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Zetor 7245 Power Steering

ossix

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Aug 15, 2012
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ossix
I acquired a 7245 & have been working to get it put back together. The engine seems good & runs well, but everything else has been a nightmare. I've done the easy things - replacing hoses, fuel lines, brake lines, electrical re-wiring , new starter. Now the hard stuff.

The clutch was always flakey, so I replaced the slave & master cylinders. Now it works great.

After I had that done, the power steering went. I did add some ATF fluid after removing the cylinder to install a new boot cover. It never worked well anyways & always seemed temperamental, but now when the tractor is running the wheels just ram to the left & will not move without an excessive amount of force. I can move them fairly easily with the tractor off , so I don't think the problem is a steering gear issue.

I've been told the problem is likely the seals in the booster, and I should replace the whole cylinder. I'm not thrilled about spending $700 for a new one, especially if it's just a matter or an adjustment.

I don't see any leaks of ATF fluid.

The rear brakes are gone, too, and I can hear a leak of air when I mash down on the brakes from the right-hand slave cylinder. I've read they originals were crap, so I'll have to tear the rear end apart one day & replace them both.

The only other serious issue is that the breather is spitting oil. Not ton, but a fair amount & definitely enough to require consistent filling. From what I read it's likely to be the result of improperly seated piston rings, and a few good days of work will likely re-seat them and eliminate the pressure causing the breather to spit oil. Unfortunately because of the brakes, clutch & steering, I haven't been able to actually use it for anything.

It was overheating, too, but I think that was just a dirty radiator. The fins are pretty well cleaned out now & I'm confident that's not going to be an issue again.

Thanks for any advice you may have.


 
After I had that done, the power steering went. I did add some ATF fluid after removing the cylinder to install a new boot cover. It never worked well anyways & always seemed temperamental, but now when the tractor is running the wheels just ram to the left & will not move without an excessive amount of force. I can move them fairly easily with the tractor off , so I don't think the problem is a steering gear issue.

Sounds like adjustment, the Ram is designed to self-centre, if adjusted wrong it will self-steer! you would have upset the adjustment when fitting the new boot.
loosen the locknut on the fine thread on the valve end on the ram and screw the valve pack in and out until centre is found, there are instructions for this in the manual but it is not an easy read............... search this site and you will find more info on this, i have read several posts on this subject.
Note the steering is less than perfect from new, and dont expect to be able to steer it with 1 finger when not moving, but when moving it seems to do the job.
My 6745 had the Italian steering and when trying to increase the relief valve pressure i over did it and split the front plate on the Alloy PS pump......... now i am fitting the Zetor cast iron PS pump with 3 times as many bolts holding on the front plate.

Cheers
Steve

 
Thanks again, Steve. Your fix worked perfectly. And now that I've got fresh fluid in the pst tank, the tractor is handling better than it ever has.
 
Hi, glad it worked, and thanks for letting us know :)
 

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