New hydraulic hose assembly with crimped fittings next to a caliper and thread pitch gauge on a workbench

A hose failure doesn't leave much time for research. Equipment is down, fluid is on the ground, and the priority is getting a correct replacement built fast, not just any hose that looks close enough.

This guide walks through how to replace a hydraulic hose from start to finish: identifying the fitting on your failed assembly, selecting the right hose using the STAMP method, matching crimp specs correctly, and protecting the new assembly so it doesn't fail again.

If you'd rather skip the process entirely, Hydraulic Supply Company builds custom hose assemblies at more than 40 branch locations, and dispatches mobile service when the equipment can't come to us.

Start With the Fitting You Already Have

Before ordering a replacement hose, look closely at the failed assembly, sometimes called the hose assembly on a parts list or work order. Two things matter most: where the failure happened, at the fitting, at the crimp, or along the hose body, and what thread type is on each end.

Fitting identification off a damaged assembly can be difficult, especially if the failure point is the fitting itself. Measure what's left with a thread pitch gauge and caliper, or send us a photo and our specialists will identify it for you. For a full breakdown of thread types including JIC, NPT, NPTF, ORFS, ORB, BSPP, and metric, see our Hydraulic Fittings guide.

Safety warning: Never check a pressurized hydraulic line for a leak with your bare hand. A pinhole leak can inject fluid into the skin at pressures far beyond what tissue can withstand, and the entry wound often looks minor even when the injury underneath is severe. Use a piece of cardboard or wood to check for leaks instead, and treat any suspected high-pressure fluid injection as a medical emergency, regardless of how the wound appears.

Selecting a Replacement Hose: The STAMP Method

STAMP is the standard framework fluid power professionals use to select the correct hose. Working through all five factors, rather than just matching size, is what prevents a replacement from failing again under the same conditions that took out the original.

Size

Size refers to the hose's inside diameter, measured in dash sizes, where each increment equals 1/16 inch. Match the original hose's dash size unless you have a specific reason to upsize for improved flow or downsize for a tighter routing path.

Temperature

Two temperature ranges matter: the temperature of the fluid running through the hose, and the ambient temperature the hose is exposed to externally. A hose routed near an engine or exhaust manifold needs to tolerate ambient heat well above the fluid's own operating temperature.

Application

Application covers how and where the hose is routed, including minimum bend radius, whether the installation is static or subject to constant flexing, and exposure to abrasion from nearby components or rough surfaces. Undersized bend radius is one of the most common causes of premature hose failure. This matters just as much replacing a hydraulic hose on a tractor loader arm as it does on a stationary press.

Media

Media is the fluid the hose will carry, petroleum-based hydraulic oil, water-glycol, phosphate ester fire-resistant fluid, or others. Using a hose not rated for the specific fluid type leads to internal degradation, even if the size and pressure rating are otherwise correct.

Pressure

Pressure covers both the maximum working pressure the hose must handle and its burst rating, which typically carries a 4:1 safety factor over working pressure. Check your equipment's documentation or the layline printed on the original hose to confirm the rated working pressure before ordering.

Once you know your spec, browse Hydraulic Hose by type, or explore Marine Hose and Special Application Hose for non-standard environments.

Matching Crimp Specs to Your Hose and Fitting

Crimp specifications are not universal. The correct crimp diameter depends on the specific combination of hose, fitting, and manufacturer, and using a generic or approximate crimp spec can result in a fitting that looks properly attached but leaks or blows off under pressure.

If you're crimping in-house, confirm the exact spec from the hose and fitting manufacturer's published crimp charts before running the machine. Browse Assembly Equipment for crimpers and related tools, or explore Hose Fittings and Tube Fittings to confirm you have the correct fitting for your hose before crimping.

Hose Protection and Clamps

A correctly selected and crimped assembly can still fail early without proper protection. Abrasion sleeves and spring guards prevent wear at contact points and tight bends, while correctly spaced clamps reduce vibration fatigue along the length of the run, one of the most common root causes behind hoses that fail again shortly after replacement.

Browse Hose Protection and Hose Clamps & Crimp Ferrules to prevent a repeat failure.

Do It Yourself, or Let HSC Handle Onsite Hydraulic Hose Repair

Order Online Have your spec and just need the parts? Shop Hydraulic Hose and Hose Fittings directly.

Visit a Branch Skip the DIY process entirely. Hydraulic Supply Company builds while-you-wait hose assemblies at more than 40 branch locations, using Danfoss Aeroquip, Eaton, SSP, Kuriyama, and other manufacturer specs. Find a Branch

Onsite / Mobile Service If the equipment can't be moved, HSC dispatches mobile technicians carrying hose stock, fittings, and crimping equipment directly to your job site for onsite hydraulic hose repair, 24/7 including weekends and holidays. Schedule Mobile Service

Managing hose replacement across a fleet or standardizing assemblies for recurring builds? See our Hose & Components Kitting service.

Verify the Installation

A correctly built assembly can still fail if it's not verified after install. Before returning equipment to full operation, bring the system up to low pressure first and check every connection for leaks before moving to full operating pressure. Once the machine is running, check the hose routing again under actual movement and load, since a bend radius that looked fine at rest can pinch or rub once the machine is in motion.

If you're using reusable fittings, confirm proper torque specifically. Over-tightening a reusable fitting can cut or pinch the o-ring rather than seal it, causing a leak that only appears once the system is under pressure.

Hose Brands We Carry

Aeroquip: Hydraulic Supply Company is a certified Danfoss Aeroquip Hose Center, and Aeroquip is our primary line for hose and matched fitting systems. Shop Aeroquip

Gates: A broad line of hydraulic and industrial hose built for demanding mobile and industrial applications. Shop Gates

Frequently Asked Questions

What's the difference between wire braid and spiral hose?

Wire braid hose uses one or two layers of braided reinforcement and offers a tighter bend radius, making it a common choice for lower and medium pressure applications. Spiral hose uses four to six layers of spiral-wound wire, handles higher pressure, and is more rugged, but requires a larger minimum bend radius.

Can I reuse the fittings from my old hose assembly?

Generally, no. Crimped fittings and ferrules are permanently deformed during the crimping process and are not designed for reuse. Reusable-style fittings are the exception, and can be removed and reinstalled without a crimping machine.

How do I know what pressure rating I need?

Check your equipment's documentation for the system's rated working pressure, or read the layline printed along the original hose, which typically lists the working pressure. The replacement hose should meet or exceed that rating.

How do I replace a hydraulic hose on a tractor?

The process is the same as any other assembly: identify the fitting, select the replacement using STAMP, and match the crimp spec, but pay extra attention to bend radius and abrasion protection on loader arms and other points that flex under load. If the equipment can't be trailered in, HSC's mobile service can build and install the assembly on-site.

Do you offer same-day hose assembly?

Yes. Most branch locations build while-you-wait hose assemblies using in-house crimping equipment. Contact your nearest branch to confirm availability for your specific hose and fitting combination.

What if my equipment can't be brought to a branch?

Hydraulic Supply Company offers onsite hydraulic hose repair, with mobile technicians who carry hose stock, common fittings, and crimping equipment to fabricate and replace failed assemblies at your location, available 24/7 including weekends and holidays.

Need it built fast? Find a Branch near you for while-you-wait hose assembly.

Equipment down and can't be moved? Schedule Mobile Service for 24/7 onsite hose repair and replacement.