770 just quit

Tx Jim · Feb 5, 2011

4Kings said:
It will crank but it's acting like it's not getting fuel. Anyone have any tips or suggestions

The filter should have a screw to loosen to check for air or fuel. The 770 has a mechanical lift pump to pump fuel from tank to inj pump so that rules out electrical problem to get fuel to inj pump if fuel filter isn't plugged. Does inj pump fuel solenoid "click" when key is turned to ignition? If IP solenoid clicks,loosen injector lines at injectors and crank engine over and see if fuel squirts out.

spruce Deere · Feb 5, 2011

RoyJackson said:
Try jumping it from another battery. Your starter may not be turning fast enough.

2nd what Roy says. The state of the battery plus a loose connection, the age of the battery easily forgot. Try jumping it and test the battery..... If it will not fire just after being ran doubt its fuel, unless it ran out of fuel too....

beenthere · Feb 5, 2011

Tx Jim said:
May I ask how long does it take for diesel fuel to get stale?

Jim
Good catch. Prolly not a good question from me.

I don't know how long, but hear that over time it could. Just something else for the OP to ponder and to rule out as a possible problem.

Tx Jim · Feb 5, 2011

beenthere said:
Jim
Good catch. Prolly not a good question from me.
I don't know how long, but hear that over time it could. Just something else for the OP to ponder and to rule out as a possible problem.

I personally have never seen diesel get stale,contaminated with water & foreign matter, YES

Tx Jim · Feb 5, 2011

spruce Deere said:
2nd what Roy says. The state of the battery plus a loose connection, the age of the battery easily forgot. Try jumping it and test the battery..... If it will not fire just after being ran doubt its fuel, unless it ran out of fuel too....

4Kings stated "It will crank but it's acting like it's not getting fuel".So how can it be battery or connection related????

RoyJackson · Feb 5, 2011

Tx Jim said:
4Kings stated "It will crank but it's acting like it's not getting fuel".So how can it be battery or connection related????

We're not there, of course, but "cranking" doesn't mean cranking fast enough. I've had this problem which is why I always suggest jumping the battery first (least intrusive option).
BTW, jumping the battery will help if it's a battery problem, not if the cables or connections are bad.

Still could be fuel related (the sudden shutdown during operation kind of indicates that) or a blockage in the lines (ice?). I don't know what the average winter temperatures are in NE Mssouri, but a lot of areas are getting lower temperatures then normal. As this appears to be an atypical winter, the fuel sold there may not be winterized. That's strictly a guess on my part.

Johndeerex728 · Feb 5, 2011

The best way to deal with this is for you to first check the fuel and make sure there is no water In it then you should check the fuel filter and make make sure it's not clogged then you should change it and see if fuel flows through it if it does not check in you gas tank for any clogs at the begging of the main line but if fuel is flowing through it choke the machine all the way and let her try to start for 2 mins if it still does not start check the or just replace the spark plugs and if that that does not work check the carborater and see if it might br gunk or if a screw broke on any of the hooks on it but if it's a diesel check or replace the glow plugs then check the injectors. If you don't under stand or require more help please send me a private message or email me.

Johndeerex728 · Feb 5, 2011

What is it gas or diesel

RoyJackson · Feb 5, 2011

Johndeerex728 said:
The best way to deal with this is for you to first check the fuel and make sure there is no water In it then you should check the fuel filter and make make sure it's not clogged then you should change it and see if fuel flows through it if it does not check in you gas tank for any clogs at the begging of the main line but if fuel is flowing through it choke the machine all the way and let her try to start for 2 mins if it still does not start check the or just replace the spark plugs and if that that does not work check the carborater and see if it might br gunk or if a screw broke on any of the hooks on it but if it's a diesel check or replace the glow plugs then check the injectors. If you don't under stand or require more help please send me a private message or email me.

The 770 is a diesel and it has an intake air heater, not glow plugs. If the simple suggestions made on TBN don't work and 4Kings doesn't have the skills, it probably time to let a dealer mech work on it.

As a real quick example, my 790 was left out for a day or two and then wouldn't start. Headlamps were bright.
It would crank, but that drew the battery down pretty quick. I jumped it from a known good battery which got the starter turning fast enough. So, time for a new battery. Cranked fine, but didn't start.
Well, now it seemed like a fuel problem so I went through what most posters here suggested. This transpired over a week or so. No help...still didn't start.
Well, I figured it was one of two things...either jumped timing or an electrical problem. Since I'm an "OK" mechanic (at best) and definitely not good at electrical problems, it was time for the dealer to check it out.
Few days later, I got the diagnosis. It was a bad terminal on the wiring harness. Of course, Deere doesn't sell that terminal as a separate piece, so I'm looking at a $600 wiring harness plus labor. Fortunately, my dealer is a good guy with a good service dept. They found a similar terminal and installed that. Tractor worked fine since.

Some problems are easily found...the thermistor problem on the older 4xxx series Deeres is a good example. It's also an easy, cheap fix.
Other problems, like 4Kings is experiencing, aren't so easy and making a wrong diagnosis can result in more problems then it fixes.