7Y1643 Sun Gear for Caterpillar Equipment

7Y1643 is a sun gear used in the final drive and swing component assemblies of Caterpillar equipment. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is identified as a sun gear and is listed for use with Caterpillar excavator models 320 L, 320B, 320B L, 320N, and 321B. The available application data identifies these models as the compatible equipment for SKU 7Y1643.

Fitment

• Caterpillar 320 L excavator
• Caterpillar 320B excavator
• Caterpillar 320B L excavator
• Caterpillar 320N excavator
• Caterpillar 321B excavator

The listed models are excavators manufactured by Caterpillar. The 7Y1643 sun gear is associated with the final drive and swing components category and is intended for the corresponding drive or swing assembly application. Model designation and machine configuration should be checked against the equipment identification data before installation, as the provided fitment information is limited to the models listed above.

Fitment is stated by model series rather than by a general Caterpillar equipment range. The available data does not specify production years, serial-number prefixes, machine arrangement numbers, or separate left- and right-side applications. These details are therefore not added to the compatibility list.

Specifications

The stated dimensions are length 11.3 cm, width 4.2 cm, and depth 11.3 cm. The listed weight is 2.8 lb. No material specification, tooth count, bore size, shaft interface, thread data, installation hardware, or additional components included with the part are specified in the available product data.

The available information does not provide additional cross-reference numbers from Caterpillar or other suppliers. The part is identified in the supplied data by SKU and part number 7Y1643.