4206018 Boom Cylinder Seal Kit 125mm Bore 85mm Rod for Hitachi EX200 EX200LC Excavator

4206018 Boom Cylinder Seal Kit

4206018 is a boom hydraulic cylinder seal kit used on selected Hitachi EX200 and EX200LC excavators. The kit is specified for boom cylinders with a 125 mm bore and 85 mm rod diameter and is used on both left-hand and right-hand boom cylinder configurations.

This seal kit is intended for rebuilding the hydraulic sealing surfaces inside the boom cylinder. Correct identification should be based on the 4206018 part number, cylinder dimensions and original cylinder configuration rather than the excavator model alone.

EX200 Boom Cylinder Fitment

4206018 is listed for Hitachi EX200 and EX200LC boom cylinders. Catalog applications include left-hand boom cylinder groups 4180277 and 4223826, together with right-hand cylinder groups 4180276 and 4223825.

All of these configurations use the same 4206018 seal kit with a 125 mm cylinder bore and 85 mm rod size. When the original cylinder number is available, it provides an additional way to confirm the correct repair kit before ordering.

Cylinder Inspection Before Rebuilding

Before installing a new seal kit, inspect the piston rod for scoring, corrosion and chrome damage. The cylinder bore, piston, gland and seal grooves should also be checked for wear or surface damage that could cause a new seal set to fail prematurely.

Clean all cylinder components carefully before assembly and verify the installation direction of each seal, backup ring and wiper. If the rod or cylinder surface is damaged beyond acceptable limits, replacing only the seals may not correct the leakage problem.

Topvelsun Seal Kit Supply

Topvelsun supplies hydraulic cylinder seal kits and excavator repair parts with 1-piece MOQ and a 6-month warranty. Send the part number, excavator model, cylinder number or cylinder dimensions for fitment confirmation before ordering.