Help with no stress EC150

[Nigel Henry]

Hi Jase will ring you tomorrow  cheers..... 

[David Dan]

Hi all. My dad bought an older machine. I have found that the stress system gets the engine speed from the alternator via a green cable (which was cut for some reason and the stress light was just flashing red even with the engine on). After I have put the cable back, the light was working accordingly, red flashing when ignition switch and oil bypass pushed, a yellowish to red color when engine was idle and green when the engine revs. The problem is that the selenoid valve circuit (purple cable) is not getting closed on red light when the engine loses speed. Do you know what could it be?

[Jase hutch]

Hi David  , please can you tell me the model of your chipper  ? Also a serial number would help.

Jase.

[Jase hutch]

Hi David , 

At the Herschmann plug on the solenoid valve you should get +12v and an earth when you have a green light on the No-stress box .

The No-stress box gives the earth.

With a red light you should lose the earth. 

Are you getting these results  ?

Jase. 

[David Dan]

Yes, I didn't try to measure with the green light on, I hope this is it and there is no problem with the stress box. The solenoid valve doesn't close the oil because it may need to be cleaned. I changed the oil and the old one was very bad, so something might have blocked it. I do hear the valve working if I power it manually. I will be back with an update, thank you a lot for your help. :D

[Jase hutch]

There is an 'override ' tap next to the No-Stress solenoid valve  , try turning the lever 90 degrees,  do the feedrollers work then  ?

Jase.

[Jase hutch]

With the ECM150/35D

If you want to check the operation of the No-stress at the Herschmann plug on the solenoid valve , there should be a blue/white wire that's ignition controlled live (with the override button pressed) and a purple wire that's a switched earth from the No-stress box when you have a green light.

Jase.

[David Dan]

Thank you Jase! You are really helpful

I will try this week and come with an update.

David.

[David Dan]

I am back. The stress box works as it should and I get the earth when the greenlight is on. I can hear the solenoid valve working but still the rollers are always moving even when the solenoid valve has no power. Could be a problem with the hidraulic circuit?

[Jase hutch]

Did you try turning the override tap as I suggested  ?

If the rollers speed up when the tap is turned  , the solenoid valve is faulty..

Jase.