8011 Hydraulic

hi zetor people
i have just bought 8011 with lift not working . i replaced pump and 2 filter the lift is working ok but there is a spitting or thumbing noise coming from feed pipe out of pump when i use lift or spools would any one no to cure this thanks

Did you change the oil? It could be contamination in the oil due to water and/or air.

When you operate the spools, are they doing anything? for example ,moving a ram. If you are just moving the levers without working anything I would suspect that the noise you hear is simply back pressure from the relief valve rattling back down the pipes. Which is nothing to worry about.
I am a great believer in the saying" If it aint broke, dont fix it", so if it all works and you have good seals around the Big filter case so as not to let in air, as Tom suggested, then leave alone.
Dave

hi agin yes i change the oil . when post driver is working on tractor you can feel pipes thumbing it does sound like relief valve is week or to strong am thinking of putting a loader on to tractor so thats why would like to sort prob sb