Why Are Hydraulic Hoses Marked?

Most hydraulic hose manufacturers print identifying information directly on the hose cover. These markings are there to help determine the hose’s specifications without cutting it apart. Depending on the manufacturer, the printing may include part number, hose size, SAE specification, working pressure, and date of production. Some hoses also include temperature ratings or additional industry certifications. If the printing is still legible, it provides a great starting point when you’re replacing a hose assembly.

What Does the SAE Number Mean?

One of the most important markings you’ll see is the SAE designation. SAE stands for the Society of Automotive Engineers, now known as SAE International. This organization publishes industry standards that define the construction and performance requirements for many types of hydraulic hose. For example, you may see designations such as:

• SAE 100R1
• SAE 100R2AT
• SAE 100R12
• SAE 100R16
• SAE 100R17

These designations identify hose types covered by SAE J517. Each type has requirements for characteristics such as construction, dimensions, working pressure, bend radius, and performance testing. Here is a quick breakdown of some of the common SAE numbers:

• SAE 100R1 is a single-wire braided hydraulic hose commonly used for medium-pressure applications.
• SAE 100R2AT uses two layers of wire braid and is designed for higher-pressure hydraulic service than the R1 hose.
• SAE 100R12 is a four-spiral-wire hose intended for higher-pressure applications that require greater strength.
• SAE 100R17 is a compact, constant-pressure hose designed for high-pressure service. Its smaller outside diameter and tighter bend characteristics can make it useful in crowded installations.

The SAE designation helps narrow down the correct replacement, but it’s not the only factor you need to consider when picking a new hydraulic hose.

What Does the Pressure Rating Tell You?

Every hydraulic hose is designed to operate within a specific pressure range. The printed working pressure indicates the maximum continuous operating pressure the hose is designed to handle under normal conditions.

This number does not refer to the hose’s burst pressure. Manufacturers also establish minimum burst pressures during testing, but hydraulic systems should always be selected and operated using the published working pressure rather than the burst rating. Replacing a hose with one that has a lower working pressure than the original can create a serious safety risk.

How Do You Read the Hose Size?

Most hydraulic hoses also list a size designation. Many manufacturers use dash sizes that correspond to the hose’s nominal inside diameter.

For example:

• -4 typically represents a 1/4-inch inside diameter.
• -6 typically represents a 3/8-inch inside diameter.
• -8 typically represents a 1/2-inch inside diameter.
• -12 typically represents a 3/4-inch inside diameter.

Choosing the correct inside diameter is important because it affects hydraulic flow throughout the system. A hose that is too small may restrict flow and increase pressure loss, whereas one that is too large may not match the equipment manufacturer’s specifications.

Can You Order a Replacement Using Only the Hose Numbers?

The markings provide valuable information, but they may not identify everything needed to build a replacement assembly. You’ll also need to know the hose length and fitting type, size, and orientation.

Bringing your old hose to your trusted hydraulic distributor is your best bet for getting a comparable replacement. Even if some of the printing has worn away, the assembly itself usually provides enough information for an experienced hydraulic supplier to identify the correct replacement.

Need Help Identifying a Hydraulic Hose?

Dewald Fluid Power is here to help. We build custom hydraulic hose assemblies at our Mishawaka location, often while you wait, and we stock a wide range of hydraulic hose, fittings, adapters, and related components. If you have questions, stop by our Mishawaka counter, give us a call, or request a quote. Our team will help you identify the right hose assembly for your equipment.

The post What Do the Numbers on a Hydraulic Hose Mean? Reading SAE Specs and Pressure Ratings appeared first on Dewald Fluid Power.

What’s the Difference Between a 12V and 24V DC Hydraulic Power Unit?

Both systems perform the same basic job. They use a DC electric motor to drive a hydraulic pump that supplies pressurized fluid to cylinders or other hydraulic components. The primary difference is the voltage required to operate the motor. A 12V unit is designed for equipment with a 12-volt electrical system, while a 24V unit is built for equipment using a 24-volt electrical system. The hydraulic side of the system may look very similar. It’s the electrical requirements that determine which one is appropriate.

