Telescopic Cylinders
Multi-stage cylinders that reach a long stroke from a short closed length, used on tipper bodies, skip gear and platform lifts where there is no room for a single-stage ram.
Features
- Stages extend in sequence from largest to smallest, so force falls and speed rises as each stage takes over. A body that stalls part-way through the tip is usually a stage pressure question.
- Closed length is the governing dimension under a tipping body, and it is fixed by stage count rather than by chosen stroke.
- Front-mount, under-body and double-acting arrangements are not interchangeable, and each has its own trunnion and pin geometry.
- Seal replacement means stripping stages in order, which is why a workshop rebuild is usually more economical than a roadside attempt.
- Overloading a partly extended telescopic cylinder sideways bends the smallest stage first, and a bent stage cannot be rebuilt.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Stages | 3 | links closed length to extended reach | |
| Closed length | 1 450 | mm | the dimension that has to fit the chassis |
| Extended length | 3 900 | mm | sets the tipping angle achieved |
| First-stage bore | 146 | mm | governs initial breakout force at the start of the tip |
| Working pressure | 190 | bar | compared with the tipping valve relief setting |