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John Deere Tractors Discussion Forum
:

Deere 755 slow starting after sitting overnight

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Cnv65stang

05-11-2020 18:24:34




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I just got this tractor. It is a Deere 755 either a 60" belly mower. I am starting to have a bad feeling about the deal. The tractor shows 515 hours. Previous owner claims it was working prior to me picking it up... but isnt working now. tractor is clean and does not show any signs of high hours. My problem is that in the morning the tractor cranks 15-20 seconds or so and stumbles then fires up and runs great. If I shut it down and then restart later that day it fires right up and till runs great... just starts slow after sitting overnight. Any help would be appreciated!

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Cnv65stang

05-13-2020 14:18:21




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Yeah... and relatively cheap too.



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Scott 730

05-13-2020 12:33:04




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
It's a good day when the fix is easy. :D



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Cnv65stang

05-13-2020 10:40:25




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
By the way.. the glow plugs are the NGK Y702r (1065) - They are on Amazon for about $24 each, ORiley's had them for $21, Advanced said they couldn't get them, and John Deere had them for $44 each.



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buickanddeere

05-13-2020 10:22:23




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
That is excellent news. Thank you for the follow up.



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Cnv65stang

05-13-2020 05:38:11




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I went out this morning (it is 58 degrees) and cranked the 755... on the third turn over it hit and ran just fine. Thanks for the help.



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Cnv65stang

05-12-2020 15:36:34




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I found the glow plugs at the local ORiley's. They were $21 each, but if that works, it will be money well spent. I will try it out in the morning to see if it fixed the problem, and I will report back.



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Cnv65stang

05-12-2020 12:20:10




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Are these glow plugs the NGK y702r (1065)?

Thanks.

David



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Cnv65stang

05-12-2020 12:17:19




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I tested the glow plugs on ohms

I tested the red timer wire in volts

Pulled the glow plugs and got a nothing reading.



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buickanddeere

05-12-2020 10:53:55




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Quoting Removed, click Modern View to see

On the ohms or volts setting ?



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Cnv65stang

05-12-2020 10:34:53




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Ok. Put ohm meter (cheap one from harbor freight) on it. When I touched the two leads together I got a reading of 0.6. Whwn I touched the negative terminal to the negative batt post and the positive to the top of the glow plug I got a 1 at the left side of the screen which means no reading. I assume this means they are bad. I tested the timer and I got a little more than 12 volts for about 10 seconds then I got a 0.

I have a 755. I know it has the glow plugs but everything I have read says the 855s dont, but I am not really concerned about the 855s because that isnt what I have. I was just responding to another poster.

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Cnv65stang

05-12-2020 05:10:21




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I have looked up glow plug testing and will do that when I get outside to look at it today



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Cnv65stang

05-12-2020 05:07:45




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Thanks for the welcome. I have read on here for years just never posted.

I have the operators manual and I have read it. I know when and how to use the glow plugs, and have been while starting it. Temp outside has ranged from 45 to 60 with same results when trying to start it.



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Tx Jim

05-12-2020 04:51:16




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Welcome to YT

I agree if you don't have an operators manual for your tractor you need to acquire an OM & read it. Some glow plugs are activated automatically during start cycle & some GP's must be activated by operator. One can utilize a VOM or ammeter to check GP's. Glow plug for your tractor if needed is part # M87919



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buickanddeere

05-12-2020 04:01:04




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
How cold is the ambient temperature ?

If the operator's manual was lost and the instructions with it on how to use glowplugs etc. A call to the nice folks at 1-800-522-7448 will obtain the info on CD or hard copy.



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Cnv65stang

05-12-2020 03:43:44




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I am kinda new to diesels. I have a couple of gas tractors. How do I check the glow plugs for correct operation?
]



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Cnv65stang

05-12-2020 03:40:13




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
The 755s and 655s do have glow plugs, the 855s and 955s do not. I dont know about the 50 series tractors for sure. I know to turn the key wait for the plug light to go off, then try to start. Probably should have mentioned that originally.



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J Hamilton

05-12-2020 09:47:47




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-12-2020 03:40:13  
855 tractors do have glow plugs. We have two of those tractors where I work.



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Gene Davis (Ga.)

05-11-2020 19:13:55




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I have a 650 and it is a smaller 2 cylinder version of this engine, the 750 series is a 3 cylinder. These tractors are really Yanmars just made for Deere. They do not use glow plugs for cold starting. They use a thing known as a thermostart system like some of the older Massey Ferguson/Perkins engines did. You are supposed to turn the key to the left for 30-45 seconds and it heats an element in the intake that actually starts a small fire in the intake to heat the air. When the engine cranks it sucks the flame out and all is well. My 650 is an 1981 model and it has always started well if I use the correct cold start procedure for starting it.

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Scott 730

05-11-2020 18:51:37




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
Check glow plugs for proper operation.



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J Hamilton

05-11-2020 18:51:27




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 Re: Deere 755 slow starting after sitting overnight in reply to Cnv65stang, 05-11-2020 18:24:34  
I have a John Deere F935 with a diesel and I just set the throttle just under half and it does fine until the engine warms up otherwise it will try to stumble too. Might check the glow plugs, I think I need to change them on mine.



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