I work for a trucking company that also has farm tractors. They have a John Deere 4020 that I just replaced the fuel injector pump in Augist 2011. I can give tips on how to time these.
Anyway … The pawn just towed him today saying he doesn’t move when he’s hot. I have checked the hydraulic fluid and it was very low. The left rear wheel was solidly locked and the right rear wheel spun freely (I had it on jacks). 10 gallons later … yes 10 gallons of hydraulic oil then the left wheel was finally released. I filled it up to the back plug line in the therear case. (I guess that’s where the fill line is). But now it slips a lot when you try to move. You have to keep it in low gears and rev the engine and it finally starts to move. It does not move in gears higher than 5th. I have drained some oil from the rear case and I have small chips.
I have no idea how this back box works. But if it was a truck I would swear the clutch is slipping. But since the rear box has run out of oil … I guess since I don’t know how much it retains in the first place … what would be damaged? I see others talking about a power change on the JD 4400 series, I’m not sure what it is either. Is a 4020 considered to have a power shift too?
When it gets hot it doesn’t go anywhere. I have seen in another post that someone had a JD 4400 series that has filters on the rear. Does this also have filters? What exactly drives the rear wheels, is it the gears, the clutches?
So is this bad news for my company and what would have happened to run the rear end so low on oil that it will barely move? BTW, the farmer never complained about any oil leak, but we have had issues with sabatoge. I have to rebuild a Duetz air cooled pump motor no thanks to sabatoge.
I know I should dedicate myself to working on trucks, but I’m also stuck fixing farm equipment. I have to learn sometime.
Towing a JD 4020 without putting any type of trans (syncro-range or powershift) in “TOW” is sure death for the trans.
What trans do you have? Does the pattern of change look like a “J” or a puzzle? For your information, the transmission / hydraulic dipstick should be next to the right heel of the operator seated in the seat. The correct way to measure the oil level is when the knurled nut is at the top of the threaded area. Syncro transmissions have one filter and PS have two filters, both types of filters are located under the LH battery.
Thanks for the illustration. When I first received the tractor, it was not moving. After raising the rear, only the right wheel turned. I thought the brake was locked on the left wheel. But I checked the fluid level and found it was low. After adding the oil I started it up and started it. Hitting the right brake to make that wheel stop did not cause the left wheel to move at first. I had to keep getting the clutch in and out and finally the left wheel was moving little by little. He finally broke free.
I think you are right that the spider is damaged, but I never realized it had a rear end like a truck. When I first had the tractor the right wheel was released by hand and did not cause the left wheel to hook at all.
On trucks, a bad spider can be checked by lifting the rear end. So you spin one wheel and the other wheel should spin in reverse. Get a second person and ask them to hold the opposite wheel. Then you must not be moving your wheel at all. If you can still move your wheel with the second person holding the opposite wheel, the spider is damaged.
When I made this test, the right wheel turned by hand without any effect on the left wheel.After filling it with liquid and release it, the spider finally began to function as it should.Now both wheels engage.But I guess the question of the day is too little and too late.Tomorrow I plan to take the filter from the transmission.