Transmission Seal Ring 1T0309 for Caterpillar Equipment

1T0309 is a transmission seal ring used in Caterpillar equipment. The part is listed under the Caterpillar equipment fitment for tracked bulldozers, an off-road dump truck, and pipe-layer machines. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The ring is identified as a lock-type seal made from cast iron. The listed dimensions include a cross-section thickness of 0.124 inch, a cross-section width of 0.138 inch, and a base diameter of 5.750 inches.

Fitment

The following Caterpillar equipment models are listed for part number 1T0309:

• Tracked bulldozers: 183B
• Tracked bulldozers: 8D
• Tracked bulldozers: 8S
• Tracked bulldozers: D8H
• Tracked bulldozers: D8K
• Tracked bulldozers: D9G
• Tracked bulldozers: D9H
• Off-road dump truck: 777

The source data also associates this part number with a Caterpillar pipe-layer application identified as 594583K594H. Because the source presents this designation without separators, it is retained as provided rather than divided into separate model numbers.

Fitment should be checked against the machine model, serial number, and the part number installed in the transmission assembly before ordering or installation.

Cross-reference numbers

• 1T0309
• 1T-0309

Both designations refer to the same listed ring number, with and without a hyphen. The numbers are included as identification and cross-reference formats for the part.

Specifications

The dimensional data is provided in both inches and centimetres as listed in the product information. The inch values describe the ring geometry, while the length, width, depth, and weight values are the listed product details. The part is supplied as a ring; no additional components or kit contents are specified in the available data.