How the excavator working?

When the excavator working,you may see it working as a regular action.The hydraulic pump push hydraulic oil and the control valve change the oil seal flow direction.So the excavator working is a series of action.And the control valve seal kit nearly all is o ring.(some have skeleton oil seal)

The white gasket(T3P/T3G) use with o ring. It share the o ring pressure.And the o ring prevent oil seal leakage.

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