4N4421 Shaft Drive for Caterpillar Air Starter Motors

The 4N4421 Shaft Drive is a spare part used in air starter motor applications on Caterpillar equipment. The listed applications include Caterpillar gas engines, generator set engines, generator sets, industrial engines, marine engines, petroleum engines, petroleum packages, and petroleum transmissions. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

Fitment

The part is listed for the following Caterpillar equipment and engine applications:

• Gas engines: G3304, G343.
• Generator set engines: 3304, 3306, 3306B, 3406B, 3406C, 3408.
• Generator sets: 3306B, 3406C, 3408C, 3456, C18, C9.
• Industrial engines: 3176B, 3176C, 3196, 3304, 3306, 3306B, 3406, 3406B, 3406C, 3406E, 3408, 3408C, 3408E, 3456, C-10, C-12, C-15, C-16, C-9, C11, C13, C15, C18, C7, C9, D342C.
• Marine engines: 3176B, 3176C, 3196, 3304, 3304B, 3306, 3306B, 3406, 3406B, 3406C, 3406E, 3408, 3408C, C-12, C12, C15, C18, C9, D342, D353C.
• Petroleum engines: C15, C18, C9.
• Petroleum packages: CX31-C13I, CX31-C15I, CX31-C18I, CX31-C9I, CX35-C18I, CX35-P800, TH35-C11I, TH35-C13I, TH35-C15I.
• Petroleum transmissions: TH31-E61.

Fitment is specified by the equipment application and model designation listed above. The model groups include both engine models and package or transmission designations, so the complete application description should be checked against the air starter motor assembly being serviced.

Specifications