The KX121-3α is a model of "conventional" type, equipped with the new hydraulic system " Load Sensing " which allows to optimize the oil flow in the circuit according to the demand and has a complete basic equipment. Standard, the Auto-Idling system (A.I) enables the user to save money on energy costs.
| Weight can. / cabin (kg) | - / 3980 |
| Max. digging depth (mm) | 3510 |
| Engine power (HP/rpm) | 40 / 2250 |
| Bucket capacity (m³) | 0,12 |
| Max. digging force (kgf) | 3315 |
| Machine size (mm) | 1700 |
| Zero-tail swing | No |
| Suitable hammer | KM 200 |
| Weight can. / cabin (kg) | Max. digging depth (mm) | Engine power (HP/rpm) | Bucket capacity (m³) | Max. digging force (kgf) | Machine size (mm) | Zero-tail swing | Suitable hammer | |
| U30-3α2 | 3250 / 3360 | 2885 (3060) | 26,6 / 2200 | 0,09 | 2650 | 1550 | Yes | KM 200 |
| U35-3α2 | 3480 / 3590 | 3150 (3350) | 27,5 / 2300 | 0,11 | 3180 | 1700 | Yes | KM 200 |
| KX91-3α2 | 3130 / 3240 | 2900 / 3180 | 26,6 / 2200 | 0,089 | 3050 | 1550 | No | KM 200 |
| KX101-3α2 | 3410 / 3520 | 3100 / 3300 | 27,5 / 2300 | 0,107 | 3180 | 1550 | No | KM 200 |
| KX121-3α | - / 3980 | 3510 | 40 / 2250 | 0,12 | 3315 | 1700 | No | KM 200 |
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