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My ZD21 loses power when mowing. It is not a function of the grass thickness. The symptoms are that the RPMs will decrease to around idle as if it's starving to for fuel. The solution is to disengage the mower deck whereupon RPMs will return to normal. Reengage the blades and continue for 50...

ZD-21 will not charge. Battery loses charge after about 6 hours of running. Charge and works fine for 6 more hours. I've tested the dynamo and I'm getting AC voltage that varies with speed of engine as it should. I've also testing it off the machine by hand spinning and it creates AC voltage...