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Hi my name is Robert
DO you have hydrualic jacks? IF so with the jacks retracted I would check the fluid level, on many systems if the fluid was low and you go to take off it would give and audible alarm. Make sure the antenna is also stowed, have seen some that will use an alarm for that as well. Check all your fluid levels make sure they are good and make sure you have good chassis battery voltage. Beyond that hard to say for sure what is causing it... Robert