1858979 Piston for Caterpillar Excavators

Part 1858979 is a piston for the hydraulic barrel and piston system of Caterpillar excavators. It is used on the Caterpillar 311B, 312B, 315B, 315B FM L, and 318B excavator models. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The equipment brand specified for this part is Caterpillar. Caterpillar identifies the excavator equipment on which the piston is used; the part itself is manufactured by CTP. The available product information identifies the component as a piston and does not provide a separate hydraulic cylinder position, cylinder assembly designation, or additional assembly contents.

Fitment

• Caterpillar 311B excavator
• Caterpillar 312B excavator
• Caterpillar 315B excavator
• Caterpillar 315B FM L excavator
• Caterpillar 318B excavator

Fitment is limited to the Caterpillar excavator models listed above based on the available product data. The information does not specify the machine serial-number ranges, production years, or individual hydraulic cylinder assemblies. These details should be checked against the machine identification information before installation when more than one piston configuration is used for a model series.

Specifications

The listed dimensions are length, width, and depth measurements of 10.1 cm each. No separate bore diameter, outside diameter, rod diameter, sealing arrangement, material specification, thread specification, surface treatment, or installation hardware is provided in the available data. The supplied weight is 3.2 lb.

The part is described as an individual piston. The available information does not state that seals, rings, bushings, retaining elements, hydraulic barrels, or other components are included. The package contents should therefore be identified as the piston only unless the accompanying parts documentation specifies otherwise.

Part number 1858979 is the product SKU and the identification number supplied for this piston. No additional equipment-manufacturer or supplier cross-reference numbers are provided in the available product information.