Furukawa FX55 Breaker Seal Kit 902309-920010 | FRD Hammer Repair Kit

902309-920010 Hydraulic Breaker Seal Kit — Furukawa FRD FX55 Excavator Hammer

The FX55 is the largest model in Furukawa’s Fx45a/55a small series, sized for 4.0–7.0 ton base machines — noticeably heavier-class carriers than the FX45. Operating weight runs around 245 kg in the standard P&B/FT configuration (280–292 kg for S/XS versions), with an operating pressure range of 12–16 MPa, oil flow of 40–85 L/min, and an impact rate of 500–1,100 blows per minute. The rod diameter measures 68mm, delivering the penetration force needed for demolition, quarrying, ground excavation, and trenching work.

Furukawa also offers sound-dampened S and XS versions of the FX55 (down to 116 dB(A) sound power level) for noise-sensitive urban demolition sites, alongside the standard FT configuration — worth checking against your unit’s data plate, since seal wear patterns and service intervals can differ slightly between the standard and dampened housings. Like the FX45, the FX55 uses a long front head bushing and oval retaining pin to extend working steel alignment and pin life, on top of the mono-block, no-thru-bolt body shared across Furukawa’s small breaker series.

Key Features & Benefits

Demolition-Grade Material Durability

Formulated with premium-grade Polyurethane (PU) and heavy-duty Nitrile Rubber (NBR) compounds built to handle the FX55’s higher operating pressure (up to 16 MPa) and oil flow range without premature breakdown.

Precision Zero-Leakage Fitment

Engineered to the FX55’s specific 68mm rod profile to eliminate internal oil bypass and cylinder drift, maintaining consistent breaking force at this larger displacement class.

Complete Hammer Rebuild Package

Includes a fully matched set of step seals, buffer seals, dust wipers, quad rings, and O-rings for a complete cylinder overhaul in one kit.

Extended Service Life & Reduced Downtime

Thermal stability and wear resistance suited to sustained duty cycles at the FX55’s higher impact energy output (up to roughly 6,230 joules per blow), reducing the frequency of unplanned rebuilds.

Technical Specifications

• Brand Compatibility: Furukawa / FRD / Kent
• Compatible Hammer Model: Furukawa FX55 / FX55-2S / FX55 SS
• Class Reference: Small series (Fx45a/55a group), largest model in the series
• Operating Weight: Approx. 245 kg (P&B/FT), 280-292 kg (S/XS)
• Operating Pressure: 12–16 MPa
• Oil Flow Range: 40–85 L/min
• Impact Rate: 500–1,100 bpm
• Rod Diameter: 68mm
• Recommended Base Machine: 4.0–7.0 ton excavators
• OEM Reference Part Number: 902309-920010 (902309920010)
• Product Type: Hydraulic Breaker Seal Kit / Hammer Service Repair Kit
• Primary Material: High-Performance Polyurethane (PU) & High-Temp NBR Rubber

Important Fitment & Ordering Note

The FX55 is available in standard (FT), sound-dampened (S), and extra-quiet (XS) housing configurations, each with a different operating weight. Please verify your unit’s exact configuration, model plate, and serial number against OEM specifications before ordering, or contact our team with these details for confirmation.