How Much Hydraulic Oil Does an Excavator Hold?

A practical guide to excavator hydraulic oil capacity, typical oil volumes and what operators need to know.

Excavators rely on large volumes of hydraulic oil to power booms, arms, buckets and attachments.
Understanding how much hydraulic oil an excavator holds is important for maintenance, system refills and emergency situations.

Hydraulic oil capacity varies depending on the size and model of the machine, but all excavators require sufficient oil levels to maintain system pressure and performance.

If you are unsure which oil your machine requires, see our guide on
what hydraulic oil excavators use.

Typical Excavator Hydraulic Oil Capacity

Hydraulic oil capacity depends on machine size, hydraulic system design and manufacturer specifications. Below are typical ranges for common excavator sizes:

Exact oil capacity should always be confirmed using the manufacturer’s specifications.

Why Hydraulic Oil Capacity Varies

Excavator hydraulic systems differ depending on machine size and application.

Oil capacity is influenced by:

• Hydraulic tank size
• Length of hoses and pipework
• Number of hydraulic cylinders
• Attachments and auxiliary circuits
• System pressure and design

Larger machines with more complex hydraulic systems require significantly higher oil volumes to operate efficiently.

Top-Up vs Full Hydraulic Oil Refill

In real working conditions, operators may need either a small top-up or a full system refill.

• Top-Up – Required after minor leaks or routine maintenance
• Partial Refill – After hose replacement or component repair
• Full Refill – Required after major system failure or contamination

Hydraulic oil is often required urgently following hose failure or system leaks, especially on busy construction sites.

Hydraulic Oil Supply for Excavators

Whether you need a small top-up or a full system refill, access to the correct oil quickly is essential.

We supply hydraulic oil in multiple grades including ISO 32, ISO 46 and ISO 68 for plant machinery and excavators.

See our emergency hydraulic oil supply page for depot collection, take-away supply and bulk delivery options.

Not Sure Which Hydraulic Oil You Need?

Some machines require specialist or OEM-specific hydraulic oil. Using the wrong oil can cause serious damage.

Check Your Oil Now

Maintaining Correct Hydraulic Oil Levels

Maintaining the correct oil level is critical for system performance and component protection.

Best practices include:

• Regular level checks
• Monitoring for leaks
• Using correct oil grade
• Replacing contaminated oil

For more detail on oil selection and maintenance, see our hydraulic oil guide.

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Excavator Hydraulic Oil Capacity – FAQ

How much hydraulic oil does a typical excavator hold?

Hydraulic oil capacity ranges from around 20 litres for mini excavators up to 300+ litres for large machines.

Does excavator size affect oil capacity?

Yes. Larger excavators require significantly more hydraulic oil due to bigger systems and additional components.

When is a full oil refill required?

A full refill is usually required after major repairs, contamination or complete system drainage.

Can I top up hydraulic oil myself?

Yes, but always use the correct oil grade and follow manufacturer guidelines.