The K3V112DT on a Kobelco SK200-8 rarely fails all at once. It fades — a little slower to build pressure in the morning, a little noisier under swing combined with travel, a little more metal on the magnet of the return filter. When that fade begins, every owner faces the same decision: rebuild the pump with internal parts, or replace the whole assembly. This guide walks through that decision the way the technical team at Guangzhou Shenyue Machinery Technology Co., Ltd. walks through it with customers — by the numbers, not by the mood of the day.
Verified numbers first: the three quotations everyone should know
Three numbers cover the majority of K3V112DT pump business on the SK200-8, and all three are verified against live stock records:
| Part | Primary number | Also quoted as |
|---|---|---|
| K3V112DT pump assembly (complete) | 2924610-0030 | YN10V00005S156 |
| Set plate (valve plate, cylinder-block side) | 2924110-0056 | LC10V00010S153 |
| Regulator assembly (power control) | 29070821-4927 | YN10V01006F2 |
Note the pairing: most of these parts carry two references depending on the channel that quotes them — a 7-digit-style number and a YN/LC-style number. They describe the same part, so a quotation that shows both is normal, and a quotation that refuses to show either is a warning sign.
Rebuild or replace? The honest decision tree
A complete assembly (2924610-0030 / YN10V00005S156) makes sense when the rotating group is heavily scored, when the housing or drive spline is damaged, or when the machine is earning money on a contract where two days of downtime cost more than the difference in price. The pump comes off, the new assembly goes on, and the old core becomes a rebuild project for a quiet week.
A rebuild makes sense when the damage is localised. In practice, three internal conditions decide the outcome:
- Set plate wear (2924110-0056 / LC10V00010S153). The set plate is the classic wear interface of the K3V112DT: it seals the cylinder block against the valve surface, and scoring or uneven wear here shows up first as slow response and hot pump case drain. Replacing the set plate — and inspecting the block face it runs against — is the most common single-item repair on this pump.
- Regulator trouble (29070821-4927 / YN10V01006F2). If the machine's power mode has stopped behaving — sluggish on the pressure line, over-sinking at high flow, or slow to shift between modes — the fault is often in the regulator, not in the rotating group at all. A regulator assembly is a fraction of the cost of a pump, and diagnosing it first is the cheapest test in the whole exercise.
- Pistons, cylinder block, shoe plate and retainer. These internal parts are commonly quoted for the K3V112DT across the industry, but the correct specification for your pump depends on the build details of the unit itself — the pump nameplate is the authority. If the rotating group is worn to the point that pistons and block need replacement, price the complete assembly before committing: the arithmetic often favours the assembly.
What the rebuild should always include
A K3V112DT rebuild done properly is more than the worn item. At minimum, the following get checked or replaced together: the set plate and cylinder-block interface, the shoe plate and piston retainer, the ball guide and drive shaft bearings, and every seal and O-ring in the pump body. Reusing a scored set plate against a freshly lapped block, or a new set of seals behind a worn bearing, is how a "rebuilt" pump returns in five hundred hours. Buyers who rebuild once and rebuild correctly never call us twice for the same pump.
Where the mistakes happen
The most expensive K3V112DT ordering errors we see are not exotic: they are quotation lines that name the right pump but the wrong level of part — a set plate number used to sell a full valve-plate kit, an assembly number quoted for a bare housing, or a regulator sold when the machine needed a solenoid. Every quotation from Guangzhou Shenyue Machinery Technology Co., Ltd. states the grade of each item — genuine, OEM or aftermarket — and what the part physically is. Shenyue is an independent supplier and is not an authorized dealer or distributor of Kobelco Construction Machinery Co., Ltd.; genuine Kobelco parts are supplied through original supply channels alongside quality replacement alternatives, at prices close to agent level.
Buyers sourcing several makes alongside Kobelco can use our export brand site corbayparts.com for the same rebuild discipline applied across brands. Pump side-by-side comparisons live on the hydraulic components page, and a number can be checked directly in the part number search. For the servicing routine that keeps a healthy K3V112DT healthy, read our hydraulic pump maintenance guide, and for the family context see K3V112 vs K5V140 pump families — remember that the K5V140 belongs to the SK330-8 / SK350-8 class, not the SK200-8. Official part documentation from Kobelco's official site remains the reference for original data.
Frequently Asked Questions
What part number is the K3V112DT pump assembly on a Kobelco SK200-8?
The complete K3V112DT pump assembly is quoted under 2924610-0030, also referenced as YN10V00005S156. Guangzhou Shenyue Machinery Technology Co., Ltd. verifies both references against the pump nameplate photograph before quoting, and states on every quotation whether the item is genuine, OEM or aftermarket.
When should I rebuild a K3V112DT instead of buying a complete assembly?
Rebuild when the damage is localised — for example set plate wear (2924110-0056 / LC10V00010S153) or a faulty regulator (29070821-4927 / YN10V01006F2). Buy the complete assembly (2924610-0030) when the rotating group or housing is heavily damaged, or when downtime on contract work costs more than the price difference.
What does the set plate do on a K3V112DT pump?
The set plate seals the cylinder block against the valve surface of the pump. Wear or scoring on the set plate shows up as slow hydraulic response, heat and metal particles in the case-drain filter. The verified replacement reference for the SK200-8 application is 2924110-0056, also quoted as LC10V00010S153.
Can I order K3V112DT pistons and cylinder block by model name alone?
No. Internal parts such as pistons and the cylinder block are commonly quoted for the K3V112DT, but the correct specification depends on the build of your pump. Send the pump nameplate and the machine serial number, and Guangzhou Shenyue Machinery Technology Co., Ltd. will confirm each item before quotation.