Hello I have a Komatsu PC300LC-6LE have had it for 2 years now but never looked into why window wiper and heater didn't work. But yesterday while we had it down for maintenance we deicide to look into it a bit. My step father not thinking pulled a fuse and the machine shut down. Put fuse in machine will start back up and idles up fine and seems to function fine but now the display for gauges and modes ect will not come on. I am not sure what happened or where to check for issues. Machine has been a good machine but you can tell someone has the inside of the cap partly apart before as wires are disconnected and we have no idea what they go to. We never really wanted to mess with them as machine ran and does what its suppose too. But this time of year windshield like to fog up or when its raining its hard to see without putting the windshield up. So against my better judgement we started poking around. 3 fuses are missing and never have been in the machine since i got it. No clue what they control. My machine concern at the moment is getting the display working again. so modes ect can be changed. Only other issues we have had with the machine is a line going to the hydraulic pump keeps dripping from where the hose connects. We put a new O ring in and it was still dripping a bit we ran the machine for a little bit and checked it again and it had stopped. Now periodically it drips when you first start it or sometimes while its being run. We have changed O ring multiple times but keep coming back to same problem. Besides that we have put a water pump on the machine and a oil cooler. If we run the machine it loses about a gallon to gallon and half of coolant a day but we have yet to find where its leaking it or if its burning it. but you can get a slight smell of antifreeze now and then like its leaking we just haven't found it. Going to try tracer dye with a UV flashlight see if we have any luck. Beyond that we are unsure if new oil cooler is leaking internally or if its left over oil we didn't get fully flushed cooling system when we changed oil cooler but we are getting sludge here and there in the radiator but machine never seems to get hot and oil never seems to go down like its eating it. If anyone has any ideas on the display ect i would greatly appreciate the help! Attached are pictures of the tag on side of the cab and a picture i got from ebay of the display as i forgot to take one while i was in machine.
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