JD 7800 3-pt hitch issue

panningbros · Nov 23, 2015

We put the snow blower on the 7800 today. When we try to lift the hitch it chatters and tries to lift and after a few seconds then suddenly lifts right up. We changed both hyd filters and the oil is up to the full mark. The remotes seem to work normally. Does anybody have any experience with this symptom?

ben brown · Nov 23, 2015

in the Differential Case there is a screen that could need to be cleaned http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet?search

Tech 7 · Nov 24, 2015

I would lean more to it being a hitch valve issue as you say the other hydraulics are working OK. The hitch light on the dash is not lit is it? I would consider doing a hitch calibration otherwise....its easy if you have the operations and tests manuals.

panningbros · Nov 24, 2015

Yes the 3-point hitch light does come on but not always. I was never sure what it came on for?

Tech 7 · Nov 24, 2015

OK if the light has been or is on means the Hitch Control Unit (HCU) is setting a code. I will try to go from memory on how to tell you how to retrieve the code: Key off, remove fuse box cover and install 10 Amp fuse in the "DIA" only port. Turn key to "on" dash will display "DIA" bump the turn signal switch up (like right turn) until "HCU" shows on dash display. Then pull the turn signal back towards you and release.bump up one more time and number(s) will start showing.Record these number(s) they are the codes. Turn key off and remove fuse.
You will need access to an operations and test manual to tell you what the codes are. The hitch position feedback sensor was a fairly common issue on these tractors. You can replace it easily but the HCU will still need to be calibrated.

jsborn · Nov 25, 2015

(quoted from post at 19:24:56 11/24/15) OK if the light has been or is on means the Hitch Control Unit (HCU) is setting a code. I will try to go from memory on how to tell you how to retrieve the code: Key off, remove fuse box cover and install 10 Amp fuse in the "DIA" only port. Turn key to "on" dash will display "DIA" bump the turn signal switch up (like right turn) until "HCU" shows on dash display. Then pull the turn signal back towards you and release.bump up one more time and number(s) will start showing.Record these number(s) they are the codes. Turn key off and remove fuse.
You will need access to an operations and test manual to tell you what the codes are. The hitch position feedback sensor was a fairly common issue on these tractors. You can replace it easily but the HCU will still need to be calibrated.

First off Let me say I am just being a Smart A but while reading this i could not help but think of setting my VCR and the instructions for setting a digital watch. My question is while doing this do you have to wear one shoe and stand on your head facing east with one eye closed ?? LOL

I just couldn't resist

Tech 7 · Nov 25, 2015

Yes I know it sounds complicated but after doing a few hundred it becomes automatic. I will admit the electronic side of the business was not my favourite.

panningbros · Nov 25, 2015

Thanks for the info. Makes sense to me. We will have to take it someplace and have it checked out.

JD 7800 3-pt hitch issue

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