I've got a G51P Yale forklift and I've been trying to get it working. The gearbox was full of water and I'm trying to locate some information about the oil type it takes in the transmission and diff. It appears that it's all one oil, is that correct?.. and the only level bung I can find is at the front of the diff. and the only filler I can find is on top of the gearbox/diff in front of the selector. I'm just confirming if this is the only level bung and filler for both the transmission and diff as there is 2 separate drain bungs underneath. I would greatly appreciate your information and advice on this matter.