Hilti Sid 4 A22 Parts Diagram May 2026

If your Sid 4 A22 feels like a standard drill (no impacting), the hammer (03) or the cam spring is likely broken. The diagram shows how these interlock—replace as a set. Section B: Planetary Gearbox (Transmission) | Diagram Reference | Part Name | Function | Common Issue | |------------------|-----------|----------|---------------| | 06 | Ring Gear (Annulus) | Outer gear of planetary system | Stripped internal teeth | | 07 | Planet Carrier (Stage 1 & 2) | Holds planet gears | Cracked carrier arms | | 08 | Sun Gear (Input) | Connects motor shaft to first stage | Excessive wear (noise) | | 09 | Needle Bearing | Reduces friction on carrier | Seizure due to lack of grease |

| Component | OEM (Hilti) | Aftermarket | |-----------|-------------|--------------| | Hex chuck | $45 | $12 (generic) – Poor fit, ball bearings fail quickly | | Carbon brushes | N/A (brushless) | N/A | | Gearbox grease | $18/tube | $6 (moly grease) – Hilti #204 is unique; others cause slippage | | Trigger switch | $70 | $25 (universal) – Requires adapter harness | Hilti Sid 4 A22 Parts Diagram

A: “Not Serviced” or “No Stock.” Hilti expects you to replace a larger assembly. For example, the rotor (10) might be N.S. – you must buy the motor (10+11+12 as a module). If your Sid 4 A22 feels like a

However, even the toughest tools wear down. When your Sid 4 A22 starts losing power, making unusual grinding noises, or simply stops working, the difference between a $300+ replacement and a $50 repair often comes down to one thing: For example, the rotor (10) might be N

A: No. The battery interface (17) is completely different. There is no retrofit part listed. You would need a new tool.

Introduction: Why the Parts Diagram Matters The Hilti Sid 4 A22 is a professional-grade, cordless impact driver known for its brutal torque, compact design, and durability on construction sites. Part of Hilti’s renowned Nuron battery platform (originally introduced on the older A22 platform), this tool is built to drive heavy screws, anchor bolts, and self-tapping fasteners into steel and wood with relentless efficiency.

Unlike brushed drills, the Sid 4 A22’s brushless motor requires the control board (13) to function. If the motor fails, the diagram often shows the rotor and stator as separate items, but Hilti prefers selling a motor + board module due to complex calibration. Section D: Battery Interface & Housing | Diagram Reference | Part Name | Function | Common Issue | |------------------|-----------|----------|---------------| | 15 | Main Housing (Left/Right Clamshell) | Body structure | Broken screw bosses | | 16 | Battery Guide Rails | Locks onto B22 or Nuron battery | Cracked plastic; loose fit | | 17 | Contact Leaf Springs | Power from battery to tool | Corrosion or bent contacts | | 18 | Rubber Overmold (Grip) | Vibration dampening and grip | Peeled off (non-critical but annoying) |