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The Develon DX50z-7 midi excavator has a Develon D18 diesel engine designed to deliver superior performance and fully compliant with the latest Stage V emission regulations. To optimize machine performance, the engine uses high-pressure fuel injectors, an air-to-air intercooler and electronic engine controls. 4-stroke water-cooled, turbocharged, diesel oxidation catalyst (DOC).
| Fashion model | Doosan D18 |
| Number of cylinders | 3 |
| Rated Power at 2200 rpm (SAE J1449) | 36.4 kW (48.8 hp) |
| max. torque at 1600 rpm | 18.4 kgf m |
| Idle (low - high) | 1150 - 2000rpm |
| Engine capacity | 1800 cm³ |
| Bore x stroke length | 90mm×94mm |
| starter motor | 12V / 2.7kW |
| Batteries, alternator | 1 × 12V, 100Ah – 12V, 90A |
| Air filter | Dual element air purifier |
| Main pump maximum flow at 2200 rpm | 138.6 l/min |
| Maximum swing speed | 9.8rpm |
| Maximum swing torque | 1380 kgf m |
| Driving speed (low - high) | 2.6 - 4.4 km/h |
| Maximum traction | 4.58t |
| Maximum climbing ability | 35° / 70% |
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