Important
For all installation of seals it is important not to scratch the sealing surfaces.
1. Avoid sharp edges on seal housings.
2. Use tools that are smooth and free of burrs.
3. Keep everything clean.

Installation of External Seals on Pistons
For installation of bigger series of seals, it is convenient to make a set of assembly tools. It consists of a tapered mandrel and a pusher made of acetal or similar plastic. Seals are pushed over the mandrel into the groove by a quick push. For installation of a few seals, two pieces of strapping used as shown at fig. 2 and 3 are sufficient. Where the piston has to be installed in a bore without an inlet chamfer, a calibrating tool will facilitate the installation. See fig. 4.

Installation of Internal Seals in Glands
Installation of small diameter internal seals requires open grooves. For bigger diameter seals it is possible to assemble by collapsing the seal as shown on fig. 5 and 6. After installation of the seal it should be calibrated by a well chamfered and smooth rod of acetal or similar plastic.