When a main pump, a travel motor or a swing motor fails, the fastest route back to work is usually not a new unit from a factory line and not a full workshop rebuild. It is an exchange: a prepared unit goes out, the failed unit comes back as a core, and the price depends on what the core turns out to be. That last part is where buyers get caught, because the transaction only works if the old unit's condition was recorded before removal. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes these units constantly, so here is how the process should run.
What an exchange quotation actually contains
A hydraulic quotation for a major assembly should name four things: the assembly number, the grade of the unit being supplied, what is expected of the core, and what happens if the core does not meet that expectation. Grade matters most, so understand what each label means. A genuine unit is a manufacturer's part. An OEM unit is made by the original manufacturer for the same duty. An aftermarket unit is a quality replacement built to fit and work as the original does. A remanufactured unit is a used assembly put back to specification. Which of these you receive is a purchasing decision, not a detail, and it must be declared on the quotation rather than discovered on arrival.
Assembly numbers our records quote
| Assembly | Numbers quoted in our records |
|---|---|
| Hydraulic pump assembly | 2924610-0030 / YN10V00005S156 |
| Hydraulic pump assembly | 30C40-111 / YN35V00018F2 / YB35V00003F1 |
| Hydraulic pump assembly | 30C12A-111 / YN35V00004F2 |
| Regulator assembly | 29070821-4927 / YN10V01006F2 |
| Regulator assembly | YN10V01006F1; YN10V01009F4 / GYT6K |
| Travel motor assembly | GM85VA / LS15V00020F1 |
| Swing motor assembly | YN15V00077F1 / YN15V00055F1 / YN15V00035F1 |
| Swing motor assembly | XZ0531E / YN32W01081P1; LC15V00022F1 / M5X180 |
| Swing reduction assembly | YN32W00025F1 / YN32W00022F2 / YN32W00019F1 |
| Reduction assembly | AE3994A / AP3994B / YN32W01060P1 |
Where a line carries several numbers, that is one assembly and one set of markings rather than a choice of alternatives. Note too that the pump assemblies above sit on different machine classes; the 30C prefix is not the same family as the 2924610 group, and a regulator is not interchangeable between them.
What to record before the core comes out
| Record | Why it decides the price |
|---|---|
| Assembly plate photograph | Fixes the number, including running changes inside a series |
| Machine serial and hours | Shows whether the failure is age or a system fault |
| Oil condition and any metal found | Distinguishes a worn unit from a contaminated system |
| Damage to shaft, spline and mounting faces | Determines whether the core is rebuildable at all |
| Whether the unit was run after the fault | A pump run dry or a motor run with debris often is not |
None of this is paperwork for its own sake. A travel motor that failed because the oil was full of debris from a collapsed bearing looks identical on the bench to one that simply wore out, and the difference decides whether the replacement is a fresh unit or a rebuilt one. Photographs taken before removal settle the question in one message.
Why the core matters as much as the unit
An exchange only makes sense if the core can be reused, so the buyer's job is to protect its recoverability. Keep the unit complete: fittings, covers and the sensor if it has one are all part of the assembly, and a unit returned missing its fittings is worth less. Drain it and plug the ports rather than leaving it open to the air, because a corroded bore is a rejected core. And do not let the failed unit be run again to prove a point; a second start after a failure is the fastest way to turn a rebuildable core into scrap.
The same discipline applies when the failure is a system problem rather than a component problem. If a pump has failed twice on the same machine, the answer is usually in the hydraulic oil, the filtration or the regulator, and our guides to the genuine, OEM, aftermarket and remanufactured grades and to the hydraulic components range cover both sides. Where an assembly has a superseded number, the part number search resolves it against the current line. International buyers ordering exchange units alongside other work will find the same grades described on our export catalogue site, corbayparts.com.
Writing the enquiry so it can be quoted
Send five things: the assembly number from the plate, the machine model and serial, the hours, what the machine was doing when it failed, and whether you want a new, OEM, aftermarket or remanufactured unit. With those five, Guangzhou Shenyue Machinery Technology Co., Ltd. can quote the unit, state the core expectation and give a lead time in one reply rather than three. Assembly information for the machine side is published by Kobelco Construction Machinery, and the fastest route to a price on your unit is a plate photograph sent through contact.
Frequently Asked Questions
What does core return mean on an exchange unit?
It means the failed assembly goes back to the supplier, and its condition affects the price. Keep the unit complete with its fittings, drain it, plug the ports against corrosion, and never run it again after a failure — a second start can turn a rebuildable core into scrap.
What is the difference between genuine, OEM, aftermarket and remanufactured?
A genuine unit is a manufacturer's part, an OEM unit is made by the original manufacturer for the same duty, an aftermarket unit is a quality replacement built to the same fit and function, and a remanufactured unit is a used assembly restored to specification. Which one you receive is a purchasing decision and is declared on the quotation.
Which pump assembly does my machine take?
Read it off the pump plate rather than the model badge. Our records quote pump assemblies as 2924610-0030 / YN10V00005S156, 30C40-111 / YN35V00018F2 / YB35V00003F1 and 30C12A-111 / YN35V00004F2, with regulator assemblies as 29070821-4927 / YN10V01006F2 and YN10V01009F4 / GYT6K. These belong to different machine classes.
How quickly can Shenyue quote an exchange unit?
Send the assembly number, machine serial, hours, the failure symptom and the grade you want. Guangzhou Shenyue Machinery Technology Co., Ltd. has supplied Kobelco parts since 2007, holds 3,000+ part types on the shelf with 100,000+ part numbers available to order, and returns the unit price, core expectation and lead time together.