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Read articles →This is a hands-on DIY repair on a Kubota M4900's non-working cab AC, filmed by the farm owner who actually uses this tractor daily. It walks through pulling the compressor, measuring and replacing PAG oil, swapping in an aftermarket Denso-type compressor (around $220 versus a costlier Kubota clutch), installing a new dryer, and recharging refrigerant, though the real fix turns out to be a faulty switch, not the compressor. Useful for owners troubleshooting AC issues themselves.
Posted by Mill Gap Farms, an owner-operator farm couple documenting their own repair work rather than a dealer or professional mechanic.
Loosen the tensioner, pull the belt, remove four bolts, disconnect the compressor, measure out the old PAG oil, then install the new compressor and dryer before recharging refrigerant.
The owner bought a Denso-type aftermarket compressor for about $220, versus an estimated $500 to $600 plus shipping for a Kubota clutch.
After replacing the compressor, dryer, and refrigerant, the owner found the real issue was a faulty switch, noticed because the dash blue light would flicker.
