Help. Hitachi fh150lc excavator hydraulic banging

Hitachi fiat FH150LC mark1 or 2 machine. was OK, new oil and return filter 30 hours ago suddenly now has developed a worrying problem when digging under load for example or even when arm in air and operate 2 rams to full extension and once at extenion, pump is making a bang noise and hose is shaking each time does this See video below to show the problem (just copt and paste into your browswer) operator with boom in

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