In short
Tipper cylinder overhaul means replacing the full seal kit, polishing (sometimes chroming) the rod, and pressure testing — cheaper and faster than a new cylinder, provided the barrel and rod are neither corroded nor bent. PHS Magnum overhauls telescopic tipper cylinders (Hyva, Meiller, Penta, Binotto, Edbro) working at 200–280 bar.
The tipper cylinder — the most heavily loaded component
The telescopic lifting cylinder is the heart of a tipper. It lifts a dozen or more tonnes of aggregate at 200–280 bar, in mud, dust, and changing temperatures. No surprise it is one of the most frequently repaired assemblies — alongside the cracking body .
Overhaul or replacement — how we decide
After disassembly we assess three things:
- The rod — whether it is straight and free of corrosion pitting. Light marks are polished out; deep corrosion = chroming or replacement.
- The barrel — whether it is oval or dented. Ovalisation means the seal will leak anyway.
- Guides and threads — the condition of the supply port and mountings.
If the barrel and rod are healthy, the overhaul is worthwhile — seal replacement, polishing, assembly, and testing. If not — we honestly recommend replacement.
Overhaul scope
- Removing the cylinder from the trailer (crane up to 10 tonnes on-site)
- Replacing the full set of seals and guide rings
- Polishing the rod (or chroming at a subcontractor)
- Barrel inspection, honing if needed
- Assembly, bleeding the system, pressure and leak test
Typical damage patterns by application
Tipper cylinders wear differently depending on what they carry:
| Payload type | Typical damage pattern |
|---|---|
| Dry aggregate (gravel, crushed stone) | Slow seal wear — predictable, normal lifecycle |
| Wet asphalt, concrete mix | Accelerated rod corrosion from moisture and alkalis |
| Mud, wet soil | Surface indentations on rod from particles entering the guide |
| Quarry operation | Impact shock loads, frequent cracking at mounting points |
This helps decide whether to polish, chrome plate, or replace.
Chrome plating the rod — when and why
When the rod is too deeply pitted to polish, we offer chrome plating at a partner facility. Hard chrome raises surface hardness to 800–1000 HV, extends seal life, and makes the rod resistant to moisture and light abrasives. Cost-wise, chrome plating falls between polishing and buying a new rod — frequently the most economical path when the rest of the cylinder is in good condition.
Hydraulic pressure test after overhaul
Every cylinder overhaul ends with a hydraulic pressure test — the cylinder is held at maximum working pressure (typically 200–280 bar) under static load. Only after a passed test is the cylinder reinstalled. Written test documentation is available on request.
Common associated faults
When a cylinder starts leaking, it is worth checking simultaneously:
- Hydraulic pump — low system pressure can indicate a pump fault rather than a cylinder fault
- Control valve block — internal leaks cause the body to sink slowly with no visible external leak
- Hydraulic fluid — old or contaminated fluid accelerates seal degradation; we recommend changing the oil with every cylinder overhaul
- Hydraulic filter — should be replaced at every hydraulic intervention
The cylinder is part of a system
A cylinder failure often comes together with a fault in the pump, control valve block, or valves — tipper hydraulic systems are frequently Hyva or Meiller equipment. We diagnose the whole system, not just the cylinder, so the repair lasts. For vehicles already at our facility for cylinder work, it makes sense to combine with TDT pressure vessel inspection if the certificate is due — one visit, one downtime.
Leak or a sinking body? Call for a diagnosis: +48 602 716 551 | biuro@magnumchorula.pl
