JD 8440 - oil leak in clutch compartment - Page 2 - The Combine Forum
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post #11 of 15 (permalink) Old 03-20-2014, 10:54 AM
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If you crawl under the front of the tractor and look up at the bottom of the pump you will see the destroke screw screw it in to destoke the pump for starting and screw it back out when you have it going. There is an electric destroke on the 50 series could probably retrofit it to the 40 series. We have an 8640 that still has the maunual destroke we use it for plowing snow and she starts up no problem @ -35 as long as shes been plugged in all night so you might have another issue if its hard starting

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post #12 of 15 (permalink) Old 03-20-2014, 12:46 PM
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Check with an amp clamp to verify you are getting full battery power to the starter. Batteries are away from the starter in front of the rad, so a few feet of cable involved. Make sure it is all large cable, should be 00 size I believe on those, and also make sure there is good connections, including where the battery ends are crimped or soldered to the cables. Another place to have bad connection is right at solenoid. And a bad solenoid can cause the same if it is burnt inside.

Also make sure the ground cables are connected properly and have good contact to bare steel and not on top of paint.

Unless you are in cold climate, shouldn't have an issue with the main pump causing drag. Some will always push the seat height lever down to help relieve load on starter if it needs to be cranked any length of time.

There is also a possibility of a timing issue with the fuel pump which can cause this. I believe you said this thing had recently had a lot of work done to it.

Tough to say for sure what it exactly is without being there...but those are some ideas to work from


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post #13 of 15 (permalink) Old 04-03-2014, 08:49 AM Thread Starter
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Thanks guys. It looks like when weather conditions are better (spring-time now here) - JD is starting up much much faster.
Just one more question - transmition oil - should we buy it directly from official John Deere, or any other provider is acceptable? Do you know the coding of that oil?
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post #14 of 15 (permalink) Old 04-03-2014, 10:22 AM
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No need to buy it from Deere, you just get to pay dearly for the Deere pails

Any transmission hydraulic fluid that has the J20C specification listed is satisfactory.

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post #15 of 15 (permalink) Old 05-24-2019, 05:48 PM
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I have a 8440 that the clutch housing is over filling with hyd oil and can't figure out why? Transfer pump is working, sump screen is clean all my hyd pressures are good and lube pressure is also good. Can anyone help me with this?
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