please help hitachi ex200-1 boom down and weak swing

hi guys,,any one help me? my hitachi ex200-1 weak swing and when you swing then stop vibration begin on turn table when i stop to swing,and when i swing and lift cylinder raise,vibration on the turn table will continues when swing and boom both move.and when i pull slightly the lift control lever to raise the boom move down slowly,but when i pull at half or full the lift control lever the boom will raise,any suggestion i'll appreciate,thanks a lot.