7S8561 NBR (75) O-Ring for Caterpillar Equipment — SKU 7S8561

The 7S8561 O-ring is a nitrile rubber sealing ring for fixed and selected moving sealing points on Caterpillar equipment. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The seal is identified by the Caterpillar equipment part number 7S-8561 and is used across several Caterpillar machine types, including tracked bulldozers, motor graders, wheel bulldozers, wheeled tractor-scrapers, pipe-layers, wheel loaders, earthwork compactors, cold planers and forest machines. The correct application should be verified against the machine model and the dimensions of the existing seal.

Fitment

• Tracked bulldozers: D7R II, D7R, D8R II
• Motor graders: 120M, 120M 2, 12M 2, 12M 3 AWD, 140, 140M, 140B, 140M 2, 140M 3 AWD
• Wheel bulldozer: 834B
• Wheeled tractor-scraper: 613
• TR53: listed in the source application data under solutions for equipment manufacturers
• Pipe-layers: 583T, 587R, 587T, PL72
• Wheel loaders: 920, 930, 986H, 988B, 988F, 988F II, 988G, 994H, 994K
• Earthwork compactor: 836
• Cold planers: PM620, PM622, PM820, PM822, PM825
• Forest machines: 2384C, 2384D, 2484C, 2484D, 559C, 559D, 579C, 579D

Cross-reference numbers

Specifications

The sealing ring is supplied as an individual O-ring. The listed material, hardness, cross-section, inside diameter and outside diameter are the identification parameters for matching the part to the sealing groove and service assembly. The part number may appear in the equipment documentation with or without the hyphen as 7S8561 or 7S-8561.