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Welcome to Fergie ownership! Just visiting from the Harry Ferguson board. You should be able to get a new valve insert from any agricultural tyre merchant. First remove the old valve by moving the tyre so that the valve is at the highest point possible - and then insert two thin 'prongs' of stiff wire either side of the valve button (ie inside the valve 'pipe' that you can see), and unscrew the valve. There is a valve removal tool you can buy to do this - or borrow one from said tyre merchant. Take the valve insert to the merchant and get another one. Replacement is the reverse of removal, as they say. The fluid ballast was added to your tyres to increase weight, and reduce wheel slip when doing 'heavy' work, such as ploughing. You may be lucky with the existing valve if you (a) push the valve in to flush out any dirt, and then (b) reinflate the tyre with a footpump, or similar. If any of the above looks like hard work, then you could always ask said tyre merchant to swing by when next in the area - but will cost $$ for a home visit. Good luck.
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