When Should You Choose a 12V Power Unit?

Twelve-volt power units are the most common choice for light and medium-duty mobile equipment because many vehicles and trailers already operate on 12-volt electrical systems.

Common applications include dump and utility trailers, pickup truck accessories, and RV hydraulic systems. If the equipment already has a 12-volt battery system, staying with a 12V hydraulic power unit is usually the simplest and most practical solution.

When Is a 24V Power Unit the Better Choice?

Twenty-four-volt systems are commonly found on larger commercial vehicles and equipment where the electrical system is already designed around higher voltage. You’ll often find 24V power units on:

• Heavy-duty trucks
• Commercial equipment
• Larger service vehicles
• Some municipal equipment
• Certain construction and industrial machines

These systems can be a good fit for demanding applications where the equipment manufacturer has standardized on a 24-volt electrical system.

Is One More Powerful Than the Other?

This is one of the most common questions we hear. The short answer is no. A 24V power unit is not automatically more powerful than a 12V model. Hydraulic performance depends on factors such as pump displacement, operating pressure, and flow requirements.

Voltage simply describes the electrical supply needed to operate the motor. A properly designed 12V system can perform exceptionally well when it’s matched to the application.

Can You Replace a 12V Unit With a 24V Unit?

Unless you’re also converting the entire electrical system, replacing a 12V unit with a 24V model isn’t recommended. Likewise, installing a 12V unit on equipment designed for 24 volts can create electrical and performance problems. Before ordering a replacement, verify the system’s voltage, battery configuration, and manufacturer recommendations. Matching the original voltage is almost always the safest approach.

What Else Should You Consider?

Voltage is only one part of selecting the right hydraulic power unit. You’ll also want to consider:

• Required operating pressure
• Flow rate
• Reservoir capacity
• Duty cycle
• Available installation space
• Control valve configuration
• Mounting requirements

Taking all of these factors into account helps ensure the replacement performs as expected once it’s installed.

What If You’re Replacing an Older or Obsolete Unit?

Many mobile hydraulic systems remain in service for years, even after the original power unit has been discontinued. If the identification tag is missing or replacement parts are no longer available, don’t assume the entire system has to be redesigned.

A supplier experienced with mobile hydraulics can often identify the original specifications, recommend a comparable replacement, or help configure a custom power unit that fits your application. Having photos of the existing unit, measurements, or part numbers can make the process much easier.

Choosing the Right DC Hydraulic Power Unit

Dewald Fluid Power designs and sources custom DC hydraulic power units for mobile applications, including trailers, trucks, snow equipment, RVs, and other hydraulic systems. If you’re unsure whether your equipment requires a 12V or 24V unit, our team can help identify the right configuration based on your electrical system and hydraulic requirements. We also stock hydraulic components and provide same-business-day quotes on most pump, cylinder, and valve requests. Contact us, and we’ll help you find the right solution for your equipment.

The post Should You Choose a 12V or 24V DC Hydraulic Power Unit? appeared first on Dewald Fluid Power.

What Is an FRL Unit?

FRL stands for Filter, Regulator, and Lubricator. These three components are often combined into a single assembly that prepares compressed air before it reaches valves, cylinders, air tools, or other pneumatic equipment.

Each piece has a specific job. The filter removes dirt, rust, water, and other contaminants from the compressed air. The regulator controls air pressure so downstream components receive a consistent supply. Finally, the lubricator introduces a controlled amount of oil into the air stream for equipment that requires lubrication.

Some pneumatic systems use all three components together, while others only require a filter and regulator. It depends on the equipment and the manufacturer’s recommendations.

What Does the Filter Do?

Compressed air isn’t always as clean as people expect. Moisture, pipe scale, compressor wear particles, and dirt can all travel through an air system. The filter helps remove those contaminants before they reach sensitive components. Like any filter, it requires periodic inspection and replacement. A clogged filter can restrict airflow and reduce system performance.

Why Is the Regulator Important?

