Hi blovett85,
Your Levers are missing the colored plastic handles.
When sitting in your tractor seat, the two levers to your left, I believe:
First Lever (should be Red) is shorter in length, is the parking brake,
Second Lever (should be Yellow) is longer in length, is the PTO Hand Clutch.
The two black Levers on the floor between your legs behind the gear shift lever,
I am not sure about them because they both have black colored handles,
but I lean toward them being for selecting the PTO options.
You may have a two-speed PTO system, which one of these two levers may be used to select between the two PTO speeds.
My two Levers on the floor between my legs behind the gear shift lever, the one to the left (Yellow) is for PTO selections.
The one to the right (Black) is for the High and Low speed range selection.
My 3340
Zetor is a 4WD and only has the single PTO speed system with the Shuttle-Shift transmission.
Also I have the High and Low range lever (see my picture up at the second posting).
I hope this info is a
help for you.