generally the hydraulic fill is over on the right hand side of the lift under the hood, there should be a fill tube with a breather cap and maybe even a dip stick to check the oil level. On the left hand side there should be a fuel cap either on the side of the lift inside a recessed part of the frame or under the hood, the cap should say fuel. Of course if the truck is an LPG truck that fuel tank will not be operational, most machines have the tank already installed from the factory as a standard part of frame assembly.
Most cats were like that.
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