A hydraulic connection only holds if the fitting type, thread, and sealing surface all match. We identify JIC, ORFS, ORB, NPT, and metric fittings and replace them correctly — so it stops leaking and stays that way.
A surprising share of hydraulic leaks aren't the hose at all — they're the connection. Hydraulic fittings seal in fundamentally different ways, and they are not interchangeable even when they thread together. A JIC fitting seals metal-to-metal on a 37-degree cone. An ORFS (o-ring face seal) seals on a flat face against an o-ring — the go-to for high pressure and vibration. An SAE ORB (o-ring boss) seals with an o-ring down in a straight-thread port. NPT tapered pipe thread seals on the threads themselves. And metric fittings add their own cone and face-seal variants on top.
The trouble starts when these get mixed — which happens constantly on equipment that's been repaired by whoever was closest to the breakdown. A straight-thread fitting forced into a tapered port, a JIC cranked down to stop a weep until the cone cracks, an o-ring left out or pinched. Once you understand that each style has a specific sealing surface, the leaks make sense: the surfaces aren't meeting the way they were designed to. More torque doesn't fix a mismatch; it usually makes it worse.
Our job is to read what's actually there, identify the correct fitting and sealing method for each port, and replace or adapt so every connection seals on its proper surface. On mixed equipment that often means the correct adapter to bridge two standards cleanly, rather than a forced connection that will weep again in a week.
A connection that won't stop leaking is telling you something. These are the usual fitting-related causes.
It weeps no matter how tight you make it. A leak that survives tightening — or gets worse — almost always means the fitting styles or sealing surfaces don't match. The answer is the correct fitting, not more torque.
A previous repair "made it fit." Forced connections between mismatched standards are a common field fix that comes back. If a joint was adapted with whatever was on hand, it's worth correcting properly.
A cracked flare or pinched o-ring. Over-tightened JIC cones crack; o-rings get pinched or left out. A damaged sealing surface will always leak until the fitting is replaced.
Fitting and adapter work is part of our complete mobile hydraulic repair across Fresno County, whatever your equipment needs.
We'll identify the fitting, the port, and the sealing surface and put the right connection on it.
📞 Call (559) 206-3899Tell us the machine, what failed, and the best number to reach you. We'll get back to you to help figure out the problem and next steps — no obligation.
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