If the hydraulic pump is the heart of an excavator, then the hydraulic cylinders are the muscles. Every movement an excavator makes—lifting, digging, reaching, crowding, dumping, and even operating attachments—depends on hydraulic cylinders converting hydraulic pressure into mechanical force. Without them, your 20-ton excavator becomes little more than an expensive lawn ornament. Despite their seemingly simple design, hydraulic cylinders are among the hardest-working componen