Archive: Oct 2026

How to Fight Hidden Air in Hydraulic Tanks

Comments Off on How to Fight Hidden Air in Hydraulic Tanks

Hydraulic tank illustration showing air bubbles in hydraulic oil and fluid circulation. Text reads: “Air in your oil? You might need tank optimization. Ask the experts.”

Your reservoir is more than just a holding space for hydraulic fluid.


“If the reservoir isn’t leaking, all is well, right?”


Actually, the hydraulic tank assembly plays a critical role in removing damaging air contamination from your fluid!


Despite being the central pillar of controlling air contamination, many reservoirs aren’t well-optimized for the job. Even reservoirs that perform adequate deaeration might be secretly weighing down the system and the oil budget.


How can air contamination affect my hydraulic system?


Discussions around contamination usually focus on solid particulates and water. But what happens to a hydraulic system when it becomes contaminated by air?

If not controlled, air contamination targets system components, overall oil condition, and machine efficiency:


  • Accelerated Oil Aging: Oxygen in the air speeds up the aging of oil.
  • Varnish / Gel-Like Buildup: Oil aging byproducts like varnish can foul and damage hydraulic system components.
  • Cavitation: Air bubbles can collapse so violently under high pressure that physical damage occurs.
  • Microdieseling: Air bubbles may also combust under high pressure, literally burning the surrounding oil & speeding up aging and byproduct formation.
  • ‘Spongy’ Hydraulics: Compressible air can cause delayed responses in the machine’s actions.
Close-up of pitting and surface erosion on a metal hydraulic component, illustrating potential cavitation damage associated with air contamination in hydraulic systems.

Cavitation Damage


How does a hydraulic reservoir influence deaeration?


Unfortunately, it’s impossible to completely eliminate air in a hydraulic system, so best way to handle air in your oil is to influence how the air behaves.

Enabling deaeration involves encouraging any bubbles to coalesce and escape the oil. In a hydraulic system, the hydraulic reservoir is where this deaeration happens.

Ideally, any air bubbles that form in the hydraulic fluid will exit the fluid and disperse into the open headspace of the reservoir.


The key to air removal in the reservoir is reducing fluid turbulence in the reservoir.

Fast, turbulent flow in the reservoir keeps air bubbles circulating and suspended in the fluid for longer. In extreme cases, flow may be high enough that it causes surface disruptions that draw more air into the fluid.

A tank assembly that can reduce the turbulence of flow allows air bubbles to coalesce, rise, and escape from the oil more easily. This can be accomplished with thoughtful tank geometry and carefully selected in-tank filtration.

Eliminating turbulence is also critical for keeping air out of suction lines. The longer air bubbles remain in the reservoir before being drawn into the suction lines, the better their chance of coalescing and escaping the oil. Reducing turbulence is a good way to boost air residence time.

Air in hydraulic tanks illustrated by bubbles in hydraulic oil above a 3D reservoir model showing simulated fluid-flow patterns for tank optimization.

One of the ways that conventional reservoir designs have tried to increase air residence time and combat flow turbulence is by simply making the reservoir bigger.


Increased volume can dampen turbulent flow and increase air residence time…but oversized reservoirs come with some major downsides:


  • Larger reservoirs require more oil, which drives up oil-related costs.
  • Bigger, heavier reservoirs increase overall equipment weight and reduce energy efficiency.
  • With a bigger tank assembly, less space is available for design innovations and other useful features.
Close-up illustration of golden hydraulic oil droplets splashing into a pool of oil, creating ripples across the surface.

How can Tank Optimization and Air Fusion Technology filtration improve my reservoir?


Schroeder Industries’ Tank Optimization uses specialized digital simulations to analyze the existing properties of a tank, identifying inefficiencies in the design. From there, our tank assembly and hydraulic system experts develop a solution that optimizes deaeration and improves overall tank performance.

When paired with purpose-built deaerating filtration, this optimization and redesign process often enables significant reservoir downsizing.



When Tank Optimization meets Air Fusion Technology, reservoir deaeration is maximized.



Hydraulic reservoir with simulated fluid-flow patterns and an Air Fusion Technology (AFT) filtration element. Text highlights potential tank downsizing of up to 60%.

See how these real Schroeder Industries clients achieved significant tank assembly downsizing by combining deaerating filters with Tank Optimization:



Tank Optimization + AFT Produces 77.8% Reservoir Reduction


An OEM producing ride-on snow removal equipment, wanting to be more competitive in the market, sought solutions to improve their hydraulic oil cleanliness and optimize their systems.

By combining Tank Optimization with the advanced deaeration of Air Fusion Technology filtration, Schroeder Industries was able to downsize the reservoir from 9 gallons to 2 gallons, allowing the customer to improve their equipment design and become more competitive!

