The solid metal piece that holds the chuck on one end and receives the blows from the hammer on the other. This part undergoes immense torsional stress.

A standard factory schematic separates the tool into specific, orderable part numbers. Below is a breakdown of the key components found in the official parts list, categorized by assembly modules.

Small mechanical seals that absorb high frequencies and keep the bit securely centered inside the anvil socket.

The external collar you pull forward to insert a bit. It is backed by a small compression spring and a locking ball or retaining ring.

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While a desire for a "do-it-yourself" parts diagram is understandable, Hilti's service model offers a distinct advantage for professionals. Many Hilti tools, including the SID 4-A22, are covered under a comprehensive that includes free repair and replacement of worn parts due to normal wear and tear. This often makes going through Hilti for repairs more cost-effective and far less time-consuming than sourcing parts and performing the repair yourself.

Consists of the rotor (armature) and stator. Hilti’s brushless design minimizes friction, reducing the number of moving parts that can wear out.

Part numbers above are representative examples; exact numbers require serial number verification.

The planetary gearing system that multiplies motor torque.

This article serves as a comprehensive guide to understanding the SID 4-A22's components, discovering where to get an accurate parts diagram, sourcing genuine replacement parts, and executing effective maintenance.