What determines the angle of the machine and the loader bucket?

The angle of the machine and the loader bucket primarily depends on the angle of the ground under the rear tires. This is because the rear tires are critical in establishing a stable pivot point for the machine. When the rear tires are positioned on uneven ground, it affects the overall stance and alignment of the tractor-loader-backhoe, leading to variations in the bucket angle.

The stability of the machine is crucial during operations such as loading and digging, as it influences how effectively the bucket can function. Additionally, variations in the terrain beneath the rear tires change the machine's center of gravity, which directly impacts how the bucket articulates and performs its tasks.

The ground under the front tires plays a role in overall stability and the load the front end can handle, but the rear tires are more significant when considering the angle adjustments of the loader bucket. While hydraulic pressure and bucket height are important factors in operation, they do not determine the angle of the machine and the bucket in relation to the ground.