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Hydraulic Hose Assemblies
Hydraulic hose assemblies to 6,000 psi
High pressure lines are where hose choice stops being about diameter. Reinforcement, bend radius and pressure class decide whether an assembly lasts a season or a week. We stock and crimp from 1/8 inch through 2 inch at two counters on Long Island, and most assemblies are finished while you wait.
Construction
Braid or spiral, and why it matters
Every hydraulic hose is a rubber tube wrapped in steel and covered. What changes between grades is how that steel is arranged, and that single decision sets the pressure the assembly will hold and how it behaves in a moving application.
Braided hose has wire woven in a criss-cross pattern around the tube. One braid handles lower pressure work, two braids handle most general hydraulics, and the construction stays relatively flexible, which is why braid is the usual answer on tighter routing and on lines that flex with a boom or a cylinder.
Spiral hose wraps the wire in alternating layers laid at opposing angles instead of weaving it. Four or six spirals carry far more pressure and, more importantly, survive pressure spikes and impulse cycling much better. The tradeoff is stiffness. Spiral hose does not like a tight bend, and forcing one is a reliable way to fail an expensive assembly early.
Working pressure is what the assembly is rated to run at every day. Burst pressure is where it fails, and hydraulic hose is designed with a four to one margin between them. That margin exists to absorb spikes, not to be spent, which is why running a hose above its rated working pressure because it has not burst yet is a bad plan.
Match The Machine
What your equipment usually needs
Pick the machine you are working on. These are the patterns we see across the counter, not a substitute for the plate on your equipment. Bring the old assembly and we will confirm it.
Excavators and loaders
Boom, arm, bucket and swing circuits all flex constantly and sit exposed to abrasion. Main circuit lines usually call for spiral construction because of impulse cycling, while auxiliary and pilot lines are commonly braid. Newer machines increasingly run ORFS ends, older ones JIC, and mixed fleets end up with both.
Vacuum and sewer trucks
These run hard, run long days and cannot sit idle. The hydraulic side drives the boom, the tank hoist and the reel, and it lives alongside heat from the engine and the pump. Heat shortens hose life faster than pressure does, so cover selection and routing away from exhaust matter as much as the pressure class.
Lifts and aerial platforms
Scissor lifts, boom lifts and tail lifts run lines that extend, retract and flex through their full travel. Bend radius is the constraint here more than raw pressure, because a line that gets pinched at full extension will fail regardless of its rating. Flexibility usually wins over the highest pressure class.
Shop presses and balers
Static installations with short lines and high pressure. Nothing moves much, so flexibility hardly matters and pressure class is the whole conversation. These are the assemblies most likely to need spiral construction at the top of the range, and the ones where a mismatched fitting shows up fastest.
Log splitters and small gear
Lower pressure, simpler circuits, and usually the machine somebody wants running again this afternoon. One or two wire braid covers most of it, and the assembly is often short enough that we can measure and build it in minutes. Common walk-in work, especially through the autumn.
Hydraulic steering
Outboards and inboards along the south shore, usually handled out of the Oakdale counter. Pressure is modest but the environment is not, so corrosion resistance at the fittings matters more than the pressure class. Stainless ends are a few dollars more and worth it on a boat.
Why They Fail
Six reasons a hydraulic hose gives up early
Almost none of these are the hose being defective. They are decisions made when the assembly was built or installed, which means they are avoidable next time.
Abrasion
A line resting against steel wears through the cover, then the reinforcement, then it lets go. Usually visible long before it fails. Sleeving costs very little compared to the downtime.
Bend radius
Every hose has a minimum bend it tolerates. Routed tighter than that, particularly right at the fitting, the reinforcement fatigues. Elbow ends solve it properly where a tight turn is unavoidable.
Heat
Proximity to an engine, a pump or an exhaust ages the cover and the tube faster than pressure ever will. Routing and heat sleeving matter as much as the pressure rating on these runs.
Pressure spikes
A system that reads fine on the gauge can spike hard on valve closure. Spikes are what the four to one design margin is there to absorb, and what spiral construction handles far better than braid.
Wrong fitting seat
A JIC end on an SAE 45 fitting tightens and then weeps. Tightening harder makes it worse. This is a build decision, and it is covered on the custom hose assembly page.
Twist on installation
A hose installed with a twist in it loses a significant share of its life. Clocking the ends correctly at build time removes the need to twist it into place at all.
At The Counter
Built, crimped and tested here
Over 100,000 feet on the shelf
Depth is what makes a same-visit assembly possible. Braid and spiral across the full size range, plus tens of thousands of fittings including JIC, NPT, ORFS, metric and flange ends, so the combination you need is almost always already here.
Bulk hose by the foot is available too, through hydraulic hoses and hydraulic fittings and adapters.
Crimped on calibrated equipment
The crimp is matched to the fitting manufacturer and the hose, not set by eye. That is the difference between an assembly that holds at rated pressure and one that pushes a fitting off under load. Every assembly is checked before it leaves.
If you have the hose and only need it terminated, that is hydraulic hose crimping. If a machine is down right now, emergency hose repair covers it.
Before You Come In
Common questions
The working pressure is usually printed on the layline along the hose, though on an old assembly it is often worn off. When it is gone, the machine and the circuit tell us enough. Bring the old hose in, tell us what it came off, and we will match or improve on it rather than guess downward.
Working pressure is what the assembly is built to run at continuously. Burst is where it fails. Hydraulic hose is designed with a four to one margin between the two, and that margin exists to absorb pressure spikes rather than to be used as headroom. An assembly run above its working pressure is consuming its safety factor.
Usually yes on pressure, but not always on fit. Moving from braid to spiral raises the rating and also raises the stiffness and the minimum bend radius, so a spiral hose in a tight routing can fail sooner than the braid it replaced. We will tell you when the upgrade helps and when it causes a new problem.
Yes, up to 6,000 psi, alongside one and two wire braid and four spiral. The full range runs from 1/8 inch through 2 inch, all stocked and crimped in house at both shops rather than ordered in.
If they were installed at the same time and ran the same duty, replace both. They have aged together, seen the same heat and the same cycles, and the second one is usually not far behind. On a machine that costs money every hour it sits, doing it once is cheaper than doing it twice.
Yes, and for equipment that cannot afford downtime it is the right approach. Once an assembly has been built here the specification stays on file, so a spare set can be made up ahead of time and sat on the shelf. For larger operations we also hold dedicated inventory of critical parts. Ask at either counter or through the contact page.
Get It Built
Bring the failed line in
The old assembly tells us the pressure class, the ends and the length in about a minute. Walk into either counter with it, or send the machine details and a photo and we will come back with what we would build.