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Read articles →A hands-on AC diagnostic walkthrough on a Kioti DK5310 with a recurring cooling failure and a locked-up compressor. The mechanic connects a recovery machine, checks refrigerant levels against service records, pulls a vacuum, then pressure-tests with nitrogen/forming gas using a leak-detection method most tractor videos skip entirely. Real shop depth here, though the repair itself isn't completed, best for owners or techs facing a stubborn AC comeback.
ThePracticalMechanic appears to be an independent shop taking in warranty referrals from a dealer, suggesting a working-technician perspective rather than a dealership or hobbyist channel.
The transcript shows the compressor snapped its belt and is locked up, found during diagnosis after the tractor had a new condenser and compressor installed but still would not cool.
After pulling a vacuum, the system is filled with forming gas (5% hydrogen, 95% nitrogen) through the high side, pressures are stabilized, then a tightness test monitors pressure differential over time.
The recovery machine pulled about 0.6 of a pound, far less than the 1.25 pounds charged at the previous service when the tractor had 578 hours.
Possible causes mentioned include a leak at compressor O-rings, oily suction line residue, debris clogging the condenser, or an issue at the expansion valve or evaporator.