Re: AC compressor clutch not engaging
No or too low freon equals no or short clutch engagement.
Double check belt tension. Normally belt slippage is fairly noisy but possible a foreign tractor came with silent belts? Or you have a oil leak somewhere and the belt is too wet to make noise.
The old A-6 and A-4 GM compressors could have their clutches replaced while on the vehicle and without draining the freon. No clue on yours.
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