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Hydraulic Reservoir Tanks

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Hydraulic reservoir tanks hold, cool, and de-aerate the fluid in a power unit, available in steel and aluminum across multiple capacities with side- and top-mount port options. Pick the tank body or the parts that finish and service it:

Reservoirs – steel and aluminum tank bodies sized to your pump and cooling load
Reservoir Accessories – breather caps, gauges, strainers, filler assemblies, and return fittings

Shop by Hydraulic Reservoir Tanks Category:

Reservoir Accessories

How to Choose a Hydraulic Reservoir Tank

A reservoir is sized around your pump flow and the heat your circuit generates, not just the volume of oil it holds. Confirm these points before you order:

Capacity: A common starting rule is a tank volume of roughly 2 to 3 times pump GPM, then adjust up for high duty cycles or limited cooling. Verify against your unit's requirements.
Material: Steel tanks are typical on stationary and industrial power units; aluminum tanks cut weight on mobile and vehicle-mounted applications. Both are widely stocked.
Size and footprint: Match length, width, and height to the available mounting space, and check port locations (suction, return, drain) against your plumbing.
Mounting and ports: Side-mount versus top-mount pump arrangements, port count, and thread type (NPT or SAE) all affect fit.
Application: Log splitters, dump trailers, truck-mounted pumps, and shop power units each have different return-flow and heat profiles. Confirm rated capacity against your typical operating load.

Which Reservoir Tank Is Right for the Job?

Start with Reservoirs when you need the tank body itself, sized in steel or aluminum to your pump and cooling load. Move to Reservoir Accessories for the components that finish a build or service an existing unit: breather caps, filler-breather assemblies, sight and temperature gauges, suction strainers, and return-line fittings. Most jobs need both, the tank plus the accessories that keep fluid clean and at the right level, so confirm what ships with the bare reservoir before adding parts.

Complete the System

A reservoir is one part of the power unit. Pair it with a Hydraulic Pump sized to the tank's suction port, and protect the oil with Hydraulic Filters on the return or suction line. Feed the work with Hydraulic Motors or Hydraulic Cylinders, route fluid through Hydraulic Hoses, and add Pneumatic Quick Couplers for fast line connections. For breathers, gauges, and other add-ons, see our full Hydraulic Accessories range.

Cross-Referencing an Obsolete Reservoir Tank

If the OEM tank on your power unit is discontinued or the casting number is no longer made, we can often match a current reservoir by capacity, material, port pattern, and mounting dimensions. Northern Hydraulics has supplied multi-manufacturer hydraulic parts since 1963, so we can work from a part number, the unit it came off, or measurements off the old tank. Send dimensions and port details, including any legible markings, and we'll identify an equivalent. Request a cross-reference and we'll confirm fit before you buy.

Hydraulic Reservoir Tanks – Frequently Asked Questions

How do I measure for the right reservoir tank size?

Start from your pump output: a common guideline is a tank capacity of about 2 to 3 times pump GPM, then increase it for high duty cycles or limited cooling. Also measure the available mounting space (length, width, height) and note port locations so the tank fits your plumbing. Verify the final size against your unit's requirements.

What materials are hydraulic reservoir tanks made from?

We stock steel and aluminum reservoirs. Steel is common on stationary and industrial power units, while aluminum reduces weight on mobile and vehicle-mounted setups. Both are offered in multiple capacities with side- and top-mount port options.

What thread types do the ports use?

Reservoir ports are typically NPT or SAE, depending on the tank. Check the suction, return, and drain port sizes and threads on the specific product listing, and match them to your pump and line fittings before ordering.

What is the difference between a reservoir and reservoir accessories?

A reservoir is the tank body that holds and cools the fluid. Reservoir accessories are the parts that complete or service it, such as breather caps, filler assemblies, sight and temperature gauges, suction strainers, and return fittings. Many builds need both.

Do I need a filter and breather with the reservoir?

Yes. A breather lets the tank vent as fluid level changes while keeping out contaminants, and a hydraulic filter on the suction or return line protects the pump and components. Confirm what ships with the bare tank, then add the breather, strainer, and filter your circuit needs.

Does the reservoir come with a pump or mounting hardware?

Tanks are generally sold as the reservoir body; pumps, fittings, and some mounting hardware are ordered separately. Pair the tank with a hydraulic pump sized to the suction port, and check each listing for what is included.

How fast do reservoir tanks ship?

In-stock reservoir tanks generally ship the same day from our warehouse in Great Falls, MT when ordered before the daily cutoff. Stock status is shown on the individual product page.

Can you cross-reference an obsolete or discontinued reservoir?

Often, yes. Send the old part number, the unit it came off, or measurements (capacity, material, port pattern, and mounting dimensions) and we'll identify a current equivalent and confirm fit before you buy. Request a quote to get started.

Hydraulic Reservoir Tanks

Shop by Hydraulic Reservoir Tanks Category:

Reservoir Accessories

Reservoirs

1-5/16-12 Sight Glass for Hydraulic Reservoir Tank, LSW-A16

HBF12 Breather Cap 3/4″ NPT

HBF16 Breather Cap 1″ NPT

Monarch Reservoir 14167

Monarch Reservoir 14168

Monarch Reservoir 14169

Monarch Reservoir 14157

Monarch Reservoir 14165

10 Gallon Steel Sidemount Hydraulic Reservoir Tank, A-3100

40 Gallon Steel Sidemount Hydraulic Reservoir Tank, A-3400

30 Gallon Steel Sidemount Hydraulic Reservoir Tank, A-3300

5″ Flush Mount Oil Level Gauge with Thermometer, LDR02A

25 Gallon Steel Sidemount Hydraulic Reservoir Tanks, A-3250

HBF8 Breather Cap 1/2″ NPT

HBF6 Breather Cap 3/8″, NPT

15 Gallon Steel Sidemount Hydraulic Reservoir Tank, A-3150

Monarch Reservoir 14159

BECO61AB Breather Cap 1-1/2″

HBF4 Breather Cap 1/4″ NPT

1-1/2″ Breather Cap, Williams 1013

07 Gallon Steel Sidemount Hydraulic Reservoir Tank, A-3107

1-5/8-12 Sight Glass for Hydraulic Reservoir Tank, LSW-A20

BECO61A Breather Cap Push-In Style, 1 1/2″

TC0015 Filler Breather Replacement Cap and Chain

TFA005715 Filler Breather Assembly With Screen

Oil Level Sight Gauge

How to Choose a Hydraulic Reservoir Tank

Which Reservoir Tank Is Right for the Job?

Complete the System

Cross-Referencing an Obsolete Reservoir Tank

Hydraulic Reservoir Tanks – Frequently Asked Questions

Quick Buy