Bobcat 331 Miniex. arm falling or dropping after full retraction, help please

[Stoneandbrick]

hello Guys, i hope this is the right place to get some help from you guys concerning my bobcat 331 miniexcavator. i just change the AUX hose, i replace it and reconnected without bleeding (i called dealer to find out about bleeding hydo oil and they say isn't needed). the thing is that the arm of the machine i falling or dropping after full retraction. i dont know what to do since it is dangerous when working. the machine works good but i dont want to damage it. advices will be really appreciated. please help

 

[whis]

how many times have you raised it? try raiseing it all the way up then all the way down a couple of times

 

[Eagleview]

You need to hook up an attachment (auger/hydraulic grab etc) to the auxiliary lines(making sure you have the taps turned on) and work the Auxiliary pedal a few times in both directions . Lifting the boom wont help as it is on a different circuit . Air in that system could still affect the other functions even though they are on a different circuit as it is a closed loop system and the trapped air could make other functions spongy .

 

[Stoneandbrick]

thanks guys for responding, well i already lifted the arm up and down a couple of times. but the problem persist, i still have to try by attaching an attachment to see is that works, i also saw that the cylinder (the one that lift the main arm), may ave a problem or is leaking because when is lift it it slowly, very slowly starts to go down. this is driving me nuts because as far i know the cylinder should not move because the hydo oil is locked because the vales in the cylinder is closed, (supposedly). im trying to record a video to show you better. thanks!

 

[Stoneandbrick]

[video]file:///C:/Users/Johny/Downloads/bobcat%20331%20arm%20falling%20(2).MOV[/video]
hopefully it works, otherwise i will try to get another one.

 

[davesl708]

[video]file:///C:/Users/Johny/Downloads/bobcat%20331%20arm%20falling%20(2).MOV[/video]
hopefully it works, otherwise i will try to get another one.

Your link does not work. It is mapped to your hard drive on your PC. Try uploading it to YouTube.

 

[Stoneandbrick]

Hello guys, here is the video link, i uploaded to youtube. http://youtu.be/tMqdoQ9TQcE

 

[Morning Wood]

Something seems to be stuck open. It is free falling down. Have you talked to a bobcat dealer or mechanic?

 

[Sodo]

Did you say it falls slowly if you stop it mid stroke - but falls much faster if you come to the top?

 

[Stoneandbrick]

it falls faster after i retracted all the way to the end or to the fully retracted position, that is the only way it falls, sometimes it fall when working, when trying to pick up something kind of heavy or if lifting something heavy it slowly goes down. i will post another video about this.