Question:
I have a DRT900H. It has a growling gear noise. When pushing it in neutral (engine off)it rolls for a bit and then slows down and makes a horrific noise like growling gears. I checked to see if it had grease in the transmission by removing the zirk fitting and probing with a thin wire. The wire showed a small amount of red grease. However, the zirk fitting was absolutely clean on the inside and on the back side. It had never been greased. This is a new unit. Does the factory grease these units before shipping? Did it miss the "add grease" operation?
The units do have grease added to them new. However, it may need some grease added to the unit once you begin to use it. I would recommend adding grease to the transmission. Do not overfill the transmission.