L785 no go no start no fun

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Rayhat

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Nov 17, 2014
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14
1992 diesel. Fourth owner 4K hrs. Go to purchase running fine. Lifts turns backwards towards everything it should. Pay for it 5K. Load it up get it home pull of trailer. Leave it idle for 10 minutes to park trailer lift bucket up half way and she stops all hydraulics. No control at the sticks no controls at the pedals. No up no down no back and forth. Engine sounds fine. Shut it off to see if boom will leak down, nothing. Go to start it total zero. No crank no starter noise no nothing. Turn key to start, Hyd Charge light, alt light, engine oil press light come on and constant buzzer. Engine oil low, hydraulic oil low and milky white. Remove drain plug from reservoir (nice mess) drain everything I can, hydraulic hoses where I can. Remove suction screen completely clogged. Soak in kerosene clean up nicely soak and clean breathers. New filters, 22 gallons new hydraulic fluid, new oil and diesel filters. Fill hydraulic filters before installing. Buy new bigger wrenches. Get operator and service manuals. Get in go to start same thing. Three lights no turn over steady buzzer. Do I need to prime something, is there a sensor stuck giving a false reading. Why can't I find anything about that buzzer. Does the seat switch have some control over the starting ability. I'm leaning towards electrical, but why did I loose all hydraulics. Got plenty of milky white fluid at screen filter in standpipe when I removed cap. Not sure how much fluid I got out, definatly 10-15 gallons. It doesn't look abused shows some neglect. (Low fluids.) what am I looking at next.
 

antfarmer2

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Oct 28, 2013
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2,801
Seat switch sounds like a good place to start also look for a lap bar switch and seat belt one
 

jerry

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May 3, 2007
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Seat switch sounds like a good place to start also look for a lap bar switch and seat belt one
Antfarmer is right , seat or seatbelt switch may be locking you out if not contacting. Try the seatbelt repeatedly first, sometimes grit gets in there. Hate to say it but if the oil is still milky it should be changed again.
Look up above on the side to see if you have a service/ run switch also.
 
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Rayhat

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Joined
Nov 17, 2014
Messages
14
Antfarmer is right , seat or seatbelt switch may be locking you out if not contacting. Try the seatbelt repeatedly first, sometimes grit gets in there. Hate to say it but if the oil is still milky it should be changed again.
Look up above on the side to see if you have a service/ run switch also.
I contacted last owner and he says theres a loose connector in the cab and this has happened to him before. Going to check after thanksgiving
 

Ivan

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Jan 14, 2011
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215
I contacted last owner and he says theres a loose connector in the cab and this has happened to him before. Going to check after thanksgiving
Check the wires coming out of your seat switch at the conector on the switch.
 
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Rayhat

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Joined
Nov 17, 2014
Messages
14
Check the wires coming out of your seat switch at the conector on the switch.
ok. Loose connection at ignition module is the big problem. So now we know. Little dielectric grease and some support to get past that. Now lights go out when cranking as they should, but I lost the diesel prime. She cranks fine but no fuel to cylinder. Trying to find info on bleeding air out of 3.3l Ford. Looks like I have to remove engine shroud to get to injectors at the block. Can't find any bleeders at the fuel filter or pump. Tried hand priming with the key on and while cranking no luck. She cranks and a slight puff of exhaust comes out. And I mean like a lite drag on a cigarette. Just put in 5 gallons of diesel so she has fuel. That's the update.
 

antfarmer2

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Oct 28, 2013
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ok. Loose connection at ignition module is the big problem. So now we know. Little dielectric grease and some support to get past that. Now lights go out when cranking as they should, but I lost the diesel prime. She cranks fine but no fuel to cylinder. Trying to find info on bleeding air out of 3.3l Ford. Looks like I have to remove engine shroud to get to injectors at the block. Can't find any bleeders at the fuel filter or pump. Tried hand priming with the key on and while cranking no luck. She cranks and a slight puff of exhaust comes out. And I mean like a lite drag on a cigarette. Just put in 5 gallons of diesel so she has fuel. That's the update.
Spray some wd40 in it and try to start ......check your filter for water or ice and jelled up fuel
 
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