9T4179 Large Servo Piston

9T4179 is a large servo piston used in brake caliper applications on Caterpillar equipment. The part is listed for Caterpillar excavators, pipelayers, and track-type tractors, including the models specified below.

This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts). The equipment brand associated with the listed applications is Caterpillar; Caterpillar is identified here as the manufacturer of the machines on which the part is used.

The product is identified by SKU 9T4179 and by the description “Large Servo Piston.” Its catalog category is Brake Calipers. The available equipment data identifies the part by machine model and series rather than by a broader machine-family description, so the fitment list below follows the recorded applications.

Fitment

• Caterpillar Excavator: 330C L.
• Caterpillar Pipelayer: 572R.
• Caterpillar Track-Type Tractor: D7H.
• Caterpillar Track-Type Tractor: D7R.
• Caterpillar Track-Type Tractor: D8N.

For the excavator application, the listed model is Caterpillar 330C L. For the pipelayer application, the listed model is Caterpillar 572R. The track-type tractor applications recorded for 9T4179 are Caterpillar D7H, D7R, and D8N.

Fitment is stated for the specific models shown above. The available product data does not provide additional machine configurations, production ranges, serial-number intervals, or component-assembly positions. These details are therefore not included as part of the application information.

The part name indicates a large servo piston, while the catalog category places it under brake calipers. No additional information is provided about the complete brake caliper assembly, accompanying hardware, seals, or other parts supplied with the piston.

Specifications

The recorded dimensions are 5 cm in length, 5 cm in width, and 24 cm in depth. The recorded weight is 0.95 lb. These values are the available catalog measurements for the individual 9T4179 part and should not be interpreted as measurements of a complete brake caliper assembly or of a packaged shipment.

No material specification, thread information, seal specification, mounting detail, operating pressure, or included-component list is provided in the available product data. Such parameters are not added to avoid assigning unverified characteristics to the part.