How to Crimp Hydraulic Hose Fittings - The Final Guide

The process of preparing, crimping, and maintaining hydraulic hoses and fittings is meticulous and requires attention to detail at every stage. From gathering the correct tools and materials to ensuring compatibility between hoses and fittings, each step is critical to the overall safety and efficiency of the system. Calibration and safety checks on the crimping machine set the stage for the actual crimping process, followed by a rigorous post-crimping inspection. Troubleshooting common problems and regular maintenance are also critical to the system’s longevity. This guide describes all the operations involved in crimping hose fittings, so please continue to follow us for more information.

Tools and Materials

Prepare the equipment

First, gather all the tools and materials you will need. This is not only to get organized but to ensure a smooth and safe operation. Below is your checklist:

  • Hydraulic hoses
  • Fittings
  • Crimping machine
  • Calipers or tape measure
  • Lubricant
  • Safety equipment (gloves, goggles)

Hydraulic hoses

Select hydraulic hoses that are compatible with the fluid being used. The hose should also meet the pressure requirements of the system. Keep in mind that high-quality hoses last longer and are a cost-effective choice in the long run.


Choose fittings that are compatible with the hose. Choose fittings that are the same size and material as the hose. Mismatched fittings can lead to leaks and even system failure.

Hose Saw

A hose saw ensures precise cuts, setting the stage for a secure crimp. Don’t skimp on this; accuracy here sets the tone for the entire process.

hydraulic Fitting crimp preparation Topa

Crimping Machine

Invest in a reliable crimping machine. This is a core part of your operation, so don’t cut corners. A good machine will provide you with a consistent, high-quality crimp that will save you time and money in the long run.

Measuring Tools

You’ll need calipers or a tape measure to ensure accurate measurements. This is critical to achieving a secure fit of the hose to the fitting.


Lubricant helps insert the fitting into the hose. It also minimizes tool wear.

Safety Gear

Never underestimate the importance of safety gear. Gloves protect your hands and goggles keep any impurities out of your eyes.

hose crimp machine Topa

Pre-crimping Preparation

Preparation is key before you begin crimping. Proper preparation ensures a secure, long-lasting connection that can withstand the stresses of a hydraulic system.

Choosing the right hose

Compatibility is paramount: Make sure the hose is compatible with the hydraulic fluid being used. Mismatches can lead to leaks and even system failure.

Value for money: Don’t settle for less. Consider the durability of the hose and how often it needs to be replaced. Sometimes spending a little more up front can save you money in the long run.

Choosing fittings

Material Matters: Fitting material should be compatible with hydraulic fluid. Stainless steel is usually a good choice.

Size and shape: Make sure the size and shape of the fitting matches the hose. This will ensure a tight, leak-free connection.

Value for money: As with hoses, consider the long-term value. A slightly more expensive but more durable fitting may be a wise investment.

Measure twice, cut once

Use calipers or a tape measure to accurately measure the length of the hose you need. This avoids waste and ensures a tight fit with the fitting.

measure hydraulic hoses Topa
hydraulic hoses crimp Topa

Marking depth

Before inserting the hose into the fitting, apply some lubricant to ease the process. Push the hose into the fitting as far as it will go, then mark the depth with chalk or a marker. This way, you can double-check after crimping to make sure it’s safe.

Cleaning is critical

Before proceeding, clean the hose and fittings to remove any contaminants. This reduces the risk of system failure due to dirt or debris.

Loading specifications

Before starting to crimp, ensure that the correct specification has been loaded into the crimper by selecting the correct die and ferrule for the hose diameter.

Crimping Process


Ensure that the crimping machine is ready for use before touching the hydraulic hose.

Calibration: This is not a simple operation. Calibrate the machine for the hose and fittings being used. An improperly calibrated machine can result in a weak crimp, which can lead to failure.

Safety check: Make sure all safety features are enabled. Wear your goggles and gloves for your personal safety.


Before you even think about crimping, it’s important to align first. Place the hose and fittings side by side to ensure they are perfectly aligned. This step is critical because even a slight misalignment can result in an uneven crimp. Uneven crimping isn’t just an aesthetic issue; it can lead to leaks and even catastrophic system failure.


When you begin inserting the fitting, lubricate both ends of the hose. Not only will this ease insertion, but it will also minimize wear and tear on the hose and fitting. After inserting the hose into the fitting, pause and double check the alignment. If all is well, you can use a cork hammer to gently tap the fitting to make sure it is secured at the insertion mark you made earlier.

Machine Operation

Now that the hose and fitting are fully aligned and inserted, the next step is the big one – crimping. Place the hose and fitting into the crimping machine, making sure the fitting is positioned just above the mold. Double check any other settings on the machine before pressing the crimp button. Crimp pressure must be just right; crimping too tightly or too loosely can lead to hose failure. If you are unsure of the crimping procedure or machine parameters, consult your supplier immediately. It is better to ask than to risk a failed crimp.

Quality check

You have completed the crimping, but it is not over yet. Before removing the hose from the machine, grab a caliper and measure the crimp diameter.  Compare the measurement to the specifications provided by the supplier or manufacturer. If the numbers match, you have successfully completed a perfect crimp. If they don’t match, you’ll need to adjust the machine settings and try again. 

