JD 4320 starting issue

[larryanderson]

I just got a 5500 hour original 4320 it runs and operates excellent.The problem is it starts harder than most .The man I got it from wants to take care of the problem as it has not always been that way.I need to know where to start .I know theres some really sharp minds on here and would like your input .THANKS!

 

[Bill Lisbon]

Do the easy things first, check connections, wires, gounds, then check batterys, if this all checks out good, remove starter and have it checked by a good automotive electrical shop.

 

[4020_1966]

After that, have injectors, compression and injector pump checked.

 

[lonzo]

I put 2 12volt batteries in then i have two pos cables going to the starter and 2 grounds,kind like one batter backing up the other, i know some say this won't work then how come combins with this same motor use 2 12's in stead of 2 6's and they started alright? I want the engin to start now not run down batteries heat cable ends smoke the soleinod, never replaced a starter becsuse the batteries were too hot but sure have replace starters because the batteries were half dead, do not use automotive cables they are not big enough, have JD or somebody else make them for you.

 

[JD Seller]

Check the battery cables out real close. I had a late style 4020 two weeks ago that cranked slow and started hard. The cross over positive cable was corroded inside of the insulation and made the resistant go sky high. Replace the cable starts fine now.

 

[buickanddeere]

What is the voltage measured between the starter's cast body and the bolt to which the batteyr calbe is clamped under?
Have you took 10 minutes and installed the $15 pump destroker?

 

[4430jd]

How is it starting hard? Slow Cranking,or not getting fuel right away?

 

[Tx Jim]

Larry
Does moving steering wheel rapidly back & forth help? If so then a pump de-stroker screw as b&d mentioned will help.

Checking inj pump timing because the wear in timing gears can let pump get retarded timing. Also checking injectors as 4020_1966 mentioned

As others stated good battery cables & batteries are a must have.

I also agree with Lonzo that 2 12V are better than 2 6V batteries

 

[larryanderson]

Tractor seems to have plenty of cranking power.I will install destrocker kit.I dont like to use starting fluid but a very small amount gets her going.After it has ran once it starts normally.The tractor has had some recent pump work and seller was going to have him call me to see what was done.He was going to check it out but truck picked it up a few days early.I have had a few 4320s and they all seem to have different personalitys as to starting.Thanks

 

[Gene-WI]

I'm not an expert by any means but it seems I heard that depending on the brand of injection pump you have, the rack in the pump needs resetting after shutting tractor down, this was accomplished by opening throttle wide open and then closing it, worth a try. Gene

 

[4430jd]

I am not 100% on this but there is a check valve on the injector pump that keeps it from losing fuel and it will start hard after setting, As you said they all have different ways of making you scratch your head, we had one do what you describe a long time ago I'll ask what it was for sure,

 

[Dean Barker]

I"ve two 4320"s. As far as starting, one might not start below 50 degrees and the other one below 60 degrees. I bought a hydraulic pump destroke kit for the worse one, but haven"t installed it yet. I guess the double reduction starters help as well.

 

[JD4455]

a common starting problem with the 20 series tractors are more then just starters, batterys and volts. The high pressure hydralic pump is ran by a belt on the crank shaft. If the destroker valve on the hydraluic pump is shot then the pressure is still in the lines. that could also happen from the pump going to hell. With high pressure still in the lines, and the starter trying to turn over the cam shaft, the crank, the pistons, the everything, having to turn a pump with pressure on it will bog it down. So to find out if it is the problem, while starting your tractor crank the wheels everyway you can, which will take the pressure off the lines and the tractor should start right up. If it is the problem, replace the destroker valve, and or the hydraulic pump. This happend to my 4320, and my brother told me that it was possibly the problem on it, he knew because he went through John Deere tech in Mississippi. Common problem, i tell ya.

 

[Tim in Montana]

(quoted from post at 09:58:47 01/07/11) a common starting problem with the 20 series tractors are more then just starters, batterys and volts. The high pressure hydralic pump is ran by a belt on the crank shaft. This happend to my 4320, and my brother told me that it was possibly the problem on it, he knew because he went through John Deere tech in Mississippi. Common problem, i tell ya.

I have a 71 4320 that is hard to start if it is below 40 degrees. But I think the belt that turns the hydraulic pump on mine is missing, causing the tractor to be hard to steer when the engine is not running. How do I put the belt on? I can't find a belt diagram for it. Maybe you can take a picture of the belt layout on your tractor or have you tech brother demonstrate the technique with a video.

 

[AWK]

The hyd pump is not belt driven. It is driven off the crankshaft. The belt is there for the fan, water pump, and alt. It would be worth your while to put the destroke screw in. You can also help your batteries and starter by using a block heater.