Working of Tractor
Post Hole Digger
General Working
Post hole digger machine is used for digging round hole especially inserting electric post. Digging a hole by using pickaxe or any other digging tool consumes a lot of man power and time.in post hole digger machine, digging blades are attached to the end of the machine. By using this blades we can simply make hole without any manpower and less time. These blades are mantled on a main shaft and shaft is directly connected with power take off shaft of the tractor may or may not be with guarded shaft coupling to get the input power.
Blades
The most important parts of the post hole digger machine are its blades. The diameter and the depth of the hole can be varied by putting different blades. Mainly the blades have a swirl structure which have an advantage for making holes easily.
Three point hitch
The three-point hitch most often refers to the way ploughs and other implements are attached to an agricultural tractor. The three points resemble either a triangle, or the letter A. Three point attachments are the simplest and the only statically determinate way of joining two bodies in engineering. A three point hitch attaches the implement to the tractor so that the orientation of the implement is fixed with respect to the tractor and the arm position of the hitch. The tractor carries some or all of the weight of the implement. The other main mechanism for attaching a load is through a drawbar, a single point, pivoting attachment where the implement or trailer is not in a fixed position with respect to the tractor.
Connecting rod
Connecting rod is a connecting element, which is connected between the guarded shaft and the bevel gear. This connecting rod is mainly made of cast iron. One end of the connecting rod have spline shape structure and other end have a hollow cylindrical shape. The bevel gear is connected to the hollow cylindrical end by using pin.
ASSEMBLY
1. Attach the main support beam to the top link of the 3 point linkage of the tractor.
2. Connect the “A” frame to the two lower link arms of the tractor.
3. Position and connect the top part of the “A” frame to the hole CLOSEST TO THE AUGER .
4. Test the hydraulic linkage of the tractor by raising and lowering the jib.
5. Position the jib at a convenient height and attach the gearbox (without the auger attached) to the jib by aligning the holes and inserting the pin. A small amount of lubricating grease, and correct alignment, will enable the pin to be fitted without difficulty.
6. Fit the Slip clutch to the input shaft of the gear box. Tighten bolts to the tension specified by manufacturers’ specifications. Check the length of the drive shaft by separating the 2 sections of the telescopic drive shaft. Attach each section onto the tractor PTO output and gearbox. Hold both sections in the middle - parallel and together. Lower the jib to maximum operating depth, and mark the overlap of the inner and outer tube of the drive shaft. Repeat the process to measure maximum lifting height. The drive shaft may, need to be cut to length if there is insufficient distance between the yokes when the drive shaft is fully closed. Similarly, the drive shaft cover may also need to be shortened, by cutting to the suitable length with a hacksaw. This operation will determine the correct length of the drive shaft before operation.
7. Connect the auger to the output shaft of the gearbox with bolts provided. Tighten nuts securely. Again, a small amount of lubricating grease will assist in fitting the bolts through the holes.
8. Connect the drive shaft to the gearbox and lock. Fit the other end to the tractor’s PTO output and lock. In all cases, use a small amount of lubricating grease to protect the output spines.
9. Carefully raise and lower the linkage to be sure that the correct ground clearance can be obtained.
Transporting the Post Hole Digger
With the post hole digger in a raised position, disconnect the drive shaft from the Tractor PTO. Secure the drive shaft in a parallel position to the jib, by using the chain provided. In doing so, ensure that the yoke of the drive shaft, at the point that it connects to the gearbox, is at right angles (90 deg.) to the drive shaft. In this way, the drive shaft will locate directly under, and parallel to, the jib. Lower the jib carefully until the auger rests on the ground, Slowly reverse the tractor, with the linkage in the down position, until the linkage is fully lowered and the auger and jib are in a parallel position. Secure the auger to the jib. The post hole digger may then be transported.
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