Kolbelco sk130 LC excavator travel trouble

[mrs4020]

I found a sk 130 excavator that I was thinking about buying, it does have a problem though. Starts and runs good but soon after putting the safety switch in operation the tracks start pulling, the levers don't seem to stop them. One track goes forward and the other goes in reverse. I do see a couple of new hoses under the operators station. The guy that owned it passed away several years ago and his wife does not know anything about it. She did say he was working on it when he had health problems. Any help will be appreciated.
Thanks, mrs4020

 

[lantraxco]

Sounds like he might have some pilot lines crossed up. Beyond that I have no idea.

 

[grandkobelco]

You quit likely have crud or rust in the pilot valves so the plungers are not centering. wes

 

[mrs4020]

Sounds like he might have some pilot lines crossed up. Beyond that I have no idea.

Thanks, do you know how the pilot lines are routed on this machine? I don't have a manual and would like to get them connected correctly to try it out before I purchase it. If I end up buying I will get a service manual.

 

[lantraxco]

Sorry, I do not. Grandkobelco made a good point, if the joystick plungers are sticking that will create the symptoms you describe.

 

[mrs4020]

I have purchased the sk130 and I bought a service manual. I did find 2 of the pilot lines crossed up and corrected that issue. I suspected the swivel so I pulled it out and replaced the seals. I did not see any bad ones. I put back together and when I put the safety lever down for operation both tracks pull in reverse fast, the only way to stop it is to push the track levers all the way forward and the machine will stop but not move forward. When I hold the levers all the way forward and use some of the bucket controls the tracks try to move in reverse more. Any ideas? Thanks for any help.