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Zetor 7245

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RSVRRic
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Zetor 7245  
  Started at Wed Nov 5 23:52:57 2003
When I have my rear hydraulic arms raised with weight on them they drop slightly and then raise back up to their original level in a continual pump action - anyone got any ideas as to what could be causing this ??
cry
 
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gw
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Re: Zetor 7245  
  Reply #1 Posted at Thu Nov 6 13:45:44 2003
This annoying thing happens with my 7245 and after speaking to my dealer he told me it is some seal in the backend somewhere leaking and is expensive to sort. Since then i have just had to bear it.
 
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Renze
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Re: Zetor 7245  
  Reply #2 Posted at Thu Nov 6 18:06:38 2003
Last Modified at Thu Nov 6 18:08:25 2003 by Renze

Yes, many of them have these minor internal leaks.
Not a real problem, the position control corrects itself and no oil is leaking to outside the tranny.

....You say continous pump action... Do you hace draft force control engaged ?? The small lever saying p-m-s is position-mixed and draft control.


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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Crystalman


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Re: Zetor 7245  
  Reply #3 Posted at Thu Nov 6 20:20:17 2003
I had that happen on our old 6748.As we have a 900kg counterweight for the loader it had to be fixed.The Lift piston and barrel were OK and she only needed new seals costing pennies.But the labour to strip out the cab and remove the top cover was pretty high.If you have the time and knowledge to do it yourself it would be a cheap repair.

 
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Renze
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Re: Zetor 7245  
  Reply #4 Posted at Fri Nov 7 18:19:53 2003
Crystalman, are you sure that the complete cab has to be taken off to be able to take off the lift housing ??

I think maybe just removing the cab floor is enough ??

What seals did you replace btw ?? the lift piston rings ??


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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RSVRRic
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Re: Zetor 7245  
  Reply #5 Posted at Sat Nov 8 08:35:47 2003
Renze - what position does the draft force lever have to be in when operating and working with the rear hydraulic arms.

I also understand that of the 3 levers below the seat the centre one has to be turned to the left , with the left hand one being forward (is there two forward positions on this). Obviously the right hand one is high and low ratio.

Apologies for my ignorance however I'am unsure if the problem experienced is a fault or my understanding of the hydraulics operation.

Richard - Scotland
 
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Renze
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Re: Zetor 7245  
  Reply #6 Posted at Sat Nov 8 15:27:54 2003
I think it shoudl be in P position, position control.
I dont know how the S translates from Czech..


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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Crystalman


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Re: Zetor 7245  
  Reply #7 Posted at Sun Nov 9 12:14:06 2003
That's right Renze,there were just a few floor panels to remove and that extremely heavy Zetor air seat that the early models have.We did just need the piston ram seals changing and of course the rubber O ring that goes between the transmission casing and the hydraulic top cover.Now you can switch off the engine and the weight will stay up for a long while-not recommended on a regular basis! Earlier this year I had to fit a new seal on the pump outlet under the tractor as it was leaking oil due to some rather heavy big bales.After trying various alternatives and different sealing washers including one with a rubber seal inside which one worked best? Yes-the original Zetor blanking plug with a brand new Zetor copper washergrin

 
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Renze
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Re: Zetor 7245  
  Reply #8 Posted at Mon Nov 10 18:24:50 2003
Crystalman,

Our 5245 has a lift problem, the Zetormatic control lever is stuck as a house, and the position lever has more friction in the upper end of the travel. In that end, the oil flow also seems to be obstructed. Could this be caused by the additional Zetormatic control valve, that is stuck inside the main lift valve and therefor jerking with the lift ?
Not many people seem to recognise this, i have had no time to go and have an inside look for myself, but this winter i want to fix it all the way, we bought it 4 years ago and it was already in a very poor serviced condition when we got it.


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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phil
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Re: Zetor 7245  
  Reply #9 Posted at Mon Nov 10 18:57:56 2003
yes my 7745 hydraulics do the same as Richards - very annoting. In my experience all Zetor tractors seem to have weak hydraulic seals and hoses.The hydraulics on the 7745 are sagging alot at the moment. The oil pressure seems ok, there is enough oil in the resevoir and the system is not leaking. How can i fix it Doc?

(excuse me for my ingnorance and poor technical knowledge)

Cheers, Phil
 
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Renze
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Re: Zetor 7245  
  Reply #10 Posted at Mon Nov 10 19:27:13 2003
You can remove the floor panel with some bolts, so you can take off the floor including the chair in once.
Then you should find a place to attach a rope or something else to make lifting off the hitch cover easier, it weighs about 100 kg i think. (do not forget to release the bolts before attempting to lift it off wink )

On the bottom side of the hitch cover, the lift cylinder is mounted with bolts, it has now pivoting points, it's rigid mounted. It is connected to the hitch arm crank by a rod with two ball heads that pushes the crank. it hink it's not too hard to release the bolts from there, i think the lift piston will just slide out of the cylinder with no obstructions (but i havent done this before, just my expectations)

the piston rings wouldn't be too expensive, i think.


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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Crystalman


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Re: Zetor 7245  
  Reply #11 Posted at Thu Nov 13 17:19:22 2003
Renze-I take it you mean the D-M-P lever is stuck? Or is it the main lift lever? It may be a stuck valve with pressure trapped in the system somewhere.Or there may be some rust on the shafts of the levers where they go one inside the other.I know that on my MF 135 scraper tractor it has recently started to seize its levers solid if you leave it for a few weeks despite oiling everything.

