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JD 855 Compact fuel mixture

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Guy Snyder

07-23-2002 04:23:40




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Hello,

I just picked up an 855 compact 4x4 this past weekend with just over 600 hours. Real nice shape and runs very well, but seems to be a little smoky under load. I am used to a 755 and that one will puff every now and then under load, but this 855 seems to be a little excessive to me and you can smell diesel fumes alot more, gets a little annoying at times. It's really not terrible, I would just prefer it be a little less smoky if it's as simple as an adjustment. Someone mentioned that the fuel may be turned up on it some to give it more power. I wondered if this could be true and/or if there is a way I can adjust the mixture to lean it out some? I know gas engines but know little about diesels. Also, does anyone make a quieter muffler for these tractors? Thanks in advance!

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Guy

07-24-2002 05:15:21




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
Thanks for the feedback. The tractor has 615 hours on it. According to the seller, the tractor had been serviced yearly by Deere. Everything seems to be very tight and I think the tractor was fairly well kept. The smoke is usually when first starting it up and whenever the governor kicks in or the tractor experiences a load, it does clear up for the most part, fairly quickly. Clooney may have a point about the exhaust. Could be that it is just more noticeable given that the exhaust exits through the front side panel, rather than low on the frame like the 755. I have checked the air and fuel filter and they are both new. It always starts right up, no problem. I guess I was just hoping there was some sort of adjustment somewhere to turn the fuel down. Sound like maybe I need to look at the injectors.

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Clooney

07-24-2002 06:58:11




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 Re: Re: JD 855 Compact fuel mixture in reply to Guy , 07-24-2002 05:15:21  
Guy, I'm getting old & forgetful. I should have mentioned to make sure the thermostat is working, if those little oil burners run cold they will smoke more....



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Guy

07-24-2002 11:13:52




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 Re: Re: Re: JD 855 Compact fuel mixture in reply to Clooney, 07-24-2002 06:58:11  
Thanks Clooney,

Any easy way to tell short of installing a manual guage? Like your 755, this just has an idiot light. Thanks...



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Clooney

07-24-2002 13:07:58




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 Re: Re: Re: Re: JD 855 Compact fuel mixture in reply to Guy, 07-24-2002 11:13:52  
Guy, the easy way is to just feel the upper rad. hose after you have used it a while. If it's too hot to touch you are probably hot enough. If cool you might check the t-stat..... .



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Green_in_MI

07-23-2002 17:18:48




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
I have been reading over the troubleshooting section for my JD compact diesel and it says.
Engine emits black or grey exhaust smoke:
improper type of fuel
plugged air intake system
operating at too fast ground speed for conditions
dirty or faulty fuel injectors-see your JD dealer
engine out of time

Engine lacks power:
improper type of fuel
plugged air intake system
plugged fuel filter
engine overheating
operating at too fast ground speed for conditions
engine viscosity too high
low coolant temperature
improper valve clearance
dirty or faulty fuel injectors
injection punp out of time
attachment improperly adjusted
improper ballast - adjust load
rockshaft stop valve closed

I know you did not mention loss of power but I thought I would add the whole list FYI. The 755 and 855 are similar in power. Do they seem that way when in use? I suggest that you ask that question on the Tractor by Net board. The forum is aimed at compact tractor users and you may find an answer there.

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Guy

07-24-2002 05:02:53




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 Re: Re: JD 855 Compact fuel mixture in reply to Green_in_MI, 07-23-2002 17:18:48  
Thanks. There is definitely a difference in power between the 755 and 855. I can't say that it is enough to warant one over the other, but the 855 does feel (and sound) more powerful, especially when using the loader pushing into a dirt bank. Thanks again.



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G-MAN

07-23-2002 07:10:17




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
Guy, if your tractor is getting some hours on it - and I would consider anything over 1500 to be higher hours on a compact utility, due to the fact that they usually don't get used as much as bigger tractors, and aren't really built for 10,000 hours of service, it could be just wear in the fuel system. As the pumping elements and nozzles wear, the accuracy and timing of the fuel delivery can begin to suffer, which can lead to a small loss in power, more smoke, etc. You can everything the others suggested checked, and I would also perform a compression check while you have the nozzles out, but if everything checks out decent, there may not be much you can do. If it seems to smoke quite a bit, I would start changing the oil a little more often, as the extra soot is going to dirty up the oil more quickly.

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Clooney

07-23-2002 06:34:37




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
Guy, all those little tuggers seem to do that when they see a load increase. After the load stabilizes it should clear up some.
~Make sure the air cleaner is clean & the inner filter isn't plugged [if it has one].
~If the fuel is old you might try new fuel.
~I know my 755 blows black smoke if run wound out on the governor but will quit when the load backs off to less than full. It seems to be worse now than when new so maybe the injectors are starting to plug a little or the fuel composition has changed in the last 5 years or so.
~Maybe the difference between the 755 & 855 is the exhaust exit location, on the 755 I can see the smoke but it pretty well stays below me...

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F-I-T

07-23-2002 06:24:13




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
Guy:

I have an 855 and it only "puffs" once in a while under load. You might want to check the air cleaner, as a restriction can cause any diesel to smoke a bit more. How many hours are on the engine ? It could be time for an injector spray pattern check. You might have one or more dripping or not spraying well.

The muffler from Deere is pretty much what you're limited to, unless you fabricate another one.

My 855 is pretty good on fuel, and like I say, it only just gives out a puff when it's loaded pretty hard. I think the soot might accumulate in the muffler can for a while, then shoot out when it has a mind to. How does it start ? You might want to check the pump timing.

Frank-in-Tallahassee
70D // 855

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ChuckW

07-23-2002 04:43:06




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 Re: JD 855 Compact fuel mixture in reply to Guy Snyder, 07-23-2002 04:23:40  
I've recently restored a 755 and wondered about adjusting the pump. From the manuals there is not information and I suppose an injector repairman would have to make these. My 755 makes smoke when the governor kicks in, then clears right up. I plan on selling the 755 if you may be of interest.



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