My JD 755 was working great and then wouldn't start. The starter turns fine, but the engine won't kick in. I removed the filter, cleaned the bowl and bled the lines. It started and ran for a minute before it started running roughly and then died. I figured I had some bad gas, so I drained the tank and bled the lines again. It still wouldn't start. I have fuel flowing into the injector pump, but nothing comes out. Is there something that would keep the pump from starting, or do I need to replace it? If I need to replace it, how do I do it?
JD 755 won't start
- Thread starter drcaseyd
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2manyrocks
Super Member
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What happened before it wouldn't start? Did you run out of fuel?
The couple of times I ran out of diesel and had to re-prime the system, I had the same symptoms as you described and just had to be patient in working the air out of the system. Any air in the system is going to cause you problems until you can bleed it out--and it takes patience.
If nothing is coming out of the injectors when you crack the injectors a bit to get the air out, then you would have to look more closely at the injector pump.
The couple of times I ran out of diesel and had to re-prime the system, I had the same symptoms as you described and just had to be patient in working the air out of the system. Any air in the system is going to cause you problems until you can bleed it out--and it takes patience.
If nothing is coming out of the injectors when you crack the injectors a bit to get the air out, then you would have to look more closely at the injector pump.
No, I didn'trun out of fuel. I've gotall the air out of the systme up to the injector pump. I've read some more, and I'm thinking I have a problem with the shut off solenoid. The big problem now is I don't know where it is or how to check. Any suggestions?
JD755
Platinum Member
The fuel solenoid is just below the yellow fill cap and has the rubber bellows on it. It has two electrical coils in it. One to pull in the solenoid during start, and a latching coil to hold it in during use. Here is a previous thread with more detailed info.
http://www.tractorbynet.com/forums/john-deere-owning-operating/152097-755-hard-start-wont-idle.html
http://www.tractorbynet.com/forums/john-deere-owning-operating/152097-755-hard-start-wont-idle.html
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I'm glad you got your 755 fixed. I just had the same thing happen to my 855, but for a different reason.
I put my BH on to do some digging, had my brother start it and drive it out of the barn where the BH was stored. Got to the work site and started digging. Smelled something like hot plastic, and the engine died,.....but the starter was running! When my brother started it to take it out of the barn, the ignition must have not disengaged and I assume the starter was running for the 15 minutes or so, I was using the backhoe! I think the extra strain on the electrical system must have burnt out the fuel solenoid, cause it was definitely fried.
Will p/u the replacement solenoid tomorrow and get back to work. Anyone else have this happen?
Also, found and extra spring connected to the solenoid arm to keep it open while the engine was running, so I guess the last owner must have had a problem with it too.
Phil
I put my BH on to do some digging, had my brother start it and drive it out of the barn where the BH was stored. Got to the work site and started digging. Smelled something like hot plastic, and the engine died,.....but the starter was running! When my brother started it to take it out of the barn, the ignition must have not disengaged and I assume the starter was running for the 15 minutes or so, I was using the backhoe! I think the extra strain on the electrical system must have burnt out the fuel solenoid, cause it was definitely fried.
Will p/u the replacement solenoid tomorrow and get back to work. Anyone else have this happen?
Also, found and extra spring connected to the solenoid arm to keep it open while the engine was running, so I guess the last owner must have had a problem with it too.
Phil
JD755
Platinum Member
Sorry to hear the problem. Not something you might expect. I would guess the coil to pull in the solenoid is not rated for continuous duty. It is a pretty powerful one and only to be on for the time it takes to start the engine. The other coil is a smaller, less powerful, continuous duty one. It only has to hold in the mechanical latch that keeps the solenoid engaged during operation. I hope there was no damage to the starter motor from overheating.
855Idiot
Bronze Member
That same sticky solenoid was the reason I pick up my $855 so cheap!
I still have not replaced it, I just turn off the key and then push the
solenoid shaft forward to kill it.
How much is that solenoid?
I love my 855,
Glenn
I still have not replaced it, I just turn off the key and then push the
solenoid shaft forward to kill it.
How much is that solenoid?
I love my 855,
Glenn
JD755
Platinum Member
Part Details
Part Number: AM124377
Part Price: 119.90 USD
On Hand: 0 Check Other Stores
Description: SOLENOID, FUEL
GrandwindFarm755
New member
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- Apr 24, 2018
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- 1
- Tractor
- John Deere 755 Compact Utility Tractor
Good Forum and Thread. I had the same non-start issue as "drcaseyd". 755 started and ran fine, turned it off for a few minutes, had starting issues when i tried to restart. Cranked fine but did not turn over. With the throttle up all the way, I was able to get it running and limp back into the garage. Bled all the lines and no issues there. Started looking at the fuel shut off solenoid and wondering how it worked. When you turn you key to the run position, you should hear the fuel pump clicking, when you turn it to the start position, you should hear another click just before the engine start cranking. That click would be the fuel shut off solenoid engaging or its shaft retracting into the housing to allow fuel to flow. there are three wires to the solenoid, a white wire which comes over the top of the engine from the starter, one red and one black wire which feed into a connector. The white wire from the starter is the one which engages the solenoid with 12v when you turn the key to the start position. You can disconnect that wire, and manually introduce 12v to the end of the lead and see if your solenoid engages or has the shaft retract into the housing. When I did this on mine, i got nothing. With the key in the run position, I did have 12v between the black and red wires on the connector feeding the solenoid. Not sure where that black ground lands but i did do a continuity check with the black wire on the connector back to the negative of the battery terminal and I had continuity, and good ground. Vs buying a new solenoid online for $80, I opted to pay $133, and get it same day from JD. Installed and all is fine. Before I installed however, I did check resistance on the solenoid leads. On the new solenoid, red-black was 10.26kohms and white-black gave me no reading. On the new solenoid, red-black was 10.01 kohms and white-black was 9.98kohms. Another good way to determine if you have a shot coil prior to plunging into $133. The part number for my 755 was an AM124377, original part marked in the pic was AM102863 which must be discontinued.
Not much you can do to rebuild the Solenoid when it fails.
Not much you can do to rebuild the Solenoid when it fails.
