Excavator problems and some solving part1

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Debugging on my Atlas 1404 m 1988
Fuel system, flat tire, oil leakage, hydraulics etc.
Me without any skills or mechanical education, trying to solve problems with a inherited heavy machinepark. If I do something wrong (which I will constantly) or use the improper words, bare with me. English is not my first language.
List of my inspirational youtubers so a shoutout to these
Andrew Camarata
/ @andrewcamarata
Jesse Muller
/ @jmuller86
Mustie1
/ @mustie1
Hamiltonville farm
/ @hamiltonvillefarm

[@paweisyn7446]

Hi.
I leave the subscription and best regards from Poland.
- I also have the old Atlas 1602 ;)
Paweł.

[@RBCOrten]

Fet maskin, kul med hydralik och diesel motor :)

[@erwinrensen]

where is part 2 :-)