Korean excavator hydraulic fittings defeat the habit of learning one convention per manufacturer. Korean excavators and loaders are everywhere in the fleets we supply, and they are the machine that most often defeats the habit of learning one convention per manufacturer. The useful mental model is not "this brand uses that thread"; it is that these machines were designed in a region where two conventions are both normal, and either may appear.
Why one machine can carry two families.
Hydraulic components on a large machine come from many suppliers. A pump, a travel motor, a control valve and a cylinder may each arrive at the assembly line with the port convention their own maker uses, and the machine is plumbed to suit rather than converted to a single standard. The result is a machine that is genuinely mixed from new, before any repair has touched it.
What a second-hand import adds to that.
A used machine also carries its repair history. Every hose replaced in its previous life was made up from what that workshop stocked, which is why an imported machine often has an adapter stack at one end of a hose and a different family at the other. None of that is wrong — it was the right decision at the time — but it means the machine in front of you is not the machine in the manual.
When you re-hose such a machine, it is worth taking the opportunity to simplify: replace an adapter stack with a single hose end in the right family, and write down what you did. The next repair is then a phone call rather than an investigation.
The two gauges that end the guessing.
| Tool | Answers |
|---|---|
| Seat angle gauge | 24°, 30°, 37° or flat face — the family |
| Thread pitch gauge | Metric pitch or threads per inch — the thread |
| Caliper | Diameter across the crests — the size |
| A phone camera | Everything else, when you send it to us |
Metric adapters
Metric ends, studs and bridging parts.
Is there a single thread standard for Korean machines?
No, and treating it as though there were is the mistake. Expect metric and 30° flare families, identify each line rather than the machine, and keep bridging adapters for the two conventions your fleet actually mixes.
My machine has different ends on the same hose. Is that a fault?
Not necessarily — many hoses are built that way from new, because the two components they join use different conventions. It only becomes a problem when a stack of adapters has grown at one end, which adds leak paths and moves the hose out of its intended position.
Re-hosing a mixed machine?
Photograph both ends of each hose you are replacing, with the thread measured. We will name the parts, and where a stack of adapters can become one correct end, we will say so.
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