Agricultural field with a hydraulic reservoir showing simulated fluid-flow patterns and an Air Fusion Technology (AFT) filtration element for hydraulic tank optimization.

Here’s how Tank Optimization and Air Fusion Technology helped this customer:


Reservoir Downsized by 7 Gallons and 51lbs (77.8%)


Design Improvements: Runs 2x Longer Than Competitor


Nearly $100 USD Initial Cost Savings Per Unit






Tank Optimization + AFT Nearly Halves Reservoir Volume


An OEM manufacturing mobile seed tending equipment sought to assess the performance of their reservoirs and improve their tank design.

This particular customer was producing their own 12-gallon reservoirs in house. Not only could Tank Optimization improve their reservoir design, but any volume reduction would lessen the materials required for manufacturing.

This Tank Optimization, combined with the fixed head Air Fusion Technology configuration (AFTF), was able to downsize the 12 gallon reservoir by almost half.

Tank optimization

Here’s how Tank Optimization and Air Fusion Technology helped this customer:


42% Reservoir Downsizing (5 Gallon Reduction)


3,750 Gallons of Oil Saved Across 750 New Units


$40K Reduction in Oil Costs through Tank Optimization





Ask the experts if your reservoir could use Tank Optimization!


Find out what’s happening inside your tank:


Request for Quote

  • Which products are you interested in?
  • Max. file size: 256 MB.

Compact Diesel Filtration Powerhouse: HDP120

Comments Off on Compact Diesel Filtration Powerhouse: HDP120
HDP120 Exceptional onboard diesel fuel filtration for system flow rates up to 31 gph

Introducing high-performance diesel filtration for engines up to 31 gph.


Meet the smallest—but certainly not the least—addition to Schroeder’s high-performance onboard diesel fuel filtration lineup.

The HDP120 brings Schroeder’s signature filtration performance to compact, off-highway diesel systems.


  • Dual Function: Acts as a particulate diesel fuel filter and water separator using the same two-stage element formula found in Schroeder’s larger filters.
  • High Performance Stability: Provides efficient water separation on the clean side of the filter throughout its entire service life.
  • Exceptional Filtration: Offers higher diesel filtration efficiency and overall filter life.
  • Maintenance-Friendly: Simple, fast filter element replacements help your equipment return to duty faster.
  • Quality Protected: Guaranteed filtration quality; only operable with the use of valid replacement filter elements.
HDP120 diesel fuel filter
View Product Request a Quote

Filter Housing Specifications:

Flow Rating:Up to 31 gph (up to 120)
Max. Operating Pressure:<14.5 psi, (<1 bar absolute) suction side application
Temperature Range:-40 °C to 100 °C
Nominal Voltage:WIF: 12/24VDC
Porting Thread:SAE 04 ORB

Applications Include:

  • On-board engine ACon
  • Fuel Burner Filtration
  • Compact Ag & Construction Machinery
  • Small Diesel Gensets

Markets Served Include:


Agriculture Automotive Manufacturing Defense Marine Mining Mobile Vehicles Oil & Gas Power Generation Rail Recreation Refuse Steelmaking Water Treatment


Part of a comprehensive line of onboard diesel fuel filtration solutions.


Schroeder Industries has an HDP diesel filter for virtually every engine.

Our exceptional onboard diesel filtration meets stringent modern cleanliness standards and keeps operations moving forward across the globe. Discover solutions serving everything from compact mobile equipment to massive ship engines and power generators:

Image of Schroeder Industries HDP diesel fuel filter selection ranging from less than 75 horsepower to over 2,000 horsepower
View All Onboard Diesel Filtration Request a Quote

Why is effective diesel filtration so important?


Modern Tier IV diesel engines have exceptionally low tolerance for solid contamination.

The components in a high pressure common rail (HPCR) engines experience incredibly high pressure. Because of this, the cleanliness standard for injected fuel is significantly stricter than hydraulic cleanliness standards.

For injectors and other fuel system components to meet their standard operating lifespan, fuel must meet an ISO Target of <12/9/6 as it enters the injector.

This target represents 16x greater sensitivity than a typical modern hydraulic system!

Replacing a single fuel injector can cost thousands of dollars. Multiply that by a 6 or 8 cylinder engine, and the cost of contamination skyrockets.


Onboard diesel fuel filters are the last line of defense.

Diesel fuel must be filtered at all stages, from the storage and filling phase to final injection. Onboard diesel filtration is the final line of defense for the hyper-sensitive, expensive components that comprise a modern diesel engine.


Talk to the contamination control experts:

Our team of fuel filtration experts can help you determine the right diesel filter for your application.

Request for Quote

  • Which products are you interested in?
  • Max. file size: 256 MB.