Product Overview

The 707-99-44340 hydraulic cylinder seal kit is a factory-manufactured OEM replacement kit for the arm (stick / crowd) cylinder of the Komatsu PC120-7 and PC130-7 excavators. Independent aftermarket sources agree on the arm-cylinder application: k-part / 777parts lists 707-99-44340 as the Komatsu “SERVICE KIT, ARM CYLINDER” for PC120 / PC130, made-in-china lists it as the PC130-7 Arm Cylinder Seal Kit, YearnParts sells it as the Arm Cylinder Seal Kit for the Komatsu PC100-6 and PC130-7, and eBay listings describe the same number as the PC130 arm crowd stick cylinder seal kit. The current DJF page titles the kit “707-99-44340 Arm Cylinder Seal Kit for Komatsu PC120-7 & PC130-7 Excavators,” wording that matches the arm-cylinder position used across the sources reviewed (see Fitment Verification for the model-row differences).

DJF Seals manufactures and supplies the 707-99-44340 kit at factory-direct wholesale pricing for Komatsu excavator dealers, repair shops, rental fleets and fleet maintenance programs.

Verified Application

The following application data was cross-checked against aftermarket parts listings (k-part / 777parts, made-in-china, eBay, YearnParts, fabheavyparts):

Materials, pressure rating, temperature range, exact piece counts, certifications and service life are factory data and are not independently verified for this part number; such claims on the current page are not repeated here (see Fitment Verification).

Replacement Scope

This kit supplies the sealing elements needed to reseal the arm (stick / crowd) cylinder of the verified Komatsu PC120 / PC130 excavator family. k-part / 777parts anchors the number to the PC120 / PC130 arm cylinder and YearnParts and made-in-china extend it to the PC130-7 and PC100-6. Because the model rows differ between sources, verify the exact machine model and cylinder before ordering; kit contents vary between suppliers, so the exact component set is matched to your cylinder before shipment.

Fitment Verification

The part number, application and fitments above were cross-checked against the following sources:

• k-part / 777parts: lists “707-99-44340 KOMATSU … SERVICE KIT, ARM CYLINDER” with PC120 and PC130 in its compatibility rows (PC128UU also appears in the linked row).
• made-in-china: lists 707-99-44340 as the PC130-7 Arm Cylinder Seal Kit in its Komatsu PC130-7 cylinder-seal-kit table.
• eBay: describes the same number as the Komatsu PC130 7K Arm Crowd Stick Cylinder Seal Kit (Part No. 707-99-44340).
• YearnParts: sells it as the Arm Cylinder Seal Kit 707-99-44340 for the Komatsu PC100-6 and PC130-7 excavator.
• fabheavyparts: carries the Arm Cylinder Seal Kit 707-99-44340 in its PC100-6 replacement-parts listing.
• Current DJF page (707-99-44340-arm-cylinder-seal-kit-for-komatsu-pc120-7-pc130-7-excavators): titles the kit for the Komatsu PC120-7 and PC130-7 arm cylinder.
• Conflict note: model rows — the current page names PC120-7 and PC130-7, while the catalogs also list PC100-6, PC128UU and a plain PC130 (7K) row for the same number. The exact model generation differs between sources; verify the machine model and cylinder before ordering.
• Bore / rod: no rod or bore figure is recorded by at least two independent sources for this number, so no dimension is asserted above.
• Materials, pressure, temperature, exact piece counts, certifications and service life are not independently verified.

Factory Inspection & Packing

Each 707-99-44340 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 707-99-44340 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 707-99-44340 seal kit fit?
A: k-part / 777parts anchors the number to the Komatsu PC120 and PC130 arm cylinder, while made-in-china, eBay and YearnParts extend it to the PC130-7 and PC100-6. The model rows differ between sources; verify the machine model and cylinder before ordering.

Q: Which cylinder does it seal?
A: The arm (stick / crowd) cylinder. k-part / 777parts lists it as the Komatsu “SERVICE KIT, ARM CYLINDER,” and made-in-china, eBay and YearnParts use the same arm-cylinder wording.

Q: What are the rod and bore of this kit?
A: No rod or bore figure is recorded by at least two independent sources for 707-99-44340, so no dimension is asserted here. Measure your cylinder or request the confirmed component list before ordering.

Q: Is this the boom or the bucket kit?
A: The independent sources reviewed describe 707-99-44340 as the arm cylinder kit. The PC130-7 family uses separate boom (707-99-37300) and bucket (707-99-25870) numbers per the same tables; check your cylinder position before ordering.

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