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Mrgoodwrench 
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Joined: 03 Apr 2011
Location: CHICORA PA
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 Topic: Deere 4020 schematic
Posted: 21 hours 23 minutes ago at 7:57pm |
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Anyone out there have an actual schematic for a 12v 4020 diesel? I’m doing an injection pump conversion and have lost power. The only thing working is the headlamps. Odd thing is that I have power to 2 of the three circuit breakers but I thought the dead one was the lights…..
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There are 3 ways to do job GOOD, FAST, CHEAP. YOU MAY CHOOSE 2. If its FAST & CHEAP it won't be GOOD, if it's GOOD & CHEAP it won't be FAST, and if its GOOD & FAST it won't be CHEAP!!!!
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pirlbeck
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Joined: 01 Dec 2009
Location: West Central IA
Points: 232
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Posted: 9 hours 38 minutes ago at 7:42am |
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If this is a side console tractor there is an inline fuse under the dash cowl on the LH side. To the left of the PTO lever. If that fuse is bad you will not have any power to the key switch circuit. Also, once again if it is a side console tractor there are 2 heavy wires that connect to the alternator battery terminal, that originally both wires were crimped into one terminal end, check to make sure these 2 wires are connected.
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Mrgoodwrench
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Joined: 03 Apr 2011
Location: CHICORA PA
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Posted: 6 hours 7 minutes ago at 11:13am |
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Thanks I’ll check both of those. I think I may have shorted the fuel cut circuit while I was testing it, so a fuse makes sense.
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There are 3 ways to do job GOOD, FAST, CHEAP. YOU MAY CHOOSE 2. If its FAST & CHEAP it won't be GOOD, if it's GOOD & CHEAP it won't be FAST, and if its GOOD & FAST it won't be CHEAP!!!!
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pirlbeck
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Joined: 01 Dec 2009
Location: West Central IA
Points: 232
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Posted: 6 hours 6 minutes ago at 11:14am |
 Mrgoodwrench wrote:
Thanks I’ll check both of those. I think I may have shorted the fuel cut circuit while I was testing it, so a fuse makes sense. |
Is this a side console tractor?
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Mrgoodwrench
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Posted: 5 hours 6 minutes ago at 12:14pm |
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Yes it is
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There are 3 ways to do job GOOD, FAST, CHEAP. YOU MAY CHOOSE 2. If its FAST & CHEAP it won't be GOOD, if it's GOOD & CHEAP it won't be FAST, and if its GOOD & FAST it won't be CHEAP!!!!
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pirlbeck
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Joined: 01 Dec 2009
Location: West Central IA
Points: 232
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Posted: 4 hours 43 minutes ago at 12:37pm |
Mrgoodwrench wrote:
Yes it is |
I figured that it must be as prior to 1969 and the introduction of the side console tractors they did not have a 12 volt solenoid shut off on the injection pump, although I have seen some added when a later engine was swapped in. Also, you mention an injection pump changeover which more then likely means you are replacing the CB injection pump with the JDB pump.
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