Description

Doosan DX225LC, DX300LC, DX340LC, DX255LC 2007 Technical Manual – KVMG 270 Control Valve

I’ve torqued more head bolts than most of you have had hot meals. And I’ve seen aftermarket manuals that look like someone wiped their hands on napkins and called it a diagram. Doosan DX225LC, DX300LC, DX340LC, DX255LC 2007 Technical Manual is the real thing – 39 pages of OEM documentation direct from Doosan Infracore, published January 18, 2007. It covers exactly one thing: the KVMG 270 control valve. That’s it. And that’s what makes it valuable. No fluff, no reprints – just the factory print that tells you how the hydraulic heart of your excavator is supposed to work.

Control Valve of DX Excavator – What You Get with 39 Pages

This Technical Manual is not a full machine service manual. It’s a deep dive on the valve assembly. Page 1 gives you the document number (DXT CVKG 0508 Rev 01) and the applied models: DX225LC, DX255LC, DX300LC, DX340LC. Page 2 repeats the list. Then on page 3 you get a simple drawing showing ARM 1, ARM 2, BOOM 1, BOOM 2, BUCKET, SWING, TRAVEL (L/R), OPTION ports, and the P1/P2 pump lines. Page 4 is a cutaway drawing with foot relief valves labeled. Page 5 lists 14 specific components inside that valve stack: check valves, swing priority valve, arm regeneration valve, boom priority valves x2, orifice check valve for travel, foot relief (nega-con) valves, and more. No guesswork – it’s all laid out.

KVMG 270 Control Valve – Why the OEM Specs Matter

That valve stack controls every movement your machine makes. Aftermarket reprints often swap or omit the orifice sizes for the SP valve or miss the boom priority check-valve arrangement. With this factory document, you see the exact hydraulic circuit – how P1 feeds ARm 2, BOOM 1, BUCKET, and how P2 feeds TRAVEL, SWING, OPTION. You get the port IDs (pa8, ps1, ps2, pi4, etc.) and the internal passages. If you’re rebuilding a KVMG 270 or just diagnosing a sluggish swing or weak boom, the schematic on page 3 and the component list on page 5 are your starting point. I’ve seen techs lose half a day because they used a third‑party drawing that had the boom priority valve swapped left to right. Don’t be that guy.

Does This Manual Cover the Entire Machine?

No. This is not a workshop manual for the engine, undercarriage, or electrical system. It’s a Technical Manual focused solely on the KVMG 270 control valve. If you need engine torque specs or transmission procedures, look at the related workshop manuals: DOOSAN DX225LC 2006 Workshop Manual, DOOSAN DX225LC 2008 Workshop Manual, or DOOSAN DX300LC 2008 Shop Manual. But if your problem is in the valve stack – spools sticking, relief pressures off, regeneration not working – this is the document you want.

7 Key Components Detailed in the KVMG 270 Section

Page 5 breaks down the valve assembly into 14 numbered items. Here are the ones you need to know:

• Check valves (items 1–3) – prevent backflow in the spool circuits.
• Swing priority (S/P) valve (item 4) – gives swing circuit priority when the arm is not moving.
• Arm regeneration valve (item 7) – recirculates oil for faster arm‑in speed.
• Boom priority valve x2 (item 9) – ensures boom gets enough flow when combining with other functions.
• Foot relief (Nega‑con) valves (item 14) – control the negative‑flow signal for pump regulation.

Source Validity – Factory Print, Not a Reprint

This is an original OEM document from Doosan Infracore’s Overseas P/S Team. The OCR shows “Docu. No : DXT CVKG 0508 – Rev 01” and a date stamp. No third‑party conversion, no scanned copy of a copy. The data came straight from the manufacturer’s engineering files. Compare that to an aftermarket manual where you don’t know if someone changed a relief setting because “it looked close enough.” I trust factory paper. You should too.

FAQ

Is this manual for the DX225LC only?

No. It covers four models: DX225LC, DX255LC, DX300LC, and DX340LC. All use the same KVMG 270 control valve – that’s why it’s one document.

Does it include wiring diagrams?

No. This manual is strictly about the hydraulic control valve. No electrical schematics, no engine data.

What language is the manual in?

English. Written by Doosan’s overseas team.

Can I use this for a 2008 model excavator?

The manual is dated 2007. Later model years may have valve revisions. Check your machine’s serial number and compare the valve part numbers. For 2008–specific data, see DOOSAN DX300LC 2008 Shop Manual or the 2008 DX225LC manual if you need updated info.

If you’re working on a Manual Transmission rebuild in a truck, you’d never use a generic spec chart – you’d get the factory manual. Same principle here. The KVMG 270 is a precision hydraulic valve. Use the OEM technical manual to get the port sizes, spring settings, and relief valve placements right. Manual Transmission repairs are straightforward when you have the factory synchro clearances; hydraulic valve work is no different. Manual Transmission experts rely on factory data. Do the same for your Doosan excavator.

Exactly 39 pages. No filler. No copy‑paste errors. Access the Factory Manual and start diagnosing the right way.