Most pneumatic equipment is designed to operate within a specific pressure range. Too little pressure can reduce performance, while excessive pressure may shorten component life.

The regulator keeps air pressure at the desired setting, even if the incoming supply pressure changes. Proper regulation can help:

• Improve consistent cylinder movement.
• Protect valves and seals.
• Reduce unnecessary air consumption.
• Prevent excessive wear on pneumatic components.

If equipment performance changes throughout the day, pressure regulation is one area worth checking.

Do All Air Systems Need a Lubricator?

Years ago, many pneumatic systems relied on lubricators because air tools and valves were designed to operate with a constant supply of oil. Today, many modern pneumatic components are manufactured with pre-lubricated seals and are intended to operate without additional oil.

Before installing or removing a lubricator, it’s important to follow the equipment manufacturer’s recommendations. Once a system begins operating with lubricated air, switching back to dry air may not always be advisable for certain components.

How Do You Know If an FRL Unit Needs Maintenance?

Like any pneumatic component, an FRL assembly requires occasional inspection. Some common signs that maintenance may be needed include:

• Reduced airflow.
• Inconsistent operating pressure.
• Excess moisture in the air system.
• Dirty or damaged filter elements.
• Oil levels dropping too quickly in the lubricator.
• Visible damage to bowls or adjustment components.

Routine maintenance helps ensure the assembly continues protecting the equipment connected downstream.

Where Should an FRL Unit Be Installed?

In most applications, an FRL unit is installed as close to the equipment as practical. That allows the air to be cleaned and regulated immediately before entering the pneumatic circuit. Depending on the application, an FRL assembly may be installed at an individual machine, on a production cell, or near air tools and workstations. Proper placement helps ensure the conditioned air reaches the equipment before contaminants or pressure loss can become an issue.

Can You Replace Individual FRL Components?.

Although complete assemblies are common, many filter, regulator, and lubricator components can be replaced individually if only one section has failed or requires an upgrade. In some cases, replacing a filter element or regulator may be all that’s needed to restore proper system performance. An experienced pneumatic supplier can help determine whether a repair or complete replacement makes the most sense for your application.

Need Help with Pneumatic Components?

If you’re replacing an FRL unit or troubleshooting an air preparation issue, Dewald Fluid Power is here to help. We stock a wide range of pneumatic products, including filters, regulators, lubricators, cylinders, valves, fittings, and other air system components from trusted manufacturers. If you’re not sure which configuration is right for your equipment, our team can help identify the best solution for your application. Stop by our Mishawaka counter, give us a call, or request a quote, and we’ll help you keep your pneumatic system operating reliably.

The post What Is an FRL Unit, and Do You Need One for Your Air System? appeared first on Dewald Fluid Power.

What Is the Bore Size?

The bore is the inside diameter of the cylinder barrel. It is one of the biggest factors in determining how much force the cylinder can produce. Generally speaking, a larger bore allows the cylinder to generate more pushing force at the same hydraulic pressure. That’s why bore size is usually selected based on the amount of force the application requires.

Keep in mind that simply choosing the largest available bore is rarely the right answer. The cylinder needs to match both the machine and the hydraulic system supplying it.

How Is Stroke Measured?

Stroke is the distance the rod travels between its fully retracted and fully extended positions. Think of it as the cylinder’s range of motion. If the stroke is too short, the equipment won’t complete its intended movement. If it’s too long, the cylinder may overextend or interfere with surrounding components.

When measuring stroke:

• Measure the distance the rod actually travels.
• Don’t confuse stroke with the cylinder’s overall closed length.
• Verify the measurement before ordering a replacement.

For existing equipment, matching the original stroke length is usually the safest approach.

Why Does Rod Diameter Matter?

The rod is the chrome-plated shaft that extends from the cylinder to move the load. A rod that is too small may flex under heavy loads, while a larger rod offers greater resistance to bending and buckling.

Applications that experience heavy loads or long strokes often require larger rod diameters to maintain reliable performance.

What Mounting Style Does the Cylinder Use?

