Illustratie van:
  1. Forum
    2. ›
  2. Het werken met / aan een tractor

Fendt 920 - Wont start, need help !

Hey guys!

So the 920 wont start, when I turn on the ignition nothing happens, if i turn it on and of a couple of times sometimes it light up. But when i turn the key all the way it goes black again. Seems like there is a bad connection or something? Are there any know problems? Both of the batteries are 3 years old and when i measured the power on them both had 12,9V. The start relay is also 3 years old and had no moist or water inside and looked as it did when it was new. I should mention that this happend after i had washed the tractor, but there was no unusual wash. It was only on the outside panels and the rims.
Could it be the ignition lock?

Hope there are someone who can help me!

Regard Erik

Deel dit topic

Laatste

Reacties

Fast Eddy
Are the clamps on the batteries clean? And are they not losen up?
Erik307
@Fast Eddy Yep they are all good, the parking lights on the tractor work and so does the radio so there is power there. I also measured the power on the startermotor and there it was 12,7V.
CHALLENGERfan
Sounds like your iginition lock need to be replaced, like you thought. That it happens after washing is just coinfidence I think. However, maybe it could be a computer unit somewhere, but I don't where those are placed. Maybe @Fendt926Driver can tell you more
Erik307
@CHALLENGERfan Yeah I was thinking it was just coinfidence also, Since i wasnt washing under it or anything. I see my key is well used and the ignition lock feels worn compared to the one on my dads 716.
Wimsumar
Hi Erik:

Quote Reactie van @Erik307:
ignition lock feels worn

Try to lubricate/clean the ignition lock with contact spray (or even W.D.-40 rust remover spray).
(Replace the lock as soon as possible, if it caused the problem).

B.T.W.: All other electrical components are doing well?
Erik307
@Wimsumar all components that work without the iginiton works. I measured the iginiton lock and it gets 12,2v so there is power comming in to it at least
Wimsumar
Hi Erik:

Quote Reactie van @Erik307:
12,2 V

You measured 12.9Volts at batterie. Now there is only 12,2 left at ignitition lock. I think batterie clamps have bad connection at batterie (or cable(s) in clamp(s) ).
Erik307
@Wimsumar checked the clamps, the battery poles look nice and clean and so does the clamps. Thighten them good again but didnt help. I opened up the iginiton lock and it was a little dirty inside so i cleaned it. Now the dash lights up, but if i just barely touch the key i turns on and of.
Erik307
@Wimsumar update: measured the battery again now, now it has 12,4 and there is 12,4 comming in to the iginiton lock. When it was 12,9 the tractor had been running 5 minutes before.
Fendt926Driver
Maybe the switch at the clutch is dead. You need to pull down the clutch to start the tractor. So connect the wire from the switch to each other and try again
Erik307
@Fendt926Driver The dashboard dosent light up at all, i think it would light up even though the clutch switch is dead or? But i will check!
Erik307
@Fendt926Driver is this the magnetic switch on the side of the pedal?
Favorit614
Check the cabel of the batery to the cab .
There's a 1 pole connector , in that bad contact by tray corrosion.
That is , the main current supply for the cab.

(Sorry for the bad englisch google translate)
Favorit614
And check the fuse, 40 amp
Erik307
@Favorit614 where can i find this cable?
Erik307
@Favorit614 is the fuse in the fusebox in the cab? Dont find any 40a fuses in the cab.
Erik307
@Wimsumar @Fendt926Driver @Favorit614 There is something weird going on now. WIth the igniton off i measure 12,4 V on the ignition lock. As soon as i turn on the ignition the voltage drops to 0 and then start to climb until it reaches 7v, at that point there is enough power to the dashboard so it lights up but thats about it. So it seems like either the power is going somewhere wrong or that there is not enough comming in.
Wimsumar
Hi Erik:

Quote Reactie van @Erik307:
there is not enough comming in.

Very weird indeed.
Make connection to the 716's batteries (jumper cables). Your 920's batterie(s) might be "dead".

Also check earth cable (at tractor's side).

