ZF Retaining Ring

ZF Retaining Ring

This genuine ZF retaining ring (circlip) is a critical internal fastener used to secure the main bearing in ZF drum drive gearboxes, including the P-3301, P-4300, P-5300, P-7300, and PK-6500 models. Measuring 180mm in diameter and 4mm in thickness, it provides secure axial retention under the heavy loads experienced by concrete mixer trucks. Replacing worn or damaged retaining rings during a gearbox rebuild is essential to prevent main bearing movement and ensure the long-term reliability of the drum drive system.

Key Features

• Secures the main bearing within the drum drive gearbox housing
• 180mm diameter x 4mm thickness for precise OEM fitment
• Manufactured from high-strength spring steel for maximum axial load retention
• Essential replacement component during ZF gearbox rebuilds

Fits These Mixers

ZF, Rex, PMP, Challenge, Bonfiglioli. Fits ZF concrete mixer drum drive gearboxes, including models P-3301, P-4300, P-5300, P-7300, and PK-6500. Commonly found on McNeilus rear discharge mixers equipped with ZF hydraulic drum drives.

All measurements ± standard manufacturing tolerance.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.