Even if every other specification is correct, the cylinder still has to attach properly to the equipment. Mounting style determines how the cylinder is installed and how force is transferred during operation. Common mounting styles include:

• Clevis mounts
• Cross tube mounts
• Trunnion mounts
• Flange mounts
• Foot mounts

When replacing a cylinder, matching the mounting configuration is just as important as matching the hydraulic specifications.

What Other Information Should You Gather?

While bore, stroke, rod diameter, and mounting style are the primary specifications, they are not the only details that matter. Other helpful information includes:

• Operating pressure
• Port size and thread type
• Retracted and extended length
• Seal requirements
• Equipment manufacturer
• Part number, if available

If you’re replacing an older cylinder, bringing the original component or several clear photos can often make identification much easier.

Can You Replace an Older or Obsolete Hydraulic Cylinder?

Not every cylinder is still in production, especially on older equipment. Fortunately, that doesn’t necessarily mean you’re out of options.

An experienced hydraulic supplier can often identify the original specifications and recommend a comparable replacement part. Additionally, a custom cylinder solution is a great option when a direct replacement isn’t available.

Need Help Finding the Right Hydraulic Cylinder?

Dewald Fluid Power stocks hydraulic cylinders from trusted manufacturers, provides same-business-day quotes on most cylinder requests, and helps customers identify replacement components for a wide range of equipment.

If a standard replacement isn’t available, our team can also help with custom hydraulic solutions and application support. Stop by our Mishawaka counter, give us a call, or request a quote, and we’ll help you find the right cylinder for your equipment.

The post How Do You Spec a Hydraulic Cylinder? Bore, Stroke, Rod, and Mounting Explained appeared first on Dewald Fluid Power.

What Measurements Do You Need?

There are four pieces of information that are most important when replacing a hydraulic hose:

• Overall hose length
• Hose inside diameter
• Fitting type
• Fitting orientation

If you can identify those four items, you’re well on your way to getting the correct replacement. If you’re unsure about any of them, don’t worry. An experienced hydraulic supplier can often identify the details from the old hose.

How Do You Measure Hydraulic Hose Length?

The first step is determining the hose length. If you still have the original assembly, measure it from one fitting seat to the other, not simply from end to end. Different fitting styles are measured slightly differently, so measuring to the sealing surface provides the most accurate overall length.

Keep in mind that hydraulic hoses are designed with a specific length for a reason. A replacement that’s too short can become overstressed during equipment movement, while one that’s too long may rub against nearby components or create unnecessary bends.

How Do You Determine the Hose Size?

The next step is identifying the hose diameter. Many hydraulic hoses have size information printed directly on the outer cover. If the printing is still legible, it’ll probably list the hose size, pressure rating, manufacturer, and part number.

If the printing has worn away, the inside diameter can be measured after removing the hose, or it can often be identified by the fittings attached to the assembly.

Using the right hose size is just as important as getting the length right. An undersized hose can restrict hydraulic flow, while an oversized hose may not match the system’s design and cause leaks.

How Do You Identify the Fittings?

This is where many replacement projects become more challenging. Two fittings may look almost identical but have completely different thread types or sealing methods. Installing the wrong fitting can result in leaks, damaged threads, or components that simply won’t connect.

The most common hydraulic fitting styles are JIC, ORFS, NPT, and BSPP. If you’re trying to figure out what kind of fitting your system needs, look at:

• Whether the threads are straight or tapered
• The thread diameter
• Thread pitch
• The sealing surface
• Whether an O-ring is present

If you’re unsure, bringing the old hose assembly with you is usually the fastest and most accurate approach.

Why Does Fitting Orientation Matter?

Some hydraulic hoses use straight fittings on both ends. Others have 45-degree or 90-degree elbows that must point in a specific direction. This is known as fitting orientation.

If the angles are incorrect, the hose may twist during installation or fail to route properly around other components. Before removing the old assembly, it can be helpful to take photos of how it is arranged. This will make installation much easier later.

What If You Don’t Know Any of the Measurements?

