Hello, We have a Crown SC4520 and lately the forward movement is jerky. Moving in reverse is fine. we have checked out and reconditioned the battery. We do not get any error codes. A technician came out and said that both the gearboxes would need to be replaced. Have anyone else come across this and a possible solution. I am waiting for the crown factory tech to come out and let us know what is wrong.

Any help is appreciated.