Furukawa FX45 Breaker Seal Kit 902308-920010 | FRD Hammer Repair Kit

902308-920010 Hydraulic Breaker Seal Kit — Furukawa FRD FX45 Excavator Hammer

The FX45 sits in Furukawa’s Fx45a/55a small series, a step up from the FX35 in both size and output. Typical assembled weight runs around 606 lbs (275 kg), with a hydraulic flow range of roughly 7.9–15.8 GPM and maximum torque around 550 ft-lbs. It’s commonly paired with mini excavators in the Kubota U35/KX040 class, skid steer loaders, and rubber-tired backhoes, and is typically specified for site preparation, foundation removal, road repair, and driveway/sidewalk demolition — jobs that need more sustained breaking power than the FX35 can deliver.

A distinguishing feature of the FX45a/55a line is its long front head bushing, which keeps the working steel in proper alignment for longer service life, paired with an oval retaining pin designed for increased steel contact and extended pin life. Like the rest of Furukawa’s small series, the FX45 uses a mono-block design with no thru-bolts — but the higher torque and flow range compared to the FX25/FX35 mean the internal seals see proportionally higher pressure cycling, making seal material quality more critical at this size.

Key Features & Benefits

Demolition-Grade Material Durability

Formulated with premium-grade Polyurethane (PU) and heavy-duty Nitrile Rubber (NBR) compounds built to handle the FX45’s higher flow rate and torque output without premature breakdown.

Precision Zero-Leakage Fitment

Engineered to the FX45’s specific internal profile to eliminate internal oil bypass and cylinder drift, maintaining consistent breaking force across the higher output range this model is chosen for.

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 the sustained duty cycles typical of FX45 applications like foundation removal and road repair work.

Technical Specifications

• Brand Compatibility: Furukawa / FRD / Kent
• Compatible Hammer Model: Furukawa FX45 / FX45a
• Class Reference: Small series (Fx45a/55a group), ~606 lbs assembled class
• Hydraulic Flow Range: Approx. 7.9–15.8 GPM
• Maximum Torque: Approx. 550 ft-lbs
• Typical Carriers: Mini excavators (e.g. Kubota U35/KX040 class), skid steer loaders, rubber-tired backhoes
• OEM Reference Part Number: 902308-920010 (902308920010)
• Product Type: Hydraulic Breaker Seal Kit / Hammer Service Repair Kit
• Primary Material: High-Performance Polyurethane (PU) & High-Temp NBR Rubber

Important Fitment & Ordering Note

FX45 and FX45a units may vary in seal profile depending on mounting configuration (FSP, SS, or standard) and production year. Please verify your breaker’s model plate, mounting type, and serial number against OEM specifications before ordering, or contact our team with these details for confirmation.