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Practical way to check the unload valve of excavator pc 200-8 komatsu
Each Komatsu excavator has an unload valve which functions to maintain the pressure on the hydraulic pump of 35 kg/cm when the excavator is in neutral. when the hydraulic system is working, the unload setting is higher than the main relief setting due to the help of load sensing pressure or LS. damage to the unload valve can be the cause of the excavator sluggish and slow
How to check Unload:
1. make sure people are not damaged
2. make sure the spool is not jammed
3. Blow at the end of the unload if it leaks then it must be replaced