Its an Hitachi digger-huge...Should turn off on key but won't.Have disconected battery, no effect. Digger can't be moved as only 1 track on at present.

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Pressure valve? does it only do it to only one side? Left or right. The reason you move both tracks with the bucket running is because you relieve pressure. One side is free wheeling, As they call it. I work on cars, But also have done to many hydraulic components. You have a pressure control valve that is bad.

Either slew motor or a shuttle valve

Hi I have the same problem,zx16hitatchi mini and I've been told it is track motor needs replacing? Or it could be a seal gone in one side of the spool valve for that track, on the hydraulic pump? Ask a local digger parts dealer for a good repair shop in your area.

check for a continuous power supply to the solenoid in the fuel pump that shuts off the fuel. It is usually spring loaded and shuts of a hole when the solenoid power is turned off.. Check solenoid is working properly

Undo the nut the nipple fits onto ,thats the valve itself.
Then lift up the machine with the arm over the side that the tracks off  about 2 - 3 foot  so it helps the track to go in and on and start putting the track on at the sprocket end first.
When you get the track to the idler end it will push the grease out as it rolls on or you can lever it home with a big bar before tracking up .

Slack off the track adjuster valve, spin the track off and pull out the idler assy. The seal is on the end of the chrome  piston just pull it out .

if its a hydraulic clutch & conneted to the same system & its low on fluid then that will be your problem
just top it up & try it you may have to bleed out the system of air if it doesnt work!

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