707-99-58030 Service Kit for Komatsu Hydraulic Excavators

The 707-99-58030 Service Kit is a hydraulic cylinder seals kit for Komatsu hydraulic excavators. It is used with the Komatsu PC300 and PC350 machine series, including standard, LC, and the specified generation variants listed below.

This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts). The part is supplied as a service kit for maintaining the hydraulic cylinder assembly on compatible Komatsu equipment.

The supplied product data identifies the kit by SKU 707-99-58030. The available information does not provide an itemized list of the individual sealing elements included in the kit, their material grades, or the hydraulic cylinder position for which each element is intended. Therefore, the kit should be matched by the complete part number and the equipment model before installation.

Fitment

The service kit is specified for the following Komatsu hydraulic excavator models and model variants:

• Komatsu PC300-7
• Komatsu PC300-8
• Komatsu PC300LC-7
• Komatsu PC300LC-8
• Komatsu PC350-7
• Komatsu PC350-8
• Komatsu PC350LC-7

The listed applications cover the PC300 and PC350 excavator series identified in the product data. The available description does not specify a separate fitment distinction by boom, arm, bucket, travel, swing, or other hydraulic cylinder location. Confirming the machine series and the complete service-kit number is required when several cylinder assemblies are installed on the same excavator.

Model suffixes are part of the fitment information. PC300-7, PC300-8, PC300LC-7, and PC300LC-8 are listed separately from the PC350-7, PC350-8, and PC350LC-7 variants; they should not be treated as interchangeable solely because they belong to the same general excavator family.

Cross-reference numbers

• 707-99-58030 — service kit part number and aftermarket interchange number specified in the available product data.

No additional equipment-manufacturer or supplier part numbers are provided in the source data. The number 707-99-58030 should be used as the primary reference when checking the service kit against Komatsu equipment records, parts catalogs, or the identification marking on the removed kit.

Specifications

The package dimensions stated above are 15 cm in length, 15 cm in width, and 2.3 cm in depth. The stated weight is 1.4 lb. No separate dimensions for individual seals, gland components, piston components, rod components, or other kit elements are available in the product information.

Before fitting, compare the complete number 707-99-58030, the excavator model designation, and the application of the hydraulic cylinder. The supplied data does not identify thread specifications, seal materials, operating-pressure ratings, temperature range, cylinder position, or the quantity of each component in the kit.