1980s Kuhn tedder- how to replace turret rollpin?

[Red Fred]

My old Kuhn trailed tedder (GF452T, 4 rotor folds back for transport, looks like a Fahr Centipede) wore out one of its drive pins yesterday but I soon sorted a new one. However, I have now discovered that an inner rotor is out of time, and having lifted the tedder, the leg fell out since the roll pin at the top had sheared.
It appears a simple enough job.but I can't for the life of me see how to get the new roll pin in since it is right at the top of the vertical leg and hidden when the turret and rotor is reassembled.
I assume the drive train has to come apart back to the central gearbox. I wondered if anyone remembered these or had a parts diagram that might shed some light on it? Thanks!

 

[Red Fred]

Please disregard the question- after walking away and having a cup of tea, I can see the obvious way to do it- take the wheel off the bottom, install the upright shaft along with the basket, tines, etc, and refit the wheel with the bolt supplied. Having stewed over it all night, a new look in daylight and it was obvious.
I'll leave this here as a warning/possible help to others.

 

[seedman stains]

Sometimes the best way

 

[yoki]

Please disregard the question- after walking away and having a cup of tea, I can see the obvious way to do it- take the wheel off the bottom, install the upright shaft along with the basket, tines, etc, and refit the wheel with the bolt supplied. Having stewed over it all night, a new look in daylight and it was obvious.
I'll leave this here as a warning/possible help to others.

I get brought stuff to fix that has sometimes been two or even three other places without success and then people wonder why it takes me a few weeks to get it sorted.

Sometimes you just have to delve in, take in the situation, and then let the sub-conscious get to work on figuring it out while you consciously get on with ordinary simple things.

All of which takes time, and none of which they get charged for.

Some appreciate it, some don't, but such is life.

 

[Red Fred]

Getting the wheel assembly off the shaft after 40 years was a bit tricky with limited resources, but I found I could hold the shaft in the pin holes of an old digger bucket and give the hub casting a gentle wallop, so now it is safely dismantled

 

[Timbo]

Getting the wheel assembly off the shaft after 40 years was a bit tricky with limited resources, but I found I could hold the shaft in the pin holes of an old digger bucket and give the hub casting a gentle wallop, so now it is safely dismantled

Should try the same procedure on the current Kuhn Tedders - you cant! They're put in at the factory with a hydraulic press tool that clamps around the leg and presses the roll pin in - there is absolutely no way to access them due to the rotor with a hammer / punch..

 

[Red Fred]

Should try the same procedure on the current Kuhn Tedders - you cant! They're put in at the factory with a hydraulic press tool that clamps around the leg and presses the roll pin in - there is absolutely no way to access them due to the rotor with a hammer / punch..

Getting the new roll pin in round a corner is a bit of a challenge but I think it's do-able with patience

 

[Dave W]

Getting the new roll pin in round a corner is a bit of a challenge but I think it's do-able with patience

Just done exactly the same job.
If you can borrow a carver cramp it makes the job a lot easier.
I started the roll pin in the casing so it was properly in but not protruding the centre before putting the shaft up. Then carver cramp just squeezed the pin through. Doddle in the end

 

[Red Fred]

Just done exactly the same job.
If you can borrow a carver cramp it makes the job a lot easier.
I started the roll pin in the casing so it was properly in but not protruding the centre before putting the shaft up. Then carver cramp just squeezed the pin through. Doddle in the end

I disconnected the nearest joint in the tubing, and managed to start the roll pin with a lot of swearing, bouncing on the parts and tapping. I clamped it up with some Molegrips to help it in. Then I did the same as you and hammered it to the centre, put the vertical rod in and luckily it wasn't too far away from the hole so I kept knocking it through. As usual after faffing about all day scratching my head, it all went back in no time.
I had it all back by mid afternoon and got all 20 acres done without the neighbours noticing it was getting late