JD 4600 HST PTO Problem

[kabeman]

Hi everyone!
This is my first post, hopefully it is in the right place.

I have a 2000 JD 4600 HST and the PTO will not engage.
I have the Technical manual and have followed the test procedures for the "electrical" portion of the PTO system.
Everything on the electrical side seems to be functioning correctly ie: PTO solenoid has 9 ohms of resistence between leads, no continuity between anyone lead and ground, 12v at the solenoid when PTO switch is on.
This seems to point to a hydraulic problem. In the manual it mentions a "mesh" screen in the suction line. This is my question: where is the suction line screen?

Thank you in advance for your help/advice

PS: The tractor has a SCV for the FEL installed
only 510 hrs on tractor
no mid-mount PTO

 

[kennyd]

Welcome to TBN

The screen should be near the hydraulic filter, and should be cleaned when the hydraulic fluid is changed. Some models also has a inline filter on a hydraulic tube at the rear of the tractor over the tranny.

Have you owned the machine since new?

 

[shot_gun]

Do you have any other hyd. functions? ie power steering, three point hitch ect.

 

[kabeman]

Yes I have owned it since it was new.
There is a small cylinder inline at the rear hyd. outlets for the backhoe attachment. What is the recommended cleaning procedure?

 

[kabeman]

Do you have any other hyd. functions? ie power steering, three point hitch ect.

Yes, all other hydraulics work fine, steering, 3-point hitch and FEL

 

[kennyd]

Have you done the maintenance on it? You never changed the fluid and cleaned the screen? Your owners manual should describe the procedure. I am not sure how to clean the inline filter, but the main screen require emptying the tranny.

 

[kabeman]

Have you done the maintenance on it? You never changed the fluid and cleaned the screen? Your owners manual should describe the procedure. I am not sure how to clean the inline filter, but the main screen require emptying the tranny.

No the dealer has done the only Hyd. maintenance (Hyd. fluid and filter change) when it was in for another issue 200? hrs ago.
Unfortunately during my last move, into a new place, the owners manual was lost. There is only 500+ hrs on it.

Thank you for your input. I will be changing the fluid, filter and cleaning the screen, but wanted to find out what the problem "most likely" was so that I didn't change the fluid, etc. and then have to take it in to the dealer only for them to change it again during their "fix"

Also, just fyi the PTO output shaft does spin freely by hand with no apparent wobble.

 

[mfreund]

This may be too easy but did you check the ground from the control panel(my manual shows 050k black). I think you still have an electrical problem because of all the other hydraulic options seem to work fine. I used the diagram 4-163 to try to follow the circuit from battery to ground. I hope this helps and remember it is worth what you paid for it!!!!!

 

[kabeman]

This may be too easy but did you check the ground from the control panel(my manual shows 050k black). I think you still have an electrical problem because of all the other hydraulic options seem to work fine. I used the diagram 4-163 to try to follow the circuit from battery to ground. I hope this helps and remember it is worth what you paid for it!!!!!

I have to agree with you that it is most likely an electrical issue. I will look into the ground side as soon as time allows. (Plus it has been raining up here almost non-stop!)

 

[Mighty Dodge]

You can download a manual here John Deere Ag - New Equipment: Technical Publications - Equipment List

M.D.

 

[kabeman]

**** Update ****

The electrical checks out 100% I followed the procedures in the tech manual to the letter.

A couple of things that I have noticed:

When raising the FEL the 3-point hitch will not operate and visa-versa.
When the engine is not on I can rotate the PTO shaft by hand
When the engine is on and PTO switch is either on/off I cannot rotate the PTO shaft at all.

Any one with ideas on what to check next?

 

[prosperity]

Not being familiar with the 4600 .....

Does it have both a mid PTO and rear PTO?

The reason I ask, is that on my 2520, there is a selector lever for engaging just the front PTO, just the rear PTO, or both.

If you have this type, have you tried the mid and/or rear PTO separately?

 

[kabeman]

Not being familiar with the 4600 .....

Does it have both a mid PTO and rear PTO?

The reason I ask, is that on my 2520, there is a selector lever for engaging just the front PTO, just the rear PTO, or both.

If you have this type, have you tried the mid and/or rear PTO separately?

No I have only the rear PTO.
Any other thoughts? Do you have a FEL on your tractor?

 

[kabeman]

Are there any HST Techs out there that could help me with this?
I don't mind going to the dealer but if it is something I can do myself...I'm not saying I want to or even could take apart a HST, just looking for an informed opinion on what I should be looking for.

 

[kabeman]

Hey everyone!

Just to update you. I took the tractor into the dealer and the problem turned out to be corrosion of the PTO solenoid pin, due to moisture in the fluid.
The Tech. cleaned and reinstalled, (charged me two hours, fair I think) and all is fixed.

I'd like to say thank you to all who responded.

 

[mfreund]

I think a Tech is the only one who would have known to look there for problems. I am glad it is working, it is frustrating to have a broken tractor!!!!!

 

[Crabgrass]

I just wanted to thank kabeman for following up his post with what he found out. It's very nice when "problem" threads have the solution at the end.