husqvarna · Workshop manual
The machine is designed to stop if the driver leaves the seat while the parking brake is engaged, but only if the PTO is disabled. If it stops, it's likely a safety feature operating as intended, or the PTO was accidentally left on.
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Ensure the PTO (Power Take-Off) switch is in the 'OFF' or deactivated position.
If the machine continues to stop, check the parking brake microswitch for proper function.
Verify the seat switch is working correctly according to the manual's specifications.