Hercules Sealing Products Seals, Seal Kits & Replacement Parts

Hercules Sealing Products, founded in 1962 and headquartered in Clearwater, Florida, makes aftermarket hydraulic and pneumatic cylinder repair seals, seal kits, replacement cylinders, and pump, motor, and valve kits for heavy-equipment repair. The company has operated under Diploma PLC since its 1996 acquisition and remains active, supplying construction, mining, dump truck and refuse collection, material handling, agriculture, logging, and industrial repair applications. Northern Hydraulics supplies Hercules aftermarket seals, seal kits, and repair parts, with replacement and equivalent parts available for cross-reference.

Hercules Sealing Products Product Lines & Series

Hercules organizes its catalog around hydraulic seal kits, cylinder repair kits, replacement cylinders, and pump, motor, and valve kits. Confirmed O-ring and seal-kit families include the 568 Series O-Ring Kits, 900 Boss Series Kits, Max Series Kits, Metric O-Ring Kits, and FKM/PTFE O-Ring Kits — most of which fall under the Hercules O-ring kits stocked at Northern Hydraulics in both inch and metric configurations. On the cylinder side, the HAC Series and LHC Series cover common aftermarket repair needs, alongside the Sheffer HH Series. The HLC (Hercules Low-Cost) Series cylinders are drop-in replacements for the earlier HAC (Hercules Aftermarket Compatible) Series, which simplifies spec matching when an original cylinder is no longer available. Repair shops sourcing rebuild components can start with our Hercules O-ring kit cross-reference and request any kit not shown.

Cross-Referencing Hercules Sealing Products Parts

Hercules seals are interchangeable across multiple OEM equipment brands, including Caterpillar, Case, Komatsu, and Bobcat, which makes them a practical source for rebuilding cylinders when an original-equipment seal kit is discontinued or back-ordered. If you have an OEM seal-kit number, cylinder bore and rod dimensions, or a superseded Hercules part such as an HAC-to-HLC changeover, we can match the correct replacement or equivalent kit. Hercules also distributes Bulldog hydraulic and engine sealing products, now a separate brand, which widens the cross-reference range for heavy-equipment repair. Send your part numbers, equipment make and model, or a sample of the worn seal and request a cross-reference quote.