That’s more common than you might think. Many customers simply bring the old hose to our counter, and we help identify the hose size, fittings, and overall length. If the hose is badly damaged, photos of the equipment or the mating components can also be helpful.

In some cases, especially with older or imported equipment, additional measurements or part identification may be necessary. That’s another reason it’s helpful to work with a supplier that handles hydraulic hose assemblies every day.

Need a Replacement Hydraulic Hose?

If you’ve got a hydraulic hose that’s leaking, worn out, or completely blown, Dewald Fluid Power can help. We stock a wide selection of hydraulic hoses, fittings, and related components, and we build custom hydraulic hose assemblies at our Mishawaka location, often while you wait. Stop by our Mishawaka counter, give us a call, or request a quote to get started.

The post How Do You Measure a Hydraulic Hose for Replacement? appeared first on Dewald Fluid Power.

1. Why Is My Hydraulic System Losing Power?

When a system can’t lift or push as it used to, pressure is usually the first suspect. Before assuming the pump has failed, take a step back and look at the basics.

Start by checking the fluid level and looking for any visible leaks. Then consider whether the pressure relief valve could be stuck open or set too low. Internal leakage inside a worn cylinder can also rob the system of usable force without leaving obvious external signs.

2. Why Is My Hydraulic System Running Slowly?

If everything still works but moves at a crawl, you’re likely dealing with a flow issue. A restriction somewhere in the hydraulic system is the most likely culprit. Inspect the system for:

• Clogged filters
• Blocked suction lines
• Worn pump components

If performance improves after the system warms up, fluid viscosity is also worth considering.

3. Why Is My Hydraulic Pump Making Noise?

A healthy hydraulic pump has a steady, predictable sound. Whining or rattling often points to air entering the system or cavitation caused by restricted flow on the suction side. Low fluid levels, clogged strainers, or loose fittings can all contribute. Ignoring unusual noise can turn a minor issue into a major repair if the pump continues to run under poor conditions.

4. Why Is My Hydraulic Fluid Overheating?

Heat is normal in hydraulic systems, but excessive heat is not. If the reservoir feels hotter than usual, something is forcing the system to work harder than it should. Here are some potential issues that can cause overheating:

• Dirty coolers
• Internal leakage
• Wrong type of hydraulic fluid
• Overworking machinery

5. Why Are My Hydraulic Cylinders Drifting?

A cylinder that won’t hold position can be frustrating, especially when the load slowly creeps down over time. Sometimes the issue is visible, like a leaking hose or fitting. Other times, the problem is internal. Worn piston seals or leaking control valves can allow fluid to bypass where it shouldn’t. Diagnosing internal leakage may require isolating parts of the circuit or performing pressure tests.

6. Why Is My Hydraulic Hose Leaking?

Not every leak means the hose itself has failed. In many cases, the issue is at the connection point. Take a close look at fittings and crimp areas first. If the hose shows signs of abrasion, cracking, or twisting, replacement is usually the safest option. Hoses that are bent too tightly near fittings or routed incorrectly tend to fail prematurely.

7. Why Does My Hydraulic System Feel Jerky or Inconsistent?

Hydraulic motion should be smooth. When it becomes erratic, something is interfering with consistent fluid flow.

Some reasons for jerky movement include:

• Air in the system
• Contaminated fluid
• Sticky valves
• Worn pumps
• Loose connections

8. Why Do Hydraulic Components Keep Failing?

If you’re replacing the same part over and over, it’s worth asking why. Repeated failures often point to a deeper issue in the system. Contaminated fluid, incorrect pressure settings, or misaligned components can all shorten the life of new parts. Using the wrong replacement component or operating beyond design limits can also lead to premature failure.

9. How Can I Tell If My Hydraulic Fluid Is Contaminated?

Hydraulic fluid doesn’t have to look terrible to cause problems, but there are some clear warning signs:

• Cloudy or milky fluid
• Burnt smell
• Dark color
• Filters filling quickly
• Sluggish system

When Should I Repair a Hydraulic Component Instead of Replacing It?

