Yanmar YDP20N – specifications
Series: YDP Series
Build year not documented · Data origin: Manufacturer information · sources
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The Yanmar YDP20N is an industrial engine from the YDP series. The fuel is diesel.
The pumps of the YDP Series are portable diesel water pumps with a 13 l tank for irrigation and dewatering of farmland and construction sites. According to Yanmar the YDP20N has an air-cooled four-stroke diesel of 219 cm³ displacement with a maximum of 3.5 kW at 3,600 rpm; the recoil-start version weighs 44 kg.
The YDP20N delivers up to 550 l/min through suction and discharge connections of 50 mm each and reaches a head of 32 m. Dry weight is 44 kg and the dimensions are 530 x 637 x 484. The head tells how high the pump can push water, the connection diameter how much dirt and solids can pass through the hoses.
Yanmar YDP series – engine-driven centrifugal pumps in frame sizes 20, 30 and 40 from US EPA certification, in 24 versions for irrigation and construction-site dewatering
The YDP series is a frame-size family of engine-driven centrifugal pumps from the Japanese maker Yanmar, founded in 1912 in Osaka, which established the industrial small-diesel technology in 1933 with the first practical small diesel engine; each YDP pump combines a pump head and drive engine on a common base frame. This page gathers the YDP versions the register did not assign to its own range from the US EPA certification data. The type designation divides the series into the three frame sizes YDP20, YDP30 and YDP40, each followed by several versions with different letter suffixes.
Read on 3 more paragraphs
The register lists here 24 versions of the YDP series across the three frame sizes 20, 30 and 40, each with several drive variants per frame size. The drive engines produce between 3.5 and 7.4 kW; suction and discharge connections measure 50, 80 or 100 mm depending on frame size, discharge capacity ranges from 550 to 1,750 l/min at heads between 22.5 and 32.0 m, and dry weight lies between 44 and 109 kg.
Engine-driven centrifugal pumps such as the YDP series are used worldwide for field irrigation, construction-site dewatering and as mobile support for fire-fighting water supply, wherever no mains power is available for an electric pump; the EPA certification enables the pumps to be sold in the United States.
On these engine-driven pumps, the condition and running clearance of the impeller, the tightness of the mechanical seal, the condition of the suction and discharge connections, and the actual suction capacity with the engine running all matter; added to that are the usual engine points such as operating hours, compression and the condition of the injection system. Spares run through the worldwide Yanmar dealer network.
Sources: SpecCodex register, model data: Yanmar YDP-Serie, Yanmar (manufacturer)
Technical data
Engine
| Fuel | dieselcorrect |
|---|
Dimensions and weights
| Dry weight | 44 kgcorrect |
|---|
Other data
| Dimensions | 530 x 637 x 484correct |
|---|---|
| Discharge capacity lmin | 550 l/mincorrect |
| Discharge mm | 50 mmcorrect |
| Engine power | 3.5 kWcorrect |
| Head m | 32 mcorrect |
| Suction mm | 50 mmcorrect |
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 8 individual figures for this model. They come from 3 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: Manufacturer documentation, yanmar.com (retrieved August 2026) · yanmar.com (retrieved October 2026) · Data sources and cross-checks
Diesel engine in 3D section
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