Hydraulic power tool with piston seals

A power tool comprising:

• a cylinder;
• a piston having a head at a first end and a rod at a second end, the piston defining a first channel between a first land and a second land, and a second channel between the second land and a third land so that the first channel is between the first end and the second channel, and the piston moveably received in the cylinder so that a second gap between the second land and the cylinder is smaller that each of a first gap between the first land and the cylinder and a third gap between the third land and the cylinder;
• a first set of seals disposed within one of the first channel and the second channel;
• and
• a second set of seals disposed within the other of the first channel and the second channel, a number of seals in the first set of seals being different than a number of seals in the second set of seals.

A hydraulic actuator for a handheld power tool, the actuator comprising:

• a cylinder defining an axis;
• a piston including:
• a rod;
• a head defining a head length along the axis between a first end and a second end opposite the first end, the second end coupled to the rod, the head further defining a first channel between a first land at the first end of the head and a second land, and a second channel between the second land and a third land at the second end of the head,
• the head received in the cylinder so that at least two of a first gap between the first land and the cylinder, a second gap between the second land and the cylinder, and a third gap between the third land and the cylinder are a different radial size relative to the axis;
• a single seal disposed within the first channel and comprising a fluorinated polymer;
• and
• a second set of seals disposed within the second channel, the second set of seals including a first seal configured as a spring seal disposed between the second land and a third seal, the third seal disposed between the first seal and the third land, and a second seal disposed between the first seal and the third seal.