You need both. But the is your lifeline when you’re on the phone with a supplier, trying to identify a worn out joystick or a leaking hydraulic cylinder.
: Alongside part details, technical specifications such as material used, dimensions, and performance parameters could be included. Ameriquip Eagle 42 Parts Manual
Specialty retailers like Peace Software or Tradebit sell instant-download PDFs. Read the preview—if the exploded views are blurry, avoid them. You need both