1pc new sealed kit. Factory Komatsu parts. Not aftermarket.

Komatsu 707-99-77140 Arm Cylinder Seal Kit, Hydraulic

The Komatsu 707-99-77140 is a hydraulic seal kit for the arm (stick) cylinder on Komatsu PC600 and PC650 series excavators and on some PC300LL, PC350LL and PC390LL log loaders. It is sized for a cylinder with a 200 mm bore and a 140 mm rod, and it is used to reseal the cylinder during a rebuild.

Applications / Compatible Equipment

Komatsu Excavators (Arm Cylinder)

PC600-6, PC600-6A, PC600-6K, PC600-6KJ, PC600-6A-KJ (S/N 10001 and up; -6K S/N K30001 and up)

PC600LC-6, PC600LC-6A, PC600LC-6K, PC600LC-6KJ, PC600LC-6A-KJ (S/N 10001 and up; -6K S/N K30001 and up)

PC600-7, PC600-7-M1 (S/N 20001 and up); PC600-7K (S/N K40001 and up)

PC600LC-7, PC600LC-7-M1 (S/N 20001 and up); PC600LC-7K (S/N K40001 and up)

PC650-6, PC650-6A, PC650LC-6, PC650LC-6A (S/N 30001 and up)

PC650-7-M1, PC650LC-7-M1 (S/N 40001 and up)

Komatsu Log Loaders (Arm Cylinder)

PC300LL-7E0 (S/N A86001 and up)

PC350LL-7E0 (S/N A50001 and up)

PC390LL-10 (S/N A50601 and up)

Cross-References (partial list)

Komatsu: 707-99-77140 (also written 7079977140)

Hercules: KOM-707-99-77140

Specifications

Type: Hydraulic cylinder seal kit, arm cylinder

Bore: 200 mm

Rod: 140 mm

Wiper: Press-in type

Rod Seal: U-seal with buffer seal

Piston Seal: Four-piece capped T-seal

Important: Always verify fitment against your OEM part number, equipment model, and serial number before ordering. Applications are based on manufacturer catalogs and cross-reference data and may not cover every serial range or configuration.

Model	Komatsu 707-99-77140
Brand	Komatsu
Part Type	Seal Kit

Komatsu Cylinder Seal Kit 707-99-77140 New Factory Kit

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