Cleveland 40-77 Series Main Wheel Assembly - Obsidian Disc

The Cleveland 40-77 Series main wheel assembly, P/N 40-113-5, is supplied with an Obsidian brake disc. It is part of Cleveland Wheel & Brake Systems’ 40-113 main-wheel family, designed to support aircraft loads during landing and ground operation while transmitting braking forces to the ground.

The Obsidian disc uses Cleveland’s metallurgical treatment, engineered to provide extended disc life and reduce replacement frequency. The wheel’s split-rim construction supports tyre mounting, while tapered roller bearings and moulded grease seals are designed to support bearing stability and lubricant retention.

• Manufacturer: Cleveland Wheels & Brakes
• Manufacturer part number: 40-113-5
• Wheel family: 40-113 / 40-77 Series
• Wheel interface: External
• Tyre and rim size: 6.00-6
• Tyre configuration: Tube type
• Ply rating: 4 ply
• Associated brake references: 30-75 / 30-75A
• Obsidian brake disc reference: 564-04000
• Manufacturer-listed certification for the 40-113 wheel series: FAA TSO-C26a

Confirm part-number applicability, brake configuration and approved installation data for the specific aircraft before fitment.

Manufacturer documentation: Component Maintenance Manual and 40-113 Exploded View.