Jd 3020 Knock

I have a Jd 3020, gas, powershift. I am looking to sell it but it sounds like it is knocking at higher rpms. Therefore, I have a few questions. About how much am I looking at to replace the engine with a used one? Rebuild it? Or could I sell it as is for a fair price? Let me know your thoughts or other ideas. I can provide more info as needed.

Have the bushings in the front hydraulic drive coupler been replaced? They will sound like a knock.

No they have not. Is there a way to check this or just replace them and see if it goes away?

Welcome to YT
Ditto on checking frt hyd pump drive coupler bushings.

Replacement engines for JD 3010/3020 are almost as scarce as "hen's teeth"

You should be able to wiggle the coupler and see the slop, or there are just 2, 3/8 bolts holding it together. there are four bushings that are $2.50 each for a total of $10.00.

Does this tractor have collector value ?

Thanks for the info. I will check this out here shortly.

I believe it does. I can send you pictures and any other information you would like.

I will agree with checking out the hydraulic coupler bushings first. They are cheap and easy to replace.

Finding a good replacement engine would be difficult. They would more than likely be in the same shape as yours.

Another thing you need to consider is the engine balancer in the oil pan. The 3020 has a gear in the middle of the crankshaft that drives this balancer. IF the bearings are out of this balance it will make a knocking sound too. The bad news here is yours is a gas motor. The balancer gears for the gas motors are no longer available from JD. So I would check the hydraulic coupler and if they are not bad then I would drop the oil pan and check the balancer out. Do so before running it much longer. Most of the time if caught soon enough the balancer just needs bearing to be rebuilt.

Now as to the value of a JD 3020 GAS. The power shift makes it a little more marketable but not a lot. There where fewer made but still enough that they are not supper collectable. You have not told us the year of the tractor so here is two prices. An early model JD 3020 gas PS will be in the $4500-5500 range in good condition, no knocks. A late model one will be more in the $6500-7500 range. Now, good paint and newer tires will increase both values. Your tractor is a collector market tractor. It being a gas models is a major draw back to some one wanting to use it as a regular tractor.

So in summery: IF you just have a bad hydraulic couple issue than your good to go relatively economically. IF you have balancer problem then the cost will be higher. Rebuilding the balance can get costly if the housing has to be bored and bushing installed to repair the bearing seats. You can easily get into the $1500-2000 range if the balancer is in bad shape. IF it is just bearings your in the $200-300 range. The total value of the tractor will limit your ability to do major repairs and make any money. The difference in the value of a gas verses a diesel can easily be 50%. Even at the lower prices a gas model is usually not a hot seller either.

It's a 1966. I checked the bushings in the front hydraulic drive coupler and there is zero slop.

I would have a used engine. I have parted out several 3020. We are located in southwest WI post back if interested. Tom

Thank you for the information. I have checked the front hydraulic drive coupler bushings and there is no slop. From the information provided it leaves me to believe that it is either the balancer gear you described or something larger.

What would you value the 1966 3020 gas PS in this condition granted we do no know the exact problem?