There isn’t a one-size-fits-all answer. The right choice depends on the condition of the component, how easy it is to source a replacement, and how critical the equipment is. Simple items like hoses and fittings are usually replaced fairly often. More complex components may be worth repairing, especially if they are hard to find or part of older equipment. In some cases, a custom solution may be the best path forward.

Need Help Diagnosing a Hydraulic Problem?

Some hydraulic issues have obvious solutions. Others take a little more detective work. If you’re chasing a leak, replacing a worn hose, trying to match an older valve, or looking for a replacement pump or cylinder, Dewald Fluid Power is here to help. We stock thousands of hydraulic and pneumatic parts, build custom hydraulic hose assemblies while you wait in many cases, and provide same-business-day quotes on most pump, cylinder, and valve requests. If a standard replacement isn’t available, we can also help with custom hydraulic power units and other application-specific solutions.

Stop by our Mishawaka counter, give us a call, or contact us for a quote. We’ll help you get your equipment back to work as quickly as possible.

The post Hydraulic System Troubleshooting: 9 Common Problems and How to Diagnose Them appeared first on Dewald Fluid Power.

The frustrating part is that JIC, ORFS, NPT, and BSPP fittings can look nearly identical at a glance, even though each one seals in a completely different way. Mix them up, and you risk stripped threads, chronic leaks, or downtime you can’t afford.

Once you know what to look for, namely thread angle, taper, and how the seal actually forms, telling them apart gets a lot easier. Here’s a plain-English breakdown of all four, where you’ll find them and how to get the right one the first time.

JIC: The North American Workhorse

JIC (Joint Industry Council) fittings are the connection you’ll run into most often on mobile and industrial equipment in North America. They seal on a 37-degree flare, where the male and female ends meet metal-to-metal as you tighten them, and no thread sealant is needed, since the threads themselves are just there to pull the flare together. That design also makes JIC easy to service: as long as the flare and sealing surfaces aren’t damaged, you can disconnect and reconnect without losing the seal.

You’ll find JIC fittings on agricultural equipment, construction machinery, hydraulic cylinders, and most mobile hydraulic systems.

ORFS: Built for High Pressure and Vibration

ORFS (O-Ring Face Seal) fittings trade the metal flare for an O-ring compressed against a flat face. That small change makes a real difference: the O-ring absorbs minor imperfections and vibration that would eventually work a flare connection loose, which is why ORFS shows up so often on high-pressure circuits and heavy-duty equipment where leak resistance matters more than anything else. If a JIC connection on a piece of equipment keeps needing to be retorqued, ORFS is often the upgrade that solves it for good.

NPT: Tapered Threads, Different Job

NPT (National Pipe Thread) is one of the oldest standards still in everyday use, and it works differently from JIC and ORFS in an important way: the threads themselves create the seal. As a tapered NPT fitting tightens, the threads wedge together, which is why these connections almost always need a thread sealant like PTFE tape. You’ll see NPT on air and water lines and general utility equipment, but it’s not the go-to choice for high-pressure hydraulic hose assemblies that need to come apart and go back together repeatedly.

BSPP: The Import Equipment Standard

BSPP (British Standard Pipe Parallel) fittings turn up most often on European and imported machinery. Unlike NPT, the threads are parallel rather than tapered, and they’re not what creates the seal. That job goes to an O-ring or a bonded sealing washer at the fitting face. Here’s the mistake we see most often at the counter: because BSPP and NPT threads look similar in size, technicians assume they’re interchangeable. They’re not, and forcing the two together is one of the fastest ways to ruin a port.

Identifying the Fitting in Your Hand

If you’re not sure what you’re working with, a few quick checks will narrow it down fast:

• Run a finger or straightedge along the threads: tapered means NPT, straight
• means JIC, ORFS, or BSPP
• Look for a visible 37-degree flare. That’s JIC
• Check for an O-ring sitting against a flat face. That’s ORFS
• Look for a bonded sealing washer. That’s a strong sign of BSPP
• Measure thread diameter and pitch with calipers and a thread gauge for final confirmation

Two fittings that look like they’ll thread together can still have different pitch, angle, or diameter. When in doubt, don’t force it. Forcing mismatched fittings damages threads and sealing surfaces and sets you up for a repeat failure.

