| Step | Action | |------|--------| | 1 | Compare new shock’s extended length to old one – must be identical ±2mm. | | 2 | Check mounting bushings for wear. Replace if cracked or oval. | | 3 | Tighten mounting bolts to manufacturer spec (typically 40–60 Nm for M12 bolts). Do not overtighten – this flattens bushings. | | 4 | If a metal washer or spacer is present, reinstall it exactly as removed. | | 5 | Final check: After installation, the shock should not bottom out or top out through full suspension travel. |
Use this section ONLY if you cannot find the original. It follows ISO and ANSI standards for hydraulic shock absorbers. Br 3021 Shock Manual --
| Mounting style | Diagram reference | Load distribution | Best for | |----------------|------------------|------------------|------------| | Base-mounted, 4 points | Br 3021- Fig A | Even on flat base | Low CG equipment | | Side-mounted, 6 points | Br 3021- Fig B | Shear load primary | Tall cabinets | | Overhung (wall) | Br 3021- Fig C | Tension/compression mix | Space-constrained areas | | Step | Action | |------|--------| | 1
| Parameter | Common Value Range for a “3021” Class Shock | | --- | --- | | | Hydraulic monotube or nitrogen-charged | | Extended Length | 18–22 inches (457–559 mm) | | Compressed Length | 13–15 inches (330–381 mm) | | Stroke | 5–7 inches (127–178 mm) | | Mounting Type | Eyelet (12mm or 1/2″) or stud top / eye bottom | | Damping Force | Linear or progressive, 1800–2500 N | | Max Pressure | 150–200 PSI (if gas-charged) | | Temperature Range | -20°C to +80°C | | | 3 | Tighten mounting bolts to
The manual defines "Sag" as the amount the shock compresses under the rider's weight in a static, seated position.