A hydraulic hose assembly is identified by four things: the hose itself, its two end fittings, the length measured under load, and any protective sleeve or routing requirement. The hose carries a layline printed along its length giving the construction code and the working pressure, and the size appears as a dash number, which is the inside diameter in sixteenths of an inch. Fittings are identified by thread and seat type, by angle, and by whether they are crimped or reusable. Photograph the layline, both fittings and the serial number plate, and the assembly can be built correctly the first time.
What the layline and the fittings actually tell you
| Marking | What it identifies |
|---|---|
| Layline construction code | Reinforcement type and working pressure. The starting point for any substitution. |
| Dash size | Inside diameter in sixteenths of an inch. Dash 12 is three quarters of an inch. |
| Fitting seat and thread | How the fitting seals and what it screws onto. Flare, flat face O-ring, cone and flange are not interchangeable. |
| Elbow angle and orientation | How the assembly routes. Get this wrong and the hose is stressed from its first day. |
| Guard or sleeving | Protection against abrasion and heat, and part of the original specification. |
How to confirm it
- Read the layline on the hose
The printed line gives the maker, the construction code and the working pressure. A code such as 4SP, 4SH or R12 describes the reinforcement layer, and the pressure rating follows from it. Photograph the whole line in one frame rather than in pieces.
- Measure the dash size and the length
The dash number is the inside diameter in sixteenths of an inch, so a dash 12 hose is three quarters of an inch inside. Measure between the sealing faces of the two fittings, not the cut length of hose, and state where the assembly sits on the machine.
- Identify each fitting by type, thread and angle
Look at the seat: a 37 degree flare, a flat face with an O-ring, a cone seat or a flange. Then record the thread, the elbow angle and whether the fitting swivels. The two ends of one hose are often different, so identify them separately.
- Note the protection, the heat and the routing
Sleeving, spiral guard and any abrasion marks all belong in the inquiry. Heat, movement and rubbing decide how long the replacement will live, and a hose that failed young usually failed for a reason worth fixing at the same time.
- Send everything together with the machine identity
Layline photographs, both fitting ends, the measured length and the serial number plate take two minutes to collect and remove nearly all risk of a wrong assembly. Guangzhou Shenyue Machinery Technology Co., Ltd. builds assemblies with genuine and OEM-quality hose and fittings and quotes the grade for each line, so the buyer knows exactly what is being supplied.
- Record the assembly numbers for next time
Once the numbers are confirmed, write them into the machine's parts list, and the next replacement takes one line of text instead of another set of photographs. Guangzhou Shenyue Machinery Technology Co., Ltd. keeps these records per serial number so repeat orders match the first one exactly.
What to do about it
Match the construction, not just the size. A hose of the right diameter with the wrong pressure rating fails young and dangerously.
Match both fittings individually, including the angle and the swivel, before the assembly is crimped.
Replace the protective sleeving at the same time. It was on the original assembly for a reason.
Order by the numbers you recorded and keep them on file. Guangzhou Shenyue Machinery Technology Co., Ltd. supplies genuine, OEM-quality and remanufactured hose and fitting lines from Guangzhou, holds 3,000+ part types on the shelf with 100,000+ part numbers available to order, and declares the grade on every quotation line. The five brands for which the company holds authorized dealer status are Garrett, Mitsubishi Heavy Industries, TONGMYUNG, NIKURA and Marusan, and the Mitsubishi authorization covers MHI engine parts only. Kobelco is not among them, and Kobelco parts are supplied through original channels or as quality alternatives.
Parts you may need, by grade
| Part | Grades commonly quoted |
|---|---|
| Hose assemblies | Genuine; OEM-quality. Built to the recorded dash size and rating. |
| Crimp fittings | Genuine; OEM-quality. Seat and thread matched individually. |
| Reusable fittings | OEM-quality. Field-repairable where routing allows. |
| Sleeving and guards | Genuine; OEM-quality. Matched to the original spec. |
Need the parts this covers?
Send the machine model, serial number and the part numbers you need. We confirm fitment before payment and state the grade of every line — genuine, OEM-quality or aftermarket.
Request a quoteFrequently asked
Can I identify a hose by its diameter alone?
No. Diameter is one of four things that matter. Pressure rating, both fitting ends and the length all have to match, and the right size with the wrong rating is a safety problem rather than a saving.
Are hose part numbers universal across makes?
Sometimes, but not reliably. Manufacturers use their own numbering, and the same physical assembly can carry different numbers on two machines. That is why the layline and the fitting photographs matter more than any single number.
What should I send to get an assembly built correctly?
Layline photographs, both fitting ends, the measured length, the routing position and the machine serial number. Send them together on one sheet and a quotation can be built against them without a second round of questions.