S770 will not start

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Nrsimons

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Joined
Dec 24, 2018
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Was using machine with grabtech bucket. Loader would not go down. I shut off and restarted and still would not go down. I shut machine off for the night and went out the next morning to start and machine would not start. Changed battery as it sounded a little weak. Still nothing. No codes. Has fuel. Relays and fuses look fine. Master fuse is fine. Machine cranks and will not start. I lowered the arms with the red button by seat. Fuel problem? Solenoid? Want to change fuel filter but need to get one from dealer. Any ideas out there? Thanks Nate
 
When I turn the machine over for a bit (trying to start).. the AUX -green light - comes on. Like the AUX is still on. Maybe this is not allowing the machine to start. Not sure how to get the AUX off. When I had the grapple on it would raise some while I was trying to start it also..
 
Nrsimons said:
When I turn the machine over for a bit (trying to start).. the AUX -green light - comes on. Like the AUX is still on. Maybe this is not allowing the machine to start. Not sure how to get the AUX off. When I had the grapple on it would raise some while I was trying to start it also..
Click to expand...
It does sound like the aux hydraulics are sticking, but for the light to be on, the computer must be turning it on.... It would put a load on the system making cranking much harder.
Just not sure what could be turning the hydraulics on, as it is off when you start and you need to hit a button to turn on, so very odd.
 
Tazza said:
It does sound like the aux hydraulics are sticking, but for the light to be on, the computer must be turning it on.... It would put a load on the system making cranking much harder.
Just not sure what could be turning the hydraulics on, as it is off when you start and you need to hit a button to turn on, so very odd.
Click to expand...
I finally got it to start. Changed the fuel filter and primed it and it took a lot of cranking to get it started. I left it overnight again and than it would not start the next day. Sucking air.. Maybe need to change the filter housing or gaskets.. But the loader hydraulics don't work like originally when I shut it off. Go up but not down. Need to check some things out. I have another post and will reply to that for now.
 

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