Is there a batterie safety switch at such tractor? Maybe it is corroded.
Erik307
@Wimsumar Yep i will try that
Favorit614
@Erik307 may be the batery switch relais?
@Fendt926Driver kan maybe tel where the cables komming to the cab.
I had the same problem , whit the 1 pole conector in front of the cab from mij 818.
Erik307
@Favorit614 Is this the cable that comes from one of the batteries and goes under the cab? Im not good at electrical stuff, it's a big pain in the a**
Puma cvx power
I had the same problem a view weeks ago with a combine. When you measure the battery the voltage is normal. When you turn on the ignition the voltage fall down to under 10 volts. I put a new battery and the problem was over.
Erik307
@Puma cvx power and this just suddenly happend? It was so strange because i was driving the tractor 10 minutes before, but things brake sometimes i guess. I will try with startercabels from the 7 16 later today and see
+2
erik9831
@Erik307 Thats normal to happen ...

Cars do have the same problem, start perfect and you drive around with it for hours. Once you turn off the ignition, that battery is dead.

In the battery are cell's, sometimes one of this cell's brakes and the battery is gone.

I hope that this is your problem.
Erik307
@erik9831 i hope that too. But the tractor has 2 batteries, is it likely that both brake or if one of them is broken the other one dosent have enough power to start the tractor?
Wimsumar
Hi Erik307:

Quote Reactie van @Erik307:
the other one dosent have enough power to start the tractor?

During summer, tractor would start if one of the two batteries is dead, but the "good" one will not last very long doing this job. So, now I think both batteries are Resting in Peace.
Probably you already noticed a less powerful start last times.
Fendt926Driver
@Wimsumar wrong.
the tractor starts at 24 volt and all other stuff runs at 12 volt.
930triplemaaier
@Fendt926Driver see my post below
Wimsumar
Beste Fendt926Driver:

Quote Reactie van @Fendt926Driver:
the tractor starts at 24 volt

I very much doubt if that's true. There is no advantage of a 24 Volt starter on a tractor.
930triplemaaier
@Wimsumar a 24volt starter is more compact and has les wear on the carbon brushes because higher voltage means lower resistanse/heat
Wimsumar
Beste Triplemaaier930:

Quote Reactie van @930triplemaaier:
more compact

That's a small advantage. 😉

But I am convinced a Fendt 920 has a 24 Volt starter. According website below:

kramp.com/shop-nl/nl/…
MASSEY-MOOI
Start relai?
930triplemaaier
You have probably a bad battery

is the starter not 24 volts? i know from the newer models that they have a 24volt starter and 2 batterys al the stuf on the tractor is 12 volts
Normaly the batterys are paralel connected so you have 12 volts but when you want to start there is one batterys disconnected and reconnect it in serie with a heavy relais to deliver 24 volts for the starter after starting the battery are reconnected paralel

