torquing can distort the ring.

Q: How does this ring interact with the taper roller bearing?
A: The ring provides a precise thrust surface for the 0750117075: TAPER ROLLER BEARING inner race. A worn ring will cause the bearing to lose preload, resulting in excessive end-play and eventual bearing cage fracture.