Zusammenfassung
Maintenance and repairs on telehandlers are routine – but dangerous if performed without proper safety precautions. Especially when working under the lifting cylinder, only one reliable protection is available: the mechanical cylinder lock. In this article, you'll learn why it's essential, how to install it correctly, and what you absolutely need to pay attention to.
Why cylinder security is vital
The lifting cylinder of your telehandler holds loads weighing tons – normally reliably thanks to hydraulic pressure. But this pressure can fail. A leak, a defective valve, or a gradual leak is all it takes.
Without a cylinder safety device, the boom could lower suddenly and uncontrollably – with life-threatening consequences for everyone working underneath.
The mechanical cylinder lock – usually the "conspicuous yellow part" on your telehandler – mechanically locks the cylinder. After installation, it prevents the telescopic arm from lowering, even in the event of a complete hydraulic failure.
In short: The mechanical cylinder safety device is your last safety line under the lifting cylinder.
When mechanical support must be used
Whenever you carry out maintenance, inspection or repair work under the extended lifting cylinder , this safety device must be used - e.g. when:
- Maintenance of hydraulic lines
- Replacing seals or bolts
- Repairs to the boom mechanism
- Checking or changing limit switches
Important:
Even for short interventions and small jobs, the following applies: Never work under an unsecured cylinder.
How to correctly install the cylinder safety support
The correct installation of this safety support is quick and easy – and reliably secures your work:
- Parking the telehandler: Apply the handbrake, switch off the engine, check the surface.
- Remove the support: This is usually clearly visible on the vehicle frame or in a holder.
- Raise the boom slightly: Only far enough to allow the protection to be inserted safely.
- Insert or screw on the support: Depending on the model, it is positioned and fixed between the piston rod and the cylinder.
- Check fit: Make sure the guard is securely in place and the cylinder cannot sink.
You may only begin work once the mechanical support has been correctly installed. 
Mechanical cylinder lock on the telehandler: The lock remains attached to the device as long as no work is being carried out under the boom. Before maintenance or repairs, it is removed and mounted on the lift cylinder to mechanically secure the boom against lowering.
Common backup mistakes – and how to avoid them
Despite clear guidelines, the same mistakes happen again and again in everyday life:
- No safety equipment used: Working under the boom “just for a short time” without safety equipment is life-threatening.
- Improper installation: Fuse not correctly fixed or only loosely inserted.
- Wrong surface: Device is tilted or sinks, protection loses its effectiveness.
- Forgetting the safety bar during work interruptions: Always check again after breaks or changes of location.
Our tip: Develop a fixed routine: Before every intervention under the cylinder – insert the safety device, check the safety device, and only then work.
Conclusion: Small measure, big impact
A correctly installed safety device reliably secures your work and protects you from the serious consequences of a hydraulic failure.
Anyone who works under the lifting cylinder of a telehandler without using the protection risks their life.
Don’t rely on technology alone – always take additional mechanical precautions.
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