| THE MODELS FOR EXCAVATOR |
| FOR HITACHI |
| EX40-1 | EX40-2 | EX55 | EX60 | EX60-2 | EX60-3 | EX60-5 | EX70 | EX75 |
| EX100 | EX110 | EX120 | EX120-1 | EX120-2 | EX120-3 | EX120-5 | EX130-1 | EX200-1 |
| EX200-2 | EX200-3 | EX200-5 | EX220-3 | EX220-5 | EX270 | EX300 | EX300-1 | EX300-2 |
| EX300-3 | EX300-5 | EX300A | EX330 | EX370 | EX400-1 | EX400-2 | EX400-3 | EX400-5 |
| EX450 | ZAX30 | ZAX55 | ZAX200 | ZAX200-2 | ZAX330 | ZAX450-1 | ZAX450-3 | ZAX450-5 |
| ZX110 | ZX120 | ZX200 | ZX200-1 | ZX200-3 | ZX200-5G | ZX200LC-3 | ZX210 | ZX210-3 |
| ZX210-5 | ZX225 | ZX240 | ZX250 | ZX270 | ZX300 | ZX330 | ZX330C | ZX350 |
| ZX450 | ZX450LC | ZX500 | ZX500LC | ZX520 | ZX670 | ZX690 | ZX870 | ZX130 |
| ZX170 | ZX170LC | ZX195 | ZX260 | ZX360 | ZX360LC | ZX400 | ZX470 | ZX490 |
| FOR KOMATSU |
| PC20-7 | PC30 | PC30-3 | PC30-5 | PC30-6 | PC40-7 | PC45 | PC45-2 | PC55 |
| PC120-6 | PC130 | PC130-7 | PC200 | PC200-1 | PC200-3 | PC200-5 | PC200-6 | PC200-7 |
| PC200-8 | PC210-6 | PC220-1 | PC220-3 | PC220-6 | PC220-7 | PC220-8 | PC270-7 | PC202B |
| PC220LC-6 | PC220LC-8 | PC240 | PC300 | PC300-3 | PC300-5 | PC300-6 | PC300-7 | PC300-7K |
| PC300LC-7 | PC350-6/7 | PC400 | PC400-3 | PC400-5 | PC400-6 | PC400LC-7 | PC450-6 | PC450-7 |
| PC600 | PC650 | PC750 | PC800 | PC1100 | PC1250 | PC2000 | PC360 | PC460 |
Working principle
Oil suction process: The plunger moves backwards, the pump chamber volume increases, forming a vacuum, and the hydraulic oil in the oil tank enters the pump chamber under atmospheric pressure.
Oil pressure process: The plunger moves forward, the pump chamber volume decreases, the hydraulic oil is compressed, the pressure increases, the oil outlet valve is pushed open, and high-pressure oil enters the hydraulic system.
performance parameter
Displacement: The volume of oil discharged by the pump shaft per revolution determines the working speed and force of the excavator.
Pressure: The pressure of the oil at the pump outlet determines the working capacity of the excavator.
Rotational speed: The rotational speed of the pump shaft affects the flow rate and lifespan of the pump.
Efficiency: The ratio of output power to input power of a pump, reflecting energy loss.
