HI I have an Hitachi EX100-2, which every so often will not lift the main boom, slew or track, but it will crwd and tip the bucket and cycle the dipper. But if you slew slightly before lifting the boom, the boom lifts as normal, but still wont track.The fault never occurs when digger is cold or 'warming up'.
This is a totally random, and intermitent fault without any timetable, it might dig there again it might not!! When its running normally, all services and fine, and the machine has plenty of 'dig', definitly not a failing pump problem.
The pilot filter housing gets very very hot to touch within a short space of time, but this does not affect digging when machine running properly. The oil cooler is clean with air flow going through it properly, there is no debris in any of the hrdraulic filters(pilot circuit, suction or main).All digging and track modes work fine when digger normal, but I can tell when the digger is going to throw a fit, because the services hesitate before responding, and you cant control the bucket as normal.
Then just to confuse matters, the digger will start stalling whenever you move a service.This must be a swash plate thing.Has anyone any ideas as how i could linp digger back home?
I have tried various things that seem obvious to check,
The Outer 'o'ring went on the DP sensor, which I replaced, along with the other two 'o' rings and the plastic washer further down the sensor.(The DP sensor has beem disconnected ever since I had the digger)
(Cleaned out the screen in the banjo fitting.
-Changed the fuel filter (didn't change anything)
-Checked the fuses, check harness wires in pump bay, and replace any dodgy connectors.
cheers
Richard