My new Zetor 6745

[shanehobson]

I've just bought a Zetor 6745 based on two sketchy photos and minimal description for $NZ2000 ($US1400).
It's 400km away, so shipping will be about $500 to get it here.

Apparently it has a broken PTO shaft and there is a spare included with it.

I plan to use this for baling hay with my Welger AP71 baler, 2 tonnes of German engineering.

Between now and hay season (January - March) I need to fix the PTO, change all fluids, fix the brakes and clutch.

If it's not too much of an intrusion, I'll try to document the work in this thread.

 

[Agvg]

They are very easy and logical to wrench on, brakes are std job on almost all old Zetors, parts are very cheap so no point leaving questionable parts in place. Remember to replace axle seals.

 

[BertZegers]

Try ATP Motor.cz for parts. A parts manual would be handy. For me in Canada, the cost of the parts offset the delivery costs.
Takes about 2 weeks to deliver.
You can ask a quote. And you can pay with credit card. Works great for me.

ATP Motor - Náhradní díly a pneumatiky na traktory typu ZETOR, ZTS, URSUS, zem?d?lskou a stavební techniku

Bert.

 

[shanehobson]

My Zetor was delivered yesterday.
The truck driver could have put it anywhere on my 10 acres but thought that directly in front of my garage roller door was the best idea.
First I heard about it's arrival was a phone call from the wife "what's this big ugly orange thing in front of my garage"

Anyway, moved it around the back and it felt like the brakes were grabbing, now it's stuck !
Won't move just stalls as the clutch engages so I'm guessing the brakes are now well and truely stuck on.

Normally I'd start picking away at this problem myself, but it's blocking access to my workshop so need it fixed soon. So my tractor mechanic friend is coming over tomorrow for a look.
He's also a Zetor owner so that's got to help as well.

Some pics attached.

 

[shanehobson]

By the way, does anyone know the gear select layout ?
The gear lever is on the dash and there are no markings to indicate the layout. The owners manual doesn't tell me.
If someone else as a 6745 with the gear layout showing on the dash I'd be appreciative of a photo.

 

[shanehobson]

Spoke with the last owner this morning, he assures me it was in good working order with no sign of brakes sticking.
He said the handbrake cable broke years ago (that explains the broken cable I couldn't explain) and the lever that looks like a handbrake is actually a hand operated clutch.
He thinks the tractor is stuck between gears somehow causing it to not move (entirely possible as I was guessing at the gear select).

 

[Agvg]

Can you shift gears or is the gear shifter stuck?
The clutch is a PTO clutch.

 

[Agvg]

You can just lift up the mechanism under the dash, it's four bolts and see if anything is stuck.

 

[Agvg]

 

[shanehobson]

Gear lever seems to move around and engage gears ok. It stalls as the foot operated clutch is engaged.
The owner described removing a plate between my legs on top of the transmission that will provide access to the gear linkages. He talked about the notches on the linkages being aligned when the gear lever is in neutral. He seemed to think they might be misaligned.
Thank you for the gear layout, that's really helpful.

 

[Agvg]

What happens if you put Hi/lo in neutral?

 

[shanehobson]

Dark outside now, will report back in 14 hours

 

[Agvg]

I would just unbolt the gear selector under the dash, lift it up and put all back in neutral.
There are an upgrade for the gear shifter that you can buy at the dealer.
Have seen some whit much wear on the guide plates for the shifter, just build it up whit welding and grind it.

 

[shanehobson]

Fixed. As I suspected (not as suggested by the last owner) the brakes were jammed on.
It looks like one side of the handbrake was dragging and both hydraulic cylinders on the foot brakes were badly rusted up.
Handbrake has been disconnected (it will be a big job to reinstate it fully, so will save that for another day).
Cylinders will be replaced.

Removed the broken PTO shaft by welding a nut on the broken stub and using a slide hammer to pull it off.
New PTO shaft goes on when the replacement bolt arrives.

Need to tighten up the hand throttle control.

 

[Agvg]

Quit common on older Zetors, plan for a brake job, not much work if you have concrete floor and something to lift with. Parts are cheap so don't leave dodgy parts in there. Remember to replace seals on drum and seal in to the diff.

 

[shanehobson]

Fitted new hydraulic brake cylinders today, brakes work much better.
Found there is no handbrake handle at all and the handbrake cable is broken, so will buy those parts.
Water pump is in very poor condition and needs to be replaced.
Also found the 4th & 5th gear linkage is probably broken. Tractor sometimes gets jammed in 4th gear. Selector is moved out of 4th gear to another gear but gearbox stays in 4th gear. Tractor won't move.
Mechanic is pretty sure the selector is broken. So looking for another one.
Also found there is a pin through the gear lever under the gear lever housing that is missing.
The pin stops the gear lever moving in ways that it shouldn't.
With the pin missing the gear lever moves around in weird ways and is probably contributing to gear selection problems (compounded by the broken linkage and not knowing the gear layout).
Made good progress.

Hooked up my disc mower today, 3PL works ok and hydraulic port at the rear works ok.

 

[shanehobson]

Fitted new water pump, pulled transmission lid off and found 4th / 5th selector broken. Waiting for a replacement from the local dismantler.
Had a proper play with my disc mower and found the hydraulic pressure is low. It can lift the mower on the 3PL (only just), but can't fold the mower up (there is a small ram on the mower for folding fed from a hydraulic remote on the tractor).
Mechanic suspects worn out hydraulic pump.
Any ideas if these can be fixed with a repair kit or is it a throw away item ?

 

[Agvg]

Replace, those pumps are very cheap and easy to replace.

 

[shanehobson]

Bought a used hydraulic pump for $50 (had to remove it myself after draining water out of the wrecked tractor's transmission). I've left it sitting in a bucket of diesel to help clean it up. In the meantime the mighty 6745 has been doing a good job of pulling my 2 tonne Welger hay baler around. It's doing that so well, that I'll probably keep it just for my baler and not bother fixing the hydraulics. Having actually tried the brakes on a hill I've found that the foot brakes work very poorly and the handbrake works well. I assume they're both pulling on the same set of brake shoes so is there an adjustment to improve the foot brake operation ?
BTW, I find the handbrake style operation of the PTO clutch really useful rather than the two stage foot pedal on most tractors. Hand operated PTO clutch means I can stop and start the baler without stopping tractor movement. I've also got better control over the speed of PTO clutch engagement.

 

[Agvg]

There are two separate brake systems for foot and parking brake, the foot brake is self adjusting.