back hoe will not swing in one direction, kubota L45 less then 400 hours

[workinallthetime]

i have noticed over the past few weekends the BH would move on its own to the right side while driving around doing loader work. A few days ago i noticed the BH would not swing from right to left w/o high engine rpm's, once i was able to move it i did not have any more trouble that day. Today it will not swing at all from right to left, swings fine from left to right.
i got off the tractor and was able to pull the BH from center to the left position while holding the lever in the direction i wanted it to swing and pulling with the other arm.
my question how would you diag if this is a cylinder problem of a valve problem? any help would be great.

 

[CreekyB]

99% sure it is not going to be a cylinder issue. I would look into the valves and controls more. If you are looking to trouble shoot it yourself you are going to need a hydraulic pressure gauge.

 

[wdchyd]

Swap the hoses on the swing cylinder(s).....if the problem reverses then research valve troubles, if still have problem in same direction then cylinder piston seal is bypassing or nut came off inside cylinder