Volvo EC160b

[mpaulson22]

Just picked up a drunken auction purchase a 160b and noticed when you go to boom up, there is about a one second delay before it reacts. Curious if anyone has had this problem or where to start looking for the issue. Hydraulics seem strong just have a lag

 

[funwithfuel]

Does it have boom rupture valves?

 

[mpaulson22]

I’ll have to look, Is that like pilot relief valve?

 

[funwithfuel]

No, well kinda. It's a big block that is fitted to the base end of each cylinder. It requires a pilot signal to unlock the cylinder to allow extension or retraction. Its pretty noticeable

 

[mpaulson22]

Ok I’ll check it out when I get back from Texas. Out of curiosity what makes you go to that right away? I don’t know much about hydraulics but fast learner

 

[mpaulson22]

No, well kinda. It's a big block that is fitted to the base end of each cylinder. It requires a pilot signal to unlock the cylinder to allow extension or retraction. Its pretty noticeable

 

[funwithfuel]

In those pics, you dont have them.

 

[mpaulson22]

Eliminates that then

 

[funwithfuel]

Does the boom drop prior to raising?

 

[mpaulson22]

No, just seems like functions are retarded by a second but have full power

 

[funwithfuel]

All functions or just boom?

 

[mpaulson22]

All

 

[funwithfuel]

I would check your pilot lines from the pump to the accumulator and from the accumulators to the safety solenoid. Blow the line clear and check for debris.

 

[Vetech63]

Just picked up a drunken auction purchase

LOL.....thats worst case scenario right there!

 

[mpaulson22]

So it’s been at the Volvo dealer and they’ve been testing everything abd setting the pressure back where they should be, tracks right, sticks out and curls right, still delay in boom up and down but once you boom up and then go to boom up again it reacts like it should. If you wait a little bit or use different function the delay is back. Changed pattern changer to see if it was in the controls and reacts the same... what’s the next thing to check?

 

[funwithfuel]

Measure pilot pressure from RCVs to MCV. See if Right RCV delivers weaker pilot signal. If it does, check hose feeding RS RCV , see if the filtered inlet is jammed up with vinyl.

 

[uffex]

Good day
Illustration may help
Kind regards
Uffex

 

[funwithfuel]

Don't forget, boom up doesn't only affect boom 1 you also have boom 2 spool coming into play. As the image shows, in boom up at full stroke on the boom 1 cap, you should see 100% of pilot oil pressure. In the middle of the travel as speed and load dictate, boom 2 will open adding oil from second pump to converge with pump 1 so you don't have slow functioning. There are a lot of things going on here, all with little input from the operator.
Good luck, hopefully your dealer tech is competent and has the experience to troubleshoot this methodically. I have heard both good and bad about your dealer up there. Best of luck.

 

[uffex]

Good day I hope
Sincere apologies guys for giving a bum steer please see amended illustration.
Kind regards
Uffex

 

[mpaulson22]

Don't forget, boom up doesn't only affect boom 1 you also have boom 2 spool coming into play. As the image shows, in boom up at full stroke on the boom 1 cap, you should see 100% of pilot oil pressure. In the middle of the travel as speed and load dictate, boom 2 will open adding oil from second pump to converge with pump 1 so you don't have slow functioning. There are a lot of things going on here, all with little input from the operator.
Good luck, hopefully your dealer tech is competent and has the experience to troubleshoot this methodically. I have heard both good and bad about your dealer up there. Best of luck.

thanks for your input, I understand what you are saying I just don’t have time to check or the gauges so I left it with them, I’ll forward your message thanks again!!