New to me JD 620 PTO/3 pt issues

[offroad23]

First off thanks for allowing me to join the group.

I recently purchased a 1958 JD 620 that has been sitting for several years. Previous owner passed away and it has been just sitting in the shed since then. When I got it a 3 pt brush hog was still installed on the back so I know the PTO and 3 pt had worked when it was parked.

The intake manifold was in sad shape so I replaced both it and the exhaust manifold as well as cleaned/rebuilt the carb and got it to run over the weekend.

3 PT: It does not move. I have verified the pump is turned ON and moved the 3 pt control lever and nothing happens. Not sure what else I need to do here. Hydraulic oil level appears okay and I thought as the tractor ran it seemed to at least warm up, it was no longer 40F like it was outside.

PTO: Only way I am able to turn on PTO is to shut the tractor off and put the PTO lever in proper position and then restart tractor and then the PTO runs all the time, the Engage/Disengage lever does not appear to do anything. I have read where the trans oil leaks into the PTO area which can cause issues so I will look at this. I also read in the manual where the clutch can be adjusted, not sure I understand the procedure, but plan to look into that further this week.

Can someone walk me thru the items I should check and proper methods to turning both these items ON?

My plan is to get the fluids all changed here in the coming weeks, but wanted to see what opportunities or things I need to fix first before doing that so I know what I have.

This post was edited by offroad23 on 12/11/2023 at 11:24 am.

 

[Hayfarmer]

May sound like a broken record but, first thing you need to buy is an operator's manual. It will save you money down the road and necessary when checking all those fluid levels.

 

[matthies]

To verify the pump is working, move the lever for the remote hydraulics, if it squeals then the pump is working, no squeal then shut tractor down and disengage and reengage the pump. Might not have it
engaged, as sometimes the starter has to be bumped to engage the gears. The pto, drain and smell it, if it smells like 80-90, that could be your problem. Better yet see how much comes out or if it ever
quits draining to see have bad the seal is.

 

[PJH]

If your remote hydraulics are set for one-way operation and your remote hydraulic lever is pushed forward, your three point will not raise. The remote lever needs to be in the center position for the three point to work. As someone else pointed out - move the remote lever backward and the relief valve should squeal if the pump is working. The relief valve will not squeal if you move the remote lever to the forward position if the remote hydraulics are set for one-way operation. Sometimes the remote hydraulics are set for one-way operation and the operator leaves the lever forward so the remote cylinder will ''float''. I hope that is all that is wrong.

 

[PJH]

About your PTO - the proper way to turn the PTO gear lever to the run position is with the engine shut off. If you have the unusual transmission driven PTO you can shift it into gear with the belt pulley stopped. I think most PTOs of that era were engine driven and required the engine to be off for engagement. My parts book shows the transmission driven PTO, but I've never seen one.

I have always heard that the PTO clutch does not like gear lube. It seems like the PTO brake is the first part to suffer, at least in my experience. My JD 50 ran a long time with gear lube leaking into the PTO clutch, in fact, it never did quit working before I rebuilt the clutch. I presently have a JD 620 that mixes gear lube into the PTO clutch. It's not an ideal situation, but the PTO is used mostly on a hay tedder, with occasionally some light bushhog work. Undesirable, but it will work until it doesn't, then it's time for a rebuild.

 

[offroad23]

Thanks for the feedback. I do have an Operators Manual, Service Manual and Parts Manual. They help, but some of the pictures and diagrams don't specifically show everything really well which is why I am asking for additional clarification. I messed with this some more yesterday and the PTO works fine, I can now Engage/Disengage it with the foot lever, didn't change anything, maybe with it spinning the other day it helped loosen something up inside the clutch to make it work since it had been sitting. It doesn't always want to disengage or feel like it goes into a notch so I will look at clutch adjustment. The oil leaking around the PTO output shaft is lighter weight, definitely not 80/90 so I may be good on that side. Will be draining it to confirm this.

I did some additional tests on the 3 pt and the hydraulic remote never does make the pump squeal in the forward or rear position so maybe the pump is not being engaged, will look into that more.

Ran into an issue where my water separator keeps plugging up with gunk in the upper part (not the bowl) where gas will no longer flow and then the tractor won't run. Did that to us twice yesterday and the only way to fix was to pull the separator apart and clean the gunk out of the spring in the mid portion. My bowl gasket then started leaking and now need to find another gasket.

Attempted to bypass separator and use a bottle direct to carb and run it with the separator disconnected and and engine oil lines off it and that was a mistake the one side shot oil everywhere, I was under the impression that both lines were vacuum lines, not that oil flowed thru the separator from one line to the other to make the gas flow for auto shutoff.

 

[offroad23]

I did some more fiddling with the hydraulic pump I don't think it is actually engaging, is there an easy way to verify this?

 

[PJH]

Sometimes you have to do like Matt mentioned - twist the pump off/on lever and while twisting, bump the starter. That will let the gears mesh. After you have the pump engaged you should be able to move the remote hydraulic lever BACK and make the relief valve squeal. If I remember correctly, the word ''on'' on the pump engagement lever will be pointing straight up when it is properly engaged. I have never had to prime the hydraulic pump on a 2 cylinder Deere. Keep us posted on what you find out.

 

[offroad23]

Well got this figured out on 3 pt. Hydraulic pump was functioning and engaged properly all along. First off I pressed on the ball of each remote to verify it at least had oil, still nothing. Then took plug and installed in one of the remotes and then could hear hydraulic pump squeel when lever was moved and 3 pt was now fuctional. Removed plug and 3 pt still works. Something must of been sticky or plugged, all works fine now.

 

[Paul_IN]

Glad you have it working and appreciate that you reported back!

 

[Pete in MD]

First off thanks for allowing me to join the group.

I recently purchased a 1958 JD 620 that has been sitting for several years. Previous owner passed away and it has been just sitting in the shed since then. When I got it a 3 pt brush hog was still installed on the back so I know the PTO and 3 pt had worked when it was parked.

The intake manifold was in sad shape so I replaced both it and the exhaust manifold as well as cleaned/rebuilt the carb and got it to run over the weekend.

3 PT: It does not move. I have verified the pump is turned ON and moved the 3 pt control lever and nothing happens. Not sure what else I need to do here. Hydraulic oil level appears okay and I thought as the tractor ran it seemed to at least warm up, it was no longer 40F like it was outside.

PTO: Only way I am able to turn on PTO is to shut the tractor off and put the PTO lever in proper position and then restart tractor and then the PTO runs all the time, the Engage/Disengage lever does not appear to do anything. I have read where the trans oil leaks into the PTO area which can cause issues so I will look at this. I also read in the manual where the clutch can be adjusted, not sure I understand the procedure, but plan to look into that further this week.

Can someone walk me thru the items I should check and proper methods to turning both these items ON?

My plan is to get the fluids all changed here in the coming weeks, but wanted to see what opportunities or things I need to fix first before doing that so I know what I have.

This post was edited by offroad23 on 12/11/2023 at 11:24 am.

I agree with PJH. The pto lever must be engaged with the the engine off.

,,

 

[offroad23]

When we dropped all the fluids over the last week I took the time to adjust the PTO clutch and I can barely get the "check wire" that protrudes out the rear of the housing to barely go past flush (book calls for like a divot and ridge to be exposed) before the PTO was to hard to engage so it looks like at some point I will need to put a clutch in it. It does have a distinct engage, disengage now when pedal is pressed and seems to stay engaged or disengaged alot better. Plan on testing the PTO on our manure spreader later this week if weather cooperates to see how it functions with a load.