If you have a tractor or even just a big tree you could chain it to, you can get it off the trailer:lol:
Without the dozer on it, it should pull pretty easily forward or backward. If you want to get it going and the batteries don't do the trick, you can pull it either forward in 5th or backwards in 4th gear to start it. You do need to get the reverser lever in the correct position whichever way you pull it. If going forward, pull the reverser lever back toward the seat. If going backwards, push it forwards. Just a note, there is no reverse in 5th gear, the reverser lever does nothing in 5th, the tractor still goes forwards, but you should always put the reverser lever in the forward position when you're driving in 5th to ensure the parts inside the transmission all get lubricated properly.
Check there is oil in engine, Should be a couple inches above the Full when running mark on the dipstick.
Check clutch, injection pump housing, pony motor pinion (if it has a pony) and steering booster underneath seat. (remove sheetmetal cover below fuel tank across the back of the tractor. All these have motor oil in them. 15W-40 diesel engine oil is good for all of this stuff.
Also check gear lube (~75-90 WT unless you will operate in heat over 100, then I would use a multiweight lube 85-140 for example) in transmission, final drive on both sides
Check water in radiator and fuel in tank.
If everything is good, and you want to pull start it. Check that the throttle is closed (pushed hard forward) and the brake is unlocked (little leatch on the right brake pedal under the front edge of the seat near the gear shift lever
Get the D6 rolling and engage the clutch to spin the engine over. I usually check that there is oil pressure showing on the gauge before I open the throttle, but if I can barely move it, I'll try to start it right up as soon as I get it rolling on a good surface for the pulling tractor.
Pull the throttle back toward you (HARD!) and the engine should begin making white smoke, lots of white smoke:lol: As it hits on some cylinders, there will be black puffs and when it is sort of all black, you will likely need to push the clutch forward and let the engine speed up on it's own without the load of the tractor holding it back. Those high gears may be too fast for it to actually move the tractor under it's own power when the engine is cold.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time:D