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riber3

Yanmar tractor arms stuck

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Hi everyone
 
Not sure if I am in the right category here as I am trying to help someone with their small tractor.
 
Its a Yanmar 1401 and the problem with it is the arms will not raise or lower.
 
The PTO works fine and engages in all 3 positions
 
I have attached some photos so you can see it and I have looked on line for a service and user manual. So far I have found a generic user manual for it and a parts catalogue in Chinese!!
 
He told me he had changed the oil using a red HV46 which he says is the correct one for this model but he had not removed and cleaned the filter which I did today.
Sadly it didn't make any difference and the arms still remain stuck in the Up Position.
 
I tried altering the flow Valve and I can feel the Operating Lever Selector Spring when I push it forward for Up but not so much when I pull it back for Down.
 
We have both tried pulling the arms down by hand but it appears seized or locked there. 
 
I am not sure if by removing the the top over plate would allow access to free it off? or if there is a safety override lock that needs resetting?
 
So I would welcome any advice on how to fix it?

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I think I may have misnamed the part I have been writing about as I realise now that it is called the Rear End Loader

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