i had the same problem with a 930 and i have a bad battery
Erik307
@930triplemaaier so if i disconect the bad one the tractor will start? Or do i need 2 working batteries to make it work? I think it is strange that the dashboard dosent light up when i turn the iginiton on if everything else than the starter is 12v? Was it like that on you tractor also?
930triplemaaier
@Erik307 all the elektronics is 12 volts so then 1 battery is good enough but when you want to start you need the second battery for the 24 volt starter
Erik307
@930triplemaaier yep, so even if one battery is broken i should still get the iginiton on and the dashboard should light up right?
930triplemaaier
@Erik307if the bad battery nod drains the other battery yes
i read back your story it could also be the relay that switch the battery from parralel to serie and back
Erik307
@930triplemaaier do you know where that relay is? I can see the startrelay but i cant se any fuses on that one. Is there a separate one that makes it 24v? If you know what i mean
930triplemaaier
@Erik307 yes there is seperate heavy relay that makes it 24 volts that relay should be somewhere close by the batterys.
Erik307
@930triplemaaier okay, thanks for the help so far! I will check more tomorrow and try to locate that heavy relay
chucky5o
Sometimes the lights will light up?, battery dead?, the battery is a strange thinks when it's dead. Sometimes you got power and sometimes nothing..
Erik307
@chucky5o tested both batteries with a battery tester and they where ok, the park lights and the emergency blinker work. But all things that need the ignition to be on to work, do no work. Seems like ther is a short circut or something, so all the power goes to the wrong place
chucky5o
@Erik307 frist check a of your fuses. If they are good, a v4 check is allways the best solution. Start testing at the battery, +- has to be 12v. Test the cable that runs to you iginiton switch, both positive! +/+ has to be 0v. iginiton switch 30 and 15 has to be 0v otherwise its broke. Last one, from 15 on your iginiton switch to negative on your battery... English is not verry good, hope you understand it...!😂😂
Erik307
@chucky5o okay, i will try this tomorrow, thanks 😀
Erik307
@chucky5o with the ignition off 30 has 12,4 v, same as the battery and 15 has 0v. With the ignition on 30 has 0,12v and so does 15. I borrowed the ignition lock from my dads 716 but i didnt work. Not sure if they are exactly the same inside though they look the same on the outside. Where does the wire nr 15 go to?
chucky5o
@Erik307 there is an wire goes to your battery, 15 from ignition goes to your starter. Check that wire.
jelle930
Kolla säkringen som sitter vid batteriet en svart låda med två stuk 80 amper säkringar brukar vinnas två rersv. händer oss också ibland på 930 och 916.
Erik307
@jelle930 Har sjekket de, begge to ser helt fine ut. Hele releet ble byttet for ca 3 år siden så alt ser fint ut der. Vanskelig med elektriske feil..
Tom VB
@Erik307
Swedish or danish?
+2
Erik307
@Tom VB Norwegian 😀
+1
Fendt926Driver
@Erik307 tractorfan.nor
Erik307
@Fendt926Driver no the same tractor community in norway as you guys have, and people are not that so helpful as you guys! The 800/900 is not very common here so theres little help to get also
wessel8830
First of all check the power from your batteries en check ALL of your fuses. If that's ok then you go further. If i was you i would see if i can get a electric scheme of the startcircuit, than you know where to measure exactly. Just perform the V4 measuring, that will solve your problems definitely.
Erik307
@wessel8830 batteries and fuses are good, i have the scheme now but im not good at reading these things so this will take a while im afraid haha 😛
wessel8830
@Erik307 Sorry, measuring only will not solve your problem. It will give you a diagnose of what the problem is xd, you than have to fix the problem yourself ofcourse.
Erik307
@wessel8830 yeah of course, the problem here is to find the fault 😛
+6
Erik307
Problem solved! Yesterday when i measured the volt on the ignition lock there was only 6 volt. When i measured on the fuse for the ignition lock there was 12,6 volt. Turned out that the wire from the fusebox to the ignition lock that was bad. Fixed a new wire and the tractor is working again as it should! Just want to thank everyone for their help! Maybe this will help someone else in the future also 😄 thanks guys 😄
Wimsumar
Hi ERik307:

Quote Reactie van @Erik307:
tractor is working again as it should!

Nice!
(But, it's hard to believe this (a probable worn wire) caused the problem. So, see you soon in this theater again, I guess. 😉 ).
Erik307
@Wimsumar why would you say that? The moment we put a new wire in everything was okay. What more can it be then?
Wimsumar
Hi Erik307:

Quote Reactie van @Erik307:
What more can it be then?

Well, I don't know. All diagnoses were very weird, you know. It wouldn't surprise me something else shows up soon. Let's hope for the best so far.
Erik307
@Wimsumar yeah thats true, lets hope you are wrong this time and all is good then haha 😄
+1
valmet6400power
@Erik307

Wim is always quite cynical so dont worry, the fact that it works again is most important!
+1
Erik307
@valmet6400power Thats true, hope it will stay okay for a while also 😄

« Terug naar discussielijst

TractorFan kan niet bestaan zonder mensen zoals jij

Heb jij ervaring met de Fendt 920 en hebben de trefwoorden fendt , favorit en 920 geen geheimen voor jou ? Dan kunnen we jouw hulp goed gebruiken! Of je nu actief bijdraagt door foto's, video's, topics, technische gegevens of reacties te plaatsen, of je zorgt er middels de stemknoppen voor dat de beste inhoud naar boven borrelt.. Iedereen kan helpen om dit tot de meest fantastische fan-site te maken die er is. Lid worden is heel eenvoudig!

Tinus
aandachtstractor
REACTIES
63
DEELNEMERS
15
WEERGAVES
23
TREFWOORDEN