1K7991 Cup for Caterpillar Equipment

The 1K7991 cup is a ball-bearing component used in Caterpillar equipment. It is listed for Caterpillar paving compactors, engine-machine applications, integrated toolcarriers, and marine engines. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is identified by SKU 1K7991 and is supplied as a cup component. The available product data lists the Caterpillar equipment applications and machine or engine models below; fitment should be confirmed against the equipment serial number and the bearing arrangement before installation.

Fitment

The 1K7991 cup is listed for the following Caterpillar equipment categories:

• Caterpillar paving compactor
• Caterpillar engine-machine application
• Caterpillar integrated toolcarrier
• Caterpillar marine engine

Compatible Caterpillar models and engine series listed for this part are:

• Caterpillar CD-54
• Caterpillar 3054C
• Caterpillar 3056E
• Caterpillar 3116
• Caterpillar 3126
• Caterpillar 3204
• Caterpillar C6.6
• Caterpillar IT28F
• Caterpillar IT28G
• Caterpillar 3304

The listed fitment includes both complete machine models and engine series. The part application therefore covers the corresponding Caterpillar assemblies in which the 1K7991 bearing cup is specified. Model designation alone may not identify every applicable configuration, so the equipment serial number and the removed component number remain relevant for parts verification.

Cross-reference numbers

1K7991 is the part number used for identification in the available Caterpillar and CTP interchange information. No additional supplier numbers or separate reference numbers are provided in the product data.

Specifications

The dimensions and weight above are the listed product measurements. The supplied data does not specify the bearing position, bearing assembly number, material grade, internal clearance, or thread details. The product data also does not indicate that additional bearing components are included with the 1K7991 cup.

For identification, compare the marking or removed part number with 1K7991 and check the dimensions against the installed bearing assembly. The application list covers CD-54, 3054C, 3056E, 3116, 3126, 3204, C6.6, IT28F, IT28G, and 3304 Caterpillar equipment or engine series.