I have done such a thing more than once so i am speaking from experience.

An engine hoist is a must i used one with a capability of 2 tons

A pallet truck will fail because of instability and the whole of the machine would have to be sitting on the forks and you will fail there too.

I made a dolly this would be as wide as i could get through the door way and as long as the base of the machine this was made from 2 x 4 steel tube welded fixed to this are 200mm dia castors HD around £23 each from machine mart.

To travel from the front of the house to the back, i used 2 x 4 steel U channel with welded brackets that fixed the channel to a cross member that fitted between a doorway. So you are effectively making a railway track so the thing cannot come off the rails.

They were cut to 8 foot lengths and even then it took an incredible amount of effort to get them up the rails.

Machines moved Bridgeport, J&S 540 surface grinder & Myford cylindrical grinder

The worst cast scenario is the machine falls over causing damage the worst case scenario is someone gets killed if it falls on them if you fail to take the required precautions.

One last thing, you have left it way too late to ask for advice.

Phil