Post-crimp Inspection

You have calibrated the machine, aligned the hoses and fittings, and successfully completed the crimp. But the job isn’t over yet. The post-crimp inspection is the last line of defense against potential system failure. It’s the final and critical step in ensuring the safety, efficiency and longevity of your hydraulic system. Let’s take a closer look.

Visual Inspection

Inspect the crimp: Carefully inspect the crimp to make sure it is even all around. Uneven crimps are not only a cosmetic problem, they also create weak points that can fail under pressure.

Installation position: Carefully check the position of the joint. If it moves during the crimping process, the crimp is not perfect.

 Check the hose for any visible signs of wear, such as cracks or abrasions. A damaged hose is a ticking time bomb that could result in system failure or injury to personnel.

Measurement Verification

Crimp Diameter: Use calipers to measure the crimp diameter. Compare this measurement to the manufacturer’s specifications to ensure it is within acceptable limits.

Hose Length: Check the length of the hose to make sure it has not stretched or contracted during the crimping process. Any noticeable change in length may affect system performance.

Installation Depth: Refer to markings made prior to crimping. Ensure that the fitting is inserted at the correct depth as this is essential for a secure fit.

hydraulic hose measure Topa

Pressure Test

Initial Test: Start with a low-pressure test to identify any immediate problems, such as leaks or weak spots. This is the first opportunity to identify problems before they escalate.

High-Pressure Test: Gradually increase the pressure to the hose’s maximum working limit. Look out for any leaks or deformation that may occur under high pressure.

Continuous Pressurization: Maintain the maximum pressure for a set period of time (usually about 30 minutes to an hour) to ensure that the hose is able to withstand long-term operating pressure. This is the ultimate guarantee of a safe and reliable hydraulic system.

Troubleshooting Common Problems

Even with the best preparation and execution, problems can occur. Knowing how to troubleshoot common problems can save time and money and potentially prevent dangerous situations from occurring. Let’s dive into some of the most common problems you may encounter.

Incomplete crimp

Symptom: The hose slips out of the fitting, or you notice a visible gap in the crimp.

Solution: Recalibrate the crimper and double-check the die size. Make sure you are using the correct pressure to complete the crimp.


Symptom: Hose and coupling are not perfectly aligned, resulting in an uneven crimp.

Solution: Re-align the hose and fitting to ensure they are perfectly parallel before crimping. If necessary, use a cork mallet to gently tap the fitting into the correct position.


Symptom: Fluid leaks at connection points can lead to reduced system efficiency and potential failure.

Solution: Double-check the compatibility of fittings and hoses. Make sure crimp pressure is within specified limits. If leaks persist, consider replacing hoses or fittings.


Maintenance Tips

Proper maintenance ensures the long life of the hydraulic system, which determines whether the system will run smoothly for many years. Here we present some basic maintenance tips to extend the life of hydraulic hose fittings.

Regular Inspections

Visual Inspection: Periodically inspect hoses and fittings for any signs of wear, cracks, or leaks. A quick visual inspection can catch problems before they become major issues.

● Pressure Tests: Perform regular pressure tests to make sure the system can handle the operating load. This can help you identify weaknesses that may need attention.

Proper Storage

● Climate control: Store hoses and fittings in a climate-controlled environment to prevent premature aging due to temperature fluctuations.

Organized inventory: Maintain an organized inventory to locate and replace parts quickly, reducing downtime during maintenance or repair.

When to Replace Hoses and Fittings

● Material Fatigue: Look for signs of material fatigue, such as cracking or discoloration. These are telltale signs that replacement is needed.

● Operational Failures: If you’re experiencing frequent operational problems such as pressure drops or leaks, it may be time to replace some parts.


Crimping hydraulic hoses and fittings involves multiple steps, each with its own best practices and quality checks. Follow all of our steps closely and you can complete the crimping task perfectly. Post-crimp inspections and pressure tests ensure the reliability of your system, while regular maintenance extends its service life. If you are in doubt about how to operate and use a crimping machine, contact us for help!

Why Choose Topa?

When it comes to hydraulic systems, the quality of your hoses and couplings can make or break your operation. That’s where Topa comes in. With over 15 years of experience in the hydraulics industry, Topa offers a full line of hydraulic fittings and hoses to meet the most advanced safety and quality requirements.

Topa offers a variety of thread standards such as metric, JIC, BSP and NPT. Whether you need standard or customized fittings, Topa has you covered.

Topa’s hydraulic fittings are compatible with leading brands such as Parker, Manuli, Eaton and Gates. This ensures seamless integration into existing hydraulic systems.

Topa utilizes a strict quality control system. From material testing to spot checks and full thread testing, each fitting undergoes multiple layers of quality checks.

Topa products comply with international standards such as ISO, SAE and DIN. We also have CE, TUV and BV certifications to ensure you get products that meet global quality standards.

With the experience of our excellent workers and engineers, Topa not only provides products, but also valuable knowledge and solutions for hydraulic hoses and couplings.

Topa’s sales team is available online 24/7 to help you select the right hydraulic fittings for your application.

Topa is not just a supplier, it is your partner for success. With their extensive product range, quality control and excellent customer service, they offer a one-stop solution for all your hydraulic needs. So the next time you’re in the market for hydraulic hoses and fittings, remember that Topa offers both quality products and peace of mind. For more help or advice, please feel free to contact us.


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