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Tractor Talk Discussion Forum

1969 john deere 4020 diesel

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BRIAN NEES

04-20-2008 15:25:31




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i have a 1969 4020 diesel i am wanting to know if u need batterys on it hooked up to pull start it can any one help me plz




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730 virgil

04-20-2008 19:58:52




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  
my cousin tried to pull start his 4020. he got a new 4020 the next day as he screwed his up bad.



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Bob

04-20-2008 22:11:48




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 Re: 1969 john deere 4020 diesel in reply to 730 virgil, 04-20-2008 19:58:52  
Now tell us the "rest of the story"!

He must have TOWED it in NEUTRAL, as opposed to "pull starting" it!



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Gerald J.

04-20-2008 18:19:32




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  
Neither transmission pull starts. The PS has to have hydraulic pressure to operate the clutches, but it pulled not in the tow position the lack of lubrication oil from the hydraulic pump will destroy parts.

The SR transmission doesn't need oil to operate except for lubrication and it doesn't take much towing to sieze the gears to the top shaft that is only lubricated by oil from the pump that turns when the engine is running.

Far better to fix the starter and batteries and start it normally. Can save several thousand bucks of transmission repair.

Gerald J.

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Bob

04-20-2008 20:00:30




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 Re: 1969 john deere 4020 diesel in reply to Gerald J., 04-20-2008 18:19:32  
Gerald,

You can "pull start" the synchro version 'til hell freezes over with no tranny lube problems 'cause when pull starting the upper tranny shaft and therefore the transmission oil pump are turning.

It's TOWING, with the engine STOPPED and the tranny in NEUTRAL that "kills" the upper tranny shaft/gears from lack of lube, 'cause under that condition, the tranny pump is not operating!

Think about it!

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M w J

04-20-2008 19:45:03




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 Re: 1969 john deere 4020 diesel in reply to Gerald J., 04-20-2008 18:19:32  
If the Syncro tractor is in gear and the motor is turning over It should be pumping oil. Where people get in big trouble is towing when in when not in gear and not in TOW. If the engine is turning over and the pumps are working you could pull it all day and not hurt a thing..... Mike



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SMinWi

04-20-2008 17:43:14




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  

Do not pull start it if it has a power shift transmission!!



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Bob

04-20-2008 17:52:39




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 You mean don't TRY to pull-start a powershift! in reply to SMinWi, 04-20-2008 17:43:14  
You mean don't TRY to pull-start a powershift!



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francih

04-20-2008 17:33:41




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  
be careful there is a shaft in the tramision that needs oil ot willlock up



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Billy NY

04-20-2008 15:49:13




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  
Know absolutely nothing about 4020's, but if it's not a powershift, one would think putting it in gear, turn the throttle up a little, towing it with something,it should fire up being an older diesel without electronics, running on compression, no spark needed, nor batteries hooked up, don't quote me and I do stand to be corrected, also use care, throttle it up a little and be prepared to shut it down quickly if necessary, kind of a 2 person job.

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buickanddeere

04-20-2008 18:18:39




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 Re: 1969 john deere 4020 diesel in reply to Billy NY, 04-20-2008 15:49:13  
Call this number before you hurt yourself, somebody else or wreck your tractor. 1-800-522-7448.



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M w J

04-20-2008 15:43:52




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 Re: 1969 john deere 4020 diesel in reply to BRIAN NEES, 04-20-2008 15:25:31  
needs 12 volts to the electric shut off on the injection pump but that could be hot wired if for some reason you don't want to power the whole electrical system



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