Preventing hydraulic leaks and maintaining peak system pressure are essential for minimizing downtime on job sites. Whether you are operating utility-sized machines like the EX100 or heavy-duty excavators like the EX200 series, replacing worn seals with high-grade aftermarket kits restores digging force, smooths operation, and stops costly fluid loss.
Below is a detailed application and part number guide for Hitachi Hydraulic Excavator Seal Kits covering Boom, Arm, Bucket, Clamshell, and specialized cylinder applications.
Hitachi Excavator Seal Kit Application Chart
1. Hitachi EX100 & EX120 Series
Product Name
Equipment Type
Model Compatibility
Part Numbers (P/N)
Boom Cylinder Seal Kit
Hydraulic Excavator
EX100
4206340
Arm Cylinder Seal Kit
Hydraulic Excavator
EX100
4206343
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX100
4206345
Boom Cylinder Seal Kit
Hydraulic Excavator
EX1000
04163899
Boom (w/ Piston Bearing)
Hydraulic Excavator
EX1000
04171990
Boom Cylinder Seal Kit
Hydraulic Excavator
EX120
4206343
Arm Cylinder Seal Kit
Hydraulic Excavator
EX120
4206344
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX120
4206345
Boom Cylinder Seal Kit
Hydraulic Excavator
EX120-1
14286459
Arm Cylinder Seal Kit
Hydraulic Excavator
EX120-1
14286463
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX120-1
14286739
Boom Cylinder Seal Kit
Hydraulic Excavator
EX120-2
4286459
Arm Cylinder Seal Kit
Hydraulic Excavator
EX120-2
4286463
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX120-2
4286739
2. Hitachi EX150, EX160 & EX1800 Series
Product Name
Equipment Type
Model Compatibility
Part Numbers (P/N)
Arm Cylinder Seal Kit
Hydraulic Excavator
EX150
4216264P
Boom Cylinder Seal Kit
Hydraulic Excavator
EX150
4369893P
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX150
4369893P
Boom Cylinder Seal Kit
Hydraulic Excavator
EX150LC-5 / EX160LC-5
4389719 / 0309304 / 0298907 / 0667008
Arm Cylinder Seal Kit
Hydraulic Excavator
EX150LC-5 / EX160LC-5
4389720 / 4272960 / 0686405 / 0310908
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX150LC-5 / EX160LC-5
4389721 / 0310504 / 0666808 / 0310510
Dump Cylinder Seal Kit
Hydraulic Excavator
EX1800
04221872
3. Hitachi EX200 Series (EX200, EX200-1, EX200-2, EX200-3)
Product Name
Equipment Type
Model Compatibility
Part Numbers (P/N)
Boom Cylinder Seal Kit
Hydraulic Excavator
EX200 / EX200LC
4206018
Arm Cylinder Seal Kit
Hydraulic Excavator
EX200 / EX200LC
4206019
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX200 / EX200LC
4206020
Clamshell Seal Kit
Hydraulic Excavator
EX200 / EX200LC
4214722
Boom Cylinder Seal Kit
Hydraulic Excavator
EX200-1
14286774
Arm Cylinder Seal Kit
Hydraulic Excavator
EX200-1
14286780
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX200-1
14286784
Boom Cylinder Seal Kit
Hydraulic Excavator
EX200-2 / EX200LC-2
4286774 / 4272960 / 0309309 / 0261308
Arm Cylinder Seal Kit
Hydraulic Excavator
EX200-2 / EX200LC-2
4286780 / 0309204 / 0409912 / 0254309
Bucket Cylinder Seal Kit (Option 1)
Hydraulic Excavator
EX200-2 / EX200LC-2
4286784 / 0310504 / 0298907 / 0410005
Bucket Cylinder Seal Kit (Option 2)
Hydraulic Excavator
EX200-2 / EX200LC-2
0310604 / 0310610 / 0310609 / 4286739
Clamshell Seal Kit
Hydraulic Excavator
EX200-2 / EX200LC-2
4369902 / 4272960 / 0309009 / 0223713
Rolling Cylinder Seal Kit
Hydraulic Excavator
EX200-2 / EX200LC-2
4320954 / 0309204 / 0237220 / 0387305
Boom Cylinder Seal Kit
Hydraulic Excavator
EX200-3 / EX200LC-3 / EX200H-3 / EX200LCH-3
4369901 / 4272960 / 0261308 / 0309309
Arm Cylinder Seal Kit
Hydraulic Excavator
EX200-3 / EX200LC-3 / EX200H-3 / EX200LCH-3
0309204 / 0254309 / 0409912
Bucket Cylinder Seal Kit
Hydraulic Excavator
EX200-3 / EX200LC-3 / EX200H-3 / EX200LCH-3
0310504 / 0298907 / 0410005
Why Upgrade Your Hydraulic Cylinder Seals?
Engineered for High-Pressure Resistance: Built using polyurethane (PU), nitrile rubber (NBR), and PTFE materials to handle intense pressure spikes and heavy digging loads.
Temperature & Wear Protection: Maintains structural elasticity under severe heat friction and abrasive working environments (dust, mud, and debris).
Complete Overhaul Coverage: Rebuilding with a full seal kit—including rod seals, piston seals, wiper seals, and buffer rings—ensures uniform wear and prevents frequent tear-downs.
Pre-Ordering Verification Tips
Verify Machine Serial Numbers: Machine generations (e.g., Dash 1 vs. Dash 2 vs. Dash 3) often use different cylinder shaft and bore dimensions.
Check Cylinder Stamped Part Numbers: Locate the OEM numbers stamped directly onto the cylinder barrel or head gland to confirm cross-compatibility.
Measure Rod and Bore Dimensions: If your equipment has undergone aftermarket cylinder replacement, measure the outer rod diameter and inner cylinder bore before ordering.
