Quoted from rocksolid87:My teenage nephew was recently given a Gottlieb Globe Trotter machine.
Congratulations to you and your nephew! Globe Trotter is a fun one.
Quoted from rocksolid87:I'm new to working on pinball machines and was hoping to get some advise/wisdom from those who know how.
You can get lots of info and advice here, but the following is a must read before you and your nephew start working on machine: Clay's Repairing Electro-Mechanical (EM) Pinball & Coin Operated Games to 1978 (http://www.pinrepair.com/em/index1.htm).
Other advice: Take lots of photos when you dismantle things. Work on one issue/problem at a time. Be careful with 120V circuits (there are wires associated with one that go to the coin door!). Learn how to read pinball schematics, solder well, and adjust switch blades correctly.
Quoted from rocksolid87:are there any other parts that should be replaced due to age?
It looks like you are already getting rubber rings, balls, new plastics, and a new power cord. These may be all that need to be replaced. You will learn more after you go through it as recommended in Clay's guide at the link above. Rarely coils are burned up and no longer working, but these will be obviously burnt and most coils are probably fine. Unless something is missing, chances are good that all will (eventually) work as it should.
If the machine didn't come with one, buy a schematic from Pinball Resource. This will help immensely when you need to troubleshoot problems (and there will be problems).
Quoted from rocksolid87:Should we clean all of the contacts for various switches and components (I use DeoxIt)? Should anything be lubricated?
Short answer is no. Read Clay's guide at the link above as it includes sections on lubrication and contact cleaner (http://www.pinrepair.com/em/index1.htm#lube) with very strongly recommended advice about these: "WARNING: DO NOT USE CONTACT CLEANER OR WD-40 IN EM GAMES!" and "Electro-Mechanical machines, for the most part, do not use any lubrication."
Quoted from rocksolid87:How about the coin mech? He has the door (not pictured), but the coin mech is missing. I assume this can be wired for playing without the mech?
Coin mechs are hard to find, but you can easily modify the machine to work on free play (it is a simple matter of bending a switch blade on a switch stack on the replay stepper so that the switch stays closed and the machine "thinks" there are replays available)--info on how to do this should be in Clay's guide listed above or you can figure it out on your own by reading the schematic.