32. Ok now lets give them some constrains . 33. First create two locators , called locator1 and locator 2 , and place them as shown in the fig.

34. Ok now lets start linking, first select locator 1 and then locator 2 and give then aim comstrain . And now select locator 2 and locator 1 and give an aim constrain again..

35. Now select your locator 1 and the arm 1 group and press p for making the child parent link..

36. Now select the rod of the hydrolics and the locator 1 and press p for making child parent link between them..

37. Now select the locator2 and the main hydrolic and give then a parent constrain..

38.Now select your group arm 1 and rotate it in x axis the hydrolic will move accordingly..