BTB 38: Boom Proximity Sensors for 234 Loader

When it’s time to move the loader to a new landing the grapple is usually hooked onto the heel to prepare the loader for transportation.
Boom proximity sensors are especially important when fully extending both the hoist and stick cylinders to tuck the grapple close to the stick boom to prepare for transportation.

Boom proximity sensors are especially important when fully extending both the hoist and stick cylinders to tuck the grapple close to the stick boom to prepare for transportation.

This is done by fully extending both the hoist and stick cylinders with the grapple open. As the grapple falls around the heel it is closed to tuck the grapple close to the stick boom. This position with the boom extended straight in the air is one of the most dangerous for the loader since it creates a very high centre of gravity. Care must be taken during this operation to prevent the cylinders from hitting the end of stroke at full speed.

A relatively new feature on the Tigercat 234 loader are boom proximity sensors that slow the cylinders down before they reach the end of stroke, essentially acting like a cushion. This is important to prevent damage not only to the cylinder, but also to the pins, bushings, and structures as well. Machines that are pilot joystick controlled cannot take advantage of the boom proximity sensors since an electric signal is needed to adjust the flow to the cylinder. For these machines, it is important for the operator to slow the cylinders down before hitting the end of stroke, since repeated pounding on the cylinder will result in expensive damage.