Some third-party sites offer PDFs that are watermarked or out-of-date. Stick to the free, official Hilti source to ensure accuracy.
For a visual overview of controls and maintenance, you can view the Hilti SID 4-A22 Manual . hilti sid 4 a22 parts diagram free
Once you have your in hand, you will notice the tool is broken down into logical "assemblies." Here is what those numbers correspond to: Some third-party sites offer PDFs that are watermarked