On a two-wheel drive TLB, what fraction of the machine's weight is typically carried by the backhoe assembly?

On a two-wheel drive tractor-loader-backhoe (TLB), the backhoe assembly plays a crucial role in weight distribution, particularly during operation. Typically, the backhoe assembly carries about one-third of the machine’s weight. This distribution is vital for the stability and balance of the TLB while performing tasks such as digging or lifting. The weight carried by the backhoe helps to counterbalance the front loader, ensuring that the machine remains stable and secure during operation, especially when the backhoe is extended or in use.

When considering the other fractions, they do not align with the standard engineering principles and weight distribution observed in TLB designs. For example, one-quarter and one-half imply different load distributions that would not maintain optimal balance or stability. The fraction of two-thirds would significantly shift the center of gravity, which would likely compromise the machine's operation and safety. Hence, the correct answer reflects the engineering design intended to optimize performance and ensure stability during various tasks.