tractor<\/a>. The Control panel interprets the signal from the receiver and opens or closes the hydraulic control valve. Loose soil particles are picked up by the bucket and released lower in the field.<\/p>\n\n\n\n4\u2010wheel tractor<\/h4>\n\n\n\n
A 4\u2010WD tractor is required to drag the leveling bucket. The power of the tractor could be varied from 30\u2010500 hp depending on the agricultural field sizes. <\/p>\n\n\n\n
4WD drive with power shift transmission is preferable for this operation.<\/p>\n\n\n\n
Drag bucket <\/h4>\n\n\n\n
Bucket used for leveling can be either 3\u2010 point linkage mounted or pulled by the tractor\u2019s drawbar. <\/p>\n\n\n\n
Pull type systems are easy to operate as it is easier to connect the tractor\u2019s hydraulic system to an external hydraulic ram, so pull-type systems are most preferable for this operation<\/p>\n\n\n\n
Laser transmitter <\/h4>\n\n\n\n
The laser transmitter rest on a tripod. It allows the laser beam to sweep above the tractor unobstructed. Several tractors can work with one transmitter.<\/p>\n\n\n\n
Laser receiver <\/h4>\n\n\n\n
It detects the position of the laser reference plane. Then it transmits these signals to the control box. The receiver rest on a mast attached to the drag bucket.<\/p>\n\n\n\n
Control panel <\/h4>\n\n\n\n
The main control box accepts then processes signals from the machine\u2010mounted receiver. It indicates the drag bucket\u2019s position relative to the finished grade.<\/p>\n\n\n\n
Hydraulic control system<\/h4>\n\n\n\n
This system supplies oil to raise and lower the leveling bucket. The main function of the pressure relief valve in the system is to return the excess oil to the tractor reservoir. <\/p>\n\n\n\n
If the relief valve is not large enough or it malfunctions, damage, in that case, can be caused to the tractor\u2019s hydraulic pump.<\/p>\n\n\n\n
Different Types of Laser Levelers <\/h3>\n\n\n\n
Manual leveling lasers \u2010 In this type of setup of a laser leveling instrument requires the operator to manually level the unit by using the units\u2019 screws and bubble vials. These lasers can achieve maximum accuracy of 1 cm at 100m. <\/p>\n\n\n\n
Semi self\u2010leveling lasers<\/h4>\n\n\n\n
These types of lasers adjust themselves automatically within a range. They can achieve an accuracy of at least 1 cm at 100 m. They are equipped with a circular bubble with a bull\u2019s eye or electronic lights that turn green when you reach the self\u2010leveling
range.<\/p>\n\n\n\n
Fully self\u2010leveling lasers<\/h4>\n\n\n\n
These types of lasers automatically find and maintain the level within a specified range. They are the easiest to use. They can achieve an accuracy of up to 2.5 mm at 100 m.<\/p>\n\n\n\n
Split\u2010beam lasers<\/h4>\n\n\n\n
These types of lasers emit simultaneous horizontal and vertical beams to establish both level and plumb reference lines.<\/p>\n\n\n\n