Spare Parts For Hydraulic Cylinders

Browse hydraulic cylinder parts and replacement cylinder components for construction machinery. Products in this category support selected boom, arm, bucket and machine-specific hydraulic cylinder applications.

Use the machine model, cylinder function, OEM reference and dimensional information to confirm compatibility before ordering.

BUCKET CYLINDER DOOSAN DEVELON DX225 DX300 7M ARM 400310-00332A K1011434 LONG 65

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Hydraulic Cylinder Parts for Construction Machinery

Hydraulic cylinders convert fluid pressure into linear force and are used throughout excavators, loaders, cranes and other heavy equipment. Boom, arm and bucket circuits can experience extremely high working loads, making correct cylinder geometry and component condition essential.

HPM Hydraulic supplies selected hydraulic cylinder parts and replacement cylinder components for construction-machine applications.

Identify the Cylinder by Function

One machine can contain several visually similar cylinders with completely different dimensions and load requirements.

Always identify whether the component belongs to the:

boom cylinder,
arm or stick cylinder,
bucket cylinder,
blade cylinder,
stabilizer or outrigger circuit,
other machine function.

Important Cylinder Dimensions

If an OEM reference is unavailable, dimensional data can support identification. Useful measurements include:

closed and extended length,
rod diameter,
cylinder bore,
pin diameter,
mounting-eye width,
hydraulic port position.

Rod and Bore Condition

A cylinder that leaks after repeated seal replacement may have a damaged rod, worn bore or excessive mechanical play.

Inspect chrome surfaces for:

pitting,
scratches,
corrosion,
bending,
impact damage.

Machine-Specific Cylinder Identification

Machine make and model are important, but an OEM cylinder reference provides more certainty when different versions were fitted during production.

HPM currently lists selected machine-specific cylinder products, including a bucket cylinder application for Doosan/Develon DX-series excavators. :contentReference[oaicite:6]{index=6}

FAQ – Hydraulic Cylinder Parts

How do I identify an excavator hydraulic cylinder?

Start with machine model, cylinder function and OEM number. Dimensional measurements can help confirm the application.

What causes repeated hydraulic cylinder seal failure?

Possible causes include damaged rod surfaces, worn guides, excessive side load, contamination and pressure problems.

Are boom and bucket cylinders interchangeable?

No. They normally have different dimensions, stroke lengths, mounting points and load requirements.

What dimensions are useful when identifying a cylinder?

Rod diameter, bore, pin sizes, mounting width, stroke and overall length are among the most useful measurements.