Volvo ec 27 digger problem

[Darren]

Hi all
New to group
I have a ec27 Volvo mini digger which has just started doing the strangest of things .
It seems to be creating a elec pulse clicking noise when ignition is on ( not trying to start !) it will start fine tho then it seems to send a pulse through the hydraulics making then like they’re on /off on / off !!.. it even sends a pulse through the hydraulic pipes when the machine is not running but the safety arm is down in the active position .. sometimes it goes ok for about 5 mins then returns for hours even when ignition is just on but no engine or hydraulic s running ???. I’ve unplugged most things all sensors relays etc but unable to locate it s fault ..and it makes no difference unless I totally cut the power .by pulling a fuse .???..
any ideas anyone ???.. it’s baffled me for days now !!
Thx
Darren

 

[V8Druid]

intermittent fault on the servo knock out solenoid - bad connection/earth/coil breaking down - pull the coil off the spindle and see if it cures it - then try giving the coil some direct feed - with a live and an earth - if it doesn't cure it replace the solenoid

 

[Darren]

intermittent fault on the servo knock out solenoid - bad connection/earth/coil breaking down - pull the coil off the spindle and see if it cures it - then try giving the coil some direct feed - with a live and an earth - if it doesn't cure it replace the solenoid

Hi thx for this …where do u the servo knockout solenoid ?…I’m a novice with mechanics..sorry

 

[Darren]

Hi thx for this …where do u the servo knockout solenoid ?…I’m a novice with mechanics..sorry

Find ..?

 

[V8Druid]

well a not so easy way would be to trace the wiring back from the dead man switch, which controls the lock out solenoid.
Aiden @CPS or a few others on here with experience of your model could probably tell you where it's located.
I'm not sure whether you'll have a separate servo pump or whether it's reduced to servo pressure from the main pumps with a PRV somewhere? -
most likely the latter -
best guess from experience of smaller Ovlovs is under the floor plates

(PRV = pressure relief valve)