A forklift only performs well when it is equipped for the loads it handles. A standard pallet, a drum, bales, or fragile cartons do not call for the same tool at the end of the mast. Forks and attachments let a single machine adapt to very different loads, but every attachment carries a capacity cost that has to be factored in. This guide walks through the forks themselves, the carriage that holds them, the main attachments, and the safety rule you must never lose sight of: with each configuration, you recheck the residual capacity.
The forks: length, thickness, wear
The forks are the basic tool, and choosing them is not trivial. Length should match the load, without overshooting it: forks that are too long get in the way of maneuvering, risk damaging the next load, and shift the center of gravity. The rule is to choose length to the load you carry, not beyond it.
Fork thickness and condition govern safety. The heel, the most heavily stressed area, wears over time. The rule commonly accepted by safety professionals is to retire a fork once wear reaches roughly 10% of its original thickness: beyond that, capacity falls sharply and the risk of failure rises. A regular check of wear and straightness is part of basic upkeep.
The carriage and ISO classes
Forks mount on a carriage, itself standardized by ISO class according to the truck's capacity. The class sets the height and the mounting type for forks and attachments: any equipment has to be compatible with the machine's carriage class. Fork positioning on the carriage governs load stability: a spread matched to the pallet, forks centered and properly locked on their pins, prevents the load from sliding or sitting askew.
Common attachments
Beyond the forks, a range of attachments lets you handle specific loads.
- Fork positioner. It spreads or closes the forks from the operator's seat, to suit different pallet widths without getting off.
- Side shift. It moves the load left or right for precise placement without repositioning the whole truck.
- Clamps. For loads without a pallet: bale, drum, and carton clamps, which grip the load by squeezing.
- Fork extensions. For long loads, provided you respect the limits of use.
- Jib or crane arm. To handle a load slung from a hook.
Each attachment answers a specific need; the right choice always starts from the real nature of the loads to be handled.
The capacity cost
This is the point most often forgotten. Every attachment adds weight and, above all, moves the load's center of gravity away from the mast. Yet a truck's capacity is defined for a reference load center. As soon as the attachment pushes the load forward, or adds its own mass, the real capacity of the whole assembly drops: this is the residual capacity.
The consequence is simple: you cannot rely on the truck's nominal capacity once an attachment is fitted. You have to consult the load chart for the actual configuration, attachment included, and never exceed the residual capacity shown. A truck able to lift a tonne on bare forks can see its capacity fall noticeably with a clamp and an offset load.
Safety and compatibility
Matching a truck to its loads is a safety matter before it is a productivity matter.
- Rated attachments. Use only equipment intended for the machine and compliant with its carriage class.
- Correct mounting. Forks and attachments locked, hydraulic connections checked, no abnormal play.
- Up-to-date load chart. The machine must carry the capacity information that matches the fitted attachment.
- Respect residual capacity. Recheck the chart at every change of configuration, never from memory.
It is this discipline, more than the machine itself, that ensures safe and lasting handling.
