Sit the machine of level ground, remove the plug at the front of the chain case. Oil shold be level with the bottom of the threads of should be able to be felt if you put a finger in and move it around. You can add it through here too, the other way is at your feet where the park brake pedal is, but you will need to re-seal it. Try and use the plug at the front if possible.
Now the play, this can be fixed to an extent, depends n how far you want to go. The steering linkages are all bushed with steel and rubber, they can be changed to remove most of the play. The bar that they run on does wear as do the bearings at either end, they wear or they wear the rod. It can all be replaced for a price.
If you were talking hydraulic controls this can be done too, but the pedals wear on the pivot points, i modified mine to have a sleeve and they are now greasable. It will wear where it crosses the chain case for the lift function and they will wear in the eyes of the spools, i made new pins and drilled the spool eyes out to remove the play and made pins to suit. Its now tight as possible, like new.
Leaky rear axle seal, if its a standard 743 and not a 743B you have one piece axles, you will need to pull the pump and engine out to gain access to remove the axle and replace the leaky seal, do all 4 if you go that far though!
It can all be done, just depends on how much time you want to spend. If you have a lathe and a little mechanical abilities you can do it all your self and pretty cheap, just takes time.
