If you lock the boom up on the other side you might not even need to lower the rod it may swing out of the way enough. A couple 9/16 wrenches and a hammer will have you rolling
I would open up the fuse cover and look at the relay and fuses. If everything looks good I would tip the cab up and look at the lock solenoid. It could be getting weak and the longer it runs it heats up and opens the circuit
2 wire hydraulic hose works for most applications. Drive motors sometimes 4 wire but they get pretty stiff. On that machine almost every thing will be jic flare fittings
That big belt is the main drive belt for all the hydraulics. I would look at the belt for damage if it was slipping. I would also closely check oils for water if not change it. Also keep an eye for water contamination in the fuel as the tank sits in the bottom of the machine. The main fuse panel...
Most are high pressure braided hoses. You may have multiple leaks. I would raise the arms if possible. If they raise do they stay this could point to a leak after the valve body. The pump to valve hose is common. I would also look at the drive motor hoses.
Not sure on your machine. We have a couple smaller machines a 2054 and 2044 that use a standard 8 bolt pattern. I don’t know how many hours you put on or what kind of jobs you do but our mustang didnt like solid tires the cabs shook apart.
If the barrel and piston are ok I would think a rod should be available from Deere otherwise you could check loader parts source to see if they have a aftermarket one
Galaxy hulks are good tires. The Carlisle ultra guards are good too. If you are in much mud I would look into a regular tread. The block style of the industrial tires doesn’t clean well. Best I have found have been galaxy beefy baby or Titan xd2002