When in doubt, always consult the official Hilti documentation or contact a Hilti Service Center for professional advice. After all, a well-maintained tool is a safe and productive tool.
The Hilti TE 22 is a rotary hammer drill that consists of several key components. Here's an overview of the main parts: hilti te 22 parts diagram work
Maintaining the tool's internal compression requires intact O-rings on the pistons (#52, #53, #55) and rotary shaft seals (#84, #85). When in doubt, always consult the official Hilti