This seal kit contains the O-rings and seals needed to service the hydraulic cylinders on a front loader. It is an original Stoll component, meaning its geometry matches the seal grooves and piston clearances of the loader's cylinders as designed. A worn seal kit allows internal leakage past the piston, which reduces lifting force and causes the loader to drift under load. Replacing the kit restores the cylinder's ability to hold pressure without bypass. During installation, clean the cylinder bore and piston rod thoroughly, and lubricate the new seals with hydraulic fluid before assembly.