Expander pins in forestry machinery – applications and advantages

n forestry machinery, such as harvesters and forwards, pin connections are widely used because they enable moving parts to be connected and provide the necessary flexibility and strength.
Their main places of application include:

• Hydraulic roller arms, delimbing knives or crane link
• Harvester head tilt mechanism
• Machine joint
• Control systems, such as the machine’s steering cylinders
• Structural components of a forestry crane

Unfortunately, pin joint wear is a common problem in forestry machinery. Failure to repair them in a timely manner can lead to serious consequences, such as costly downtime, the need for reaming holes or surfacing structural components.
Expander pins prove to be extremely helpful here – their design allows them to be used even when the connections are severely worn.

Advantages of expander pins

Safety and durability: these pins are able to carry much higher loads compared to ordinary pins. Their expandable design increases the holding force due to even pressure distribution.
We offer expander pins made of 40HMT material. This is a tempering steel with significant hardenability. It is characterized by higher strength and wear resistance. In addition, if necessary, these pins are hardened and then ground.
Easy assembly and disassembly: Thanks to their resilient design, they can be assembled without the need for additional safety devices such as nuts or pins, which speeds up maintenance and repairs.
Elimination of backlash: Expander pins minimize backlash during operation, due to the ability to tighten the nut
Protection of mounting holes: The design of expander pins reduces the risk of hole deformation, which is particularly important in repeatedly disassembled connections.

Expander pins are the answer to the challenges posed by heavy-duty forestry machinery. Thanks to their design and high-quality materials, they provide stability, durability and ease of use where precision and reliability are crucial.
Their use minimizes the risk of costly breakdowns and allows operators to focus on efficient work rather than technical problems. In addition, their ability to be used in the event of even significant hole wear makes them an economical and practical choice.