Product Overview

The 707-99-58090 hydraulic cylinder seal kit is a factory-manufactured aftermarket replacement kit cross-referenced against the Komatsu part number 707-99-58090. The Hercules Sealing Products catalog lists it as KOM-707-99-58090 (kit code SK-P-UB-14-100.00×140.00) for Komatsu machines, with the application field reading BUCKET and the model field reading PC300LC-7E0 (serial number range 50001–55786). Independent listings title the same number as the bucket cylinder seal kit for the Komatsu PC300-7 and PC300LC-7 excavators (Mottrol USA; eBay listing 230784686664; 777parts service-kit row).

The kit reseals the bucket cylinder of the verified Komatsu PC300-7 / PC300LC-7 machines. DJF Seals manufactures and supplies the 707-99-58090 kit at factory-direct wholesale pricing for Komatsu equipment dealers, repair shops and fleet maintenance programs.

Verified Application

The following application data was cross-checked against the Hercules Sealing Products catalog and independent listings:

Note: independent sources state different rod and bore figures for this kit (the Hercules kit code implies a 100.00 x 140.00 size reference, and an eBay listing table states rod 90 mm x bore 140 mm), while the current page states another figure. Because they disagree, no dimension is asserted here. Materials, pressure rating, temperature range, exact piece counts, certifications and service life are factory data and are not independently verified.

Replacement Scope

This kit covers the sealing elements required to reseal the bucket cylinder of the verified Komatsu PC300-7 and PC300LC-7 excavators. The verified reference is 707-99-58090 cross-referenced to the bucket cylinder position; the exact kit contents and piece counts should be verified with the factory against your cylinder before shipment.

Fitment Verification

The part number, bucket position and fitments were verified through multiple independent sources:

• Hercules Sealing Products (herculesus.com): “KOM-707-99-58090, SK-P-UB-14-100.00×140.00, KOMATSU, for models PC300LC-7E0, BUCKET, Hydraulic Seal Kit; Code P-UB-14; Serial Num 50001-55786” — establishing the part number, the bucket application and a model/serial row.
• Mottrol USA (mottrolusa.com): “707-99-58090 Bucket Cylinder Seal Kit Fits Komatsu Pc300-7 Pc300Lc-7 Pc340Lc-7K” — corroborating the bucket position and adding the PC340LC-7K to the source set.
• eBay listing 230784686664: bucket cylinder table for the PC300-7 shows cylinder 707-01-0A460 with rod 90 mm and bore 140 mm — corroborating the bucket position and providing a second dimension set.
• gethydraulics.com: lists KOM-707-99-58090 for Komatsu bucket cylinder applications (noting 3.2 m and 4 m arm configurations) — corroborating the bucket application family.
• 777parts catalog: service kit row for 707-99-58090 — corroborating the number as a service kit for Komatsu machines.
• Additional listings (Alibaba, Amazon.ca) extend the number to the PC300-8, PC300HD-8, PC300LC-8, PC350-7/8, PC350LC-8 and PC360-7 excavators — a wider machine set than the current page states.
• Conflict note: rod/bore figures disagree across the source set (Hercules kit code vs. the eBay listing table vs. the current page). Because no two independent sources agree, no dimension is asserted in this copy.
• Conflict note: the machine set differs between sources — the current page and Mottrol USA center on the PC300-7 / PC300LC-7, Hercules adds the PC300LC-7E0, and marketplace listings add the PC350 and PC360 families. Both the narrow and the wider sets are documented rather than merged.
• Materials, pressure, temperature, exact piece counts, certifications and service life are not independently verified.

Factory Inspection & Packing

Each 707-99-58090 kit is assembled and checked at the DJF factory before packing. Sealing elements are placed in labeled poly bags marked with the part number, then packed into export cartons for protection during international shipping. Kits can be packed under DJF branding, neutral packaging, or your own private label for distribution.

Wholesale Ordering

DJF Seals supplies the 707-99-58090 kit at factory-direct wholesale pricing for distributors, dealers and repair shops. To request a quotation, send your part number and quantity to [email protected] or [email protected]. OEM/ODM service, custom packaging and bulk container shipping are available for regular programs.

MOQ

MOQ: 5 kits.

FAQ

Q: Which machines does the 707-99-58090 seal kit fit?
A: Verified fitments are the Komatsu PC300-7 and PC300LC-7 excavators, per the current page, the Mottrol USA listing, the eBay listing and 777parts; the Hercules catalog also lists the PC300LC-7E0 (serial 50001–55786), and some marketplace listings extend the number to the PC350 and PC360 families.

Q: Which cylinder does this kit service?
A: The bucket cylinder. The Hercules catalog application field reads “BUCKET” and the listing titles all state “bucket cylinder seal kit”.

Q: What are the cylinder dimensions for this kit?
A: Independent sources state different figures (the Hercules kit code references a 100.00 x 140.00 size, an eBay listing table states rod 90 mm x bore 140 mm, and the current page states another size). Because they disagree, no dimension is asserted. Verify your cylinder measurements with us before shipment.

Q: Is this a Komatsu genuine or OEM-original part?
A: No. It is a factory-manufactured aftermarket replacement kit cross-referenced against the Komatsu part number 707-99-58090.

Q: What is the minimum order quantity?
A: MOQ: 5 kits.