Bring Us the Fitting, and We’ll Match It

Fitting identification is something our team at Dewald Fluid Power handles every day, whether it’s a skid steer, a dump trailer, an excavator, or a custom industrial system. We carry the inventory to build a custom hydraulic hose assembly with the exact fitting your equipment needs, and we can source replacement components even when the original isn’t something off the shelf. If you’re not sure what you’re holding, bring the old hose or fitting by our Mishawaka location and we’ll match it on the spot. No guesswork, no forcing the wrong connection into place.

The post How to Tell JIC, ORFS, NPT, and BSPP Hydraulic Fittings Apart appeared first on Dewald Fluid Power.

That’s the gap a DC hydraulic power unit fills. It’s a compact, self-contained system that runs on a 12-volt or 24-volt battery instead of building power, so it can go wherever the equipment goes.

Here’s what one actually is, how it works, and how to know whether your equipment needs one.

What a DC Power Unit Actually Is

A DC hydraulic power unit packages everything you need into a single assembly: a DC electric motor, a hydraulic pump, a fluid reservoir, and control valves. Instead of pulling AC power from a facility, the motor draws current directly from a battery, which is what makes the whole unit portable.

Because the components ship as one combined package rather than separate parts to plumb together, these units are popular with equipment manufacturers who need a hydraulic solution that bolts on and works.

How It Works

Battery power energizes the DC motor, which turns the pump. The pump pulls fluid from the reservoir and sends it, under pressure, through valves and hydraulic lines to do the actual work: raising a bed, extending an outrigger, or running a lift gate. Once the cycle finishes, fluid returns to the reservoir and sits ready for the next pull.

Most of these applications don’t run continuously. They need a short burst of power a handful of times a day, which is exactly the duty cycle a DC unit is built for. A dump trailer bed might cycle a few times per load, then sit idle for hours, and the battery never has to work harder than that.

Where You’ll Find Them

DC hydraulic power units show up anywhere equipment needs to operate independently of facility power:

• Dump trailers and dump trucks
• Snowplows and tilt trailers
• Service trucks and tow trucks
• Lift gates and mobile work platforms
• Agricultural equipment and RV systems

A dump trailer is a good example: a 12-volt power unit wired straight to the trailer battery lets the operator raise and lower the bed with no external power source required, anywhere the trailer can be parked.

Why Equipment Builders Choose DC

• Compact footprint. Significant hydraulic power without eating up the limited space on a trailer or mobile rig
• Independent operation. Runs on battery power, so it works on remote job sites and in the field, no facility power needed
• Simplified installation. Motor, pump, reservoir, and controls arrive as one assembly, cutting down on plumbing and wiring
• Reliable performance. Proven, simple design that holds up in demanding conditions when properly sized
• Built to spec. Pressure, flow, voltage, reservoir size, and controls can all be configured to match the application instead of forcing a one-size-fits-all unit onto it

Signs You Might Need One

A DC power unit is worth considering if your equipment operates off-grid, runs on battery power, needs intermittent rather than continuous hydraulic force, or simply can’t spare the space for a full AC system.

It’s also worth a second look if your current power unit is oversized, hard to maintain, or built around parts the manufacturer no longer supports. The same goes for a unit that’s already failed: rather than chase obsolete replacement parts, a properly sized custom build often restores function and improves performance at the same time. Sizing matters here too. Oversizing drives up cost and hurts efficiency, while undersizing wears components out early, so matching the unit to actual pressure, flow, and duty cycle requirements is worth getting right up front.

Built Right, From Dewald Fluid Power

DC hydraulic power units are one of our core specialties at Dewald Fluid Power. We stock ready-to-ship 12V and 24V units for dump trailers, lift gates, and tilt trailers, and our engineering team designs and builds custom configurations for applications that need something more specific. Browse our DC Power Solutions catalog or contact our team directly, and we’ll help you find or build the right power unit for your equipment.

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