4M0661 O-Ring for Caterpillar Equipment

4M0661 is an O-ring intended for use in Caterpillar equipment. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The seal is listed for several Caterpillar tracked bulldozers, wheel bulldozers, wheel-type loaders, wheeled tractor-scrapers, pipe-layers, and ground compactors for earthwork. The part identification used in the equipment application data is 4M-0661.

Fitment

The 4M0661 O-ring is used on the following Caterpillar equipment models and machine series:

• Tracked bulldozers: D7RII, D8H, D8T, D9E, D9T.
• Wheel bulldozers: 824, 824B.
• Wheel-type loaders: 988.
• Wheeled tractor-scrapers: 621, 623, 627, 631D, 631E, 631G, 633D, 637E, 637G, 651E, 657E, 657G.
• Pipe-layers: 583H.
• Ground compactors for earthwork: 825B, 826B.

Fitment should be checked against the equipment model and the required seal dimensions before installation. The model groups above identify the Caterpillar machines associated with this part number in the provided application data.

Cross-reference numbers

• Caterpillar part number: 4M-0661.
• Product SKU: 4M0661.

4M0661 and 4M-0661 refer to the same O-ring identification in the supplied parts data. The hyphenated number may be used in Caterpillar equipment documentation, while the SKU is written without the hyphen.

Specifications

The dimensions are specified as an inner diameter of 11.97 in, an outer diameter of 12.525 in, and a cross-section diameter of 0.28 in. The metric length, width, and depth values are the package or listed product dimensions provided for this item and are not additional O-ring sizing designations.