Schwing 34X boom issue
Lionel 10-11-2017 comment profile send pm notify

My last and final issue on this truck; 

It relates to the boom´s hydraulic system. Once the pump has been activated with all E-stops cleared, the second stage boom lever automatically forces to ´fold´ (down).  It does this many times and suddenly stops doing it after a few days. Then the problem will reappear after a week or two. I have to literally tie the lever with something to stop it from going down with an assistant working with me to control that particular stage if needed. I noticed that the problem also affects the first stage boom occasionally. Yesterday the first stage suddenly unfolded (raised) on its own then stopped. I have ruled out electrical issues by disconnecting the solenoids for the second stage when it acts up so, I am almost convinced that it is hydraulic failure somewhere.


Any ideas guys?


pudg2 10-13-2017 reply profile send pm notify

to me it sounds like a joystick issue , does it do it on hardwire and wireless ? I would think this would be your first step in checking for the root of the problem , in most my experiences this is the issue

30something 10-16-2017 reply profile send pm notify

Sounds like a bad pulsar coil.  Whats your oil like?

Cplarcher 10-17-2017 reply profile send pm notify

Had this happen to our 04 34x as it turned out we had bad coils on the spool valve body. super easy to replace runs like a champ, if not then i would look at the spool valve assy for possible internal leaks

pudg2 10-18-2017 reply profile send pm notify

I have had pulsar issues , never had a function do that , just the proportional was very rough , but very good to know , thanks.