 
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Renze
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Re: Zetor 7245  
  Reply #12 Posted at Fri Nov 14 17:49:13 2003
Last Modified at Fri Nov 14 17:50:20 2003 by Renze

Yes it's the D-M-P lever, or S-M-P lever as the markings say.

The lift is pretty well used, we have a 2 meter wide transport bucket, last two years i have used it often for landscaping, paveing the yard (finally after all those years of mud) and digging. My father isn't happy with this but it's lots cheaper than hiring a wheel loader or excavator all the time.
I have reinforced the bucket, and replaced some sheets last year, but the tractor needs some work too, this winter.
It has intermittently been in knee-deep mud and hog shit the last years, the brakes are worn because the housings are full of shit.



1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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PHILIP VITINIOTIS
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ALL ABOUT ZETOR....  
  Reply #13 Posted at Sun Nov 16 23:09:57 2003
HI!I'AM A STUDENT FROM GREECE.I WANT TO LEARNE MORE THINGS ABOUT ZETOR TRACTORS.I HAVE A PROJECT SO I MUST LEARNE ABOUT THE ORGANS INSIDE THE CABIN OF A USUALL TRACTOR OF ZETOR.PLEASE HELP ME!SORRY ABOUT MY PURE ENGLISH KNOGLENCE....
 
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Crystalman


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Re: Zetor 7245  
  Reply #14 Posted at Mon Nov 17 16:36:40 2003
Maybe your lever has just seized up through lack of use? Pig muck and water will seize anything up in a short time-especially if you only use the lever every couple of years!

 
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Renze
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Re: Zetor 7245  
  Reply #15 Posted at Mon Nov 17 19:31:16 2003
Yes... nothing more corrosive and erosive than hog muck.
The zetormatic lever was stuck when we bought it. Yhat was 3 years before it entered the hog muck. When we had the foot and mouth disease, no hogs allowed to move through our area so we had to keep them. We had hogs all over the yard, in a dead end between two barns. mud was 50 cm deep, i had it stuck a few times, hanging on teh belly and the wheels turning free....


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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Markku


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Re: Zetor 7245  
  Reply #16 Posted at Fri Nov 21 09:14:15 2003
Hello Mr RSVRRic!

We had 7245, but I can´t remember did it have external lifting cylinder.....

Our 6245 and 7745 does have the lifting cylinder that is outside the transmission house. This cylinder has bad quality seals and replacing those seal the problem can be fixed. I THINKmouthshut

I have been replaced those seals allmost all of our Zetors after about 3000 hours use........... Not expensive to try this solution first.cool

 
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MADE IN BRNO!


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Re: Zetor 7245  
  Reply #17 Posted at Sun Nov 6 23:48:44 2005
NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! YOU IDIOTS!!! PUT THE P.T.O LEVER OFF!!!!!!!!!!!!! THIS STOPS THE HYDRAUILCS PUMPING! (M) IS FOR (MIXED) ( BALE SPIKE AND THINGS) (P ) IS FOR (PLOUGHING) ( S) IS FOR (STAY!! THERE!!!) (TRANSPORT)

 
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smelly


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Re: Zetor 7245  
  Reply #18 Posted at Mon Nov 7 00:12:12 2005
made in brnot ,
short and sweet thanks
just learned somthing new


 
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Renze
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Re: Zetor 7245  
  Reply #19 Posted at Tue Nov 8 18:03:22 2005
Hmm... Made in Brno, you're telling something that's new to us.... rolleyes tongue


1967 Zetor 3011, technically new, needs paint
1973 Zetor 5718, repainted and shiny, rebuilding it bit by bit
 
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MADE IN BRNO!
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Re: Zetor 7245  
  Reply #20 Posted at Tue Nov 8 18:55:16 2005
RENZE, I WILL TAKE THAT AS A COMPLIMENTwink. THE HYDRAULICS WILL DROP A LITTLE OVER A LONG DISTANCE EVEN IN TRANSPORT POSITION shocked. SO ALWAYS LOOK BEHIND JUST IN CASE YOUR NOT PLOUGHING THE ROAD!embarassedconfused THE NEW PROXIMA IS NOT GOING WELL WITH THE LOCAL FARMERS HERE I WALES FOR 3 REASONS (1) THE ZETOR DEALER IS SELLING CLASS TRACTORS FOR NEARLY THE SAME PRICE!! AND (2) THE BONNET IS MADE FROM PLASTIC SO NOT GOOD FOR DRIVING NEAR THE COWS!shocked AND WORST STILL NO PASSENGER SEAT!!!!!confused I THINK YOU CAN GET ONE BUT IT COSTS EXTRA sad THE NEW PROXIMA 80HP COSTS NEARLY £19.000 WITH OUT A LOADER! BUT CLASS IS ONLY £18.000! BUT ECONOMY VERSION WITH RUBBISH CAB AND NO ELECTRONCS cry ITS UP TO YOU IF YOU LIKE RED OR GREEN!wink REALLY LIKE YOUR LOADER RENZEhappy YOU SHOULD BE A